/* ============================================================
   CODEBHAVYA — WEB TECHNOLOGIES
   Level 01 Stylesheet
   ============================================================ */

:root {
    --wt-bg: #15191d;
    --wt-bg-soft: #1b2025;

    --wt-panel: #20262c;
    --wt-panel-2: #252c33;
    --wt-panel-3: #101418;

    --wt-border: #343c45;
    --wt-border-soft: #2b3239;

    --wt-text: #eef2f5;
    --wt-text-soft: #c3cbd3;
    --wt-text-muted: #89939e;

    --wt-gold: #efc65b;
    --wt-gold-soft: #f7d77d;

    --wt-cyan: #65cbd2;
    --wt-cyan-soft: #82dce1;

    --wt-green: #67c596;
    --wt-red: #e8786d;
    --wt-orange: #e6a75b;

    --wt-shadow: 0 16px 38px rgba(0, 0, 0, 0.24);

    --wt-radius: 16px;
    --wt-radius-small: 10px;

    --wt-content-width: 1180px;
}


/* ============================================================
   BASE
   ============================================================ */

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at top right, rgba(101, 203, 210, 0.06), transparent 28%),
        radial-gradient(circle at top left, rgba(239, 198, 91, 0.04), transparent 28%),
        var(--wt-bg);

    color: var(--wt-text);

    font-family:
        Inter,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    line-height: 1.7;
}

body,
button,
input,
textarea,
select {
    font-family: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button {
    border: 0;
}

a {
    color: inherit;
}


/* ============================================================
   READING PROGRESS
   ============================================================ */

.reading-progress-wrap {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;

    z-index: 9998;

    height: 4px;

    background: rgba(255, 255, 255, 0.04);

    pointer-events: none;
}

.reading-progress {
    height: 100%;
    width: 0;

    background:
        linear-gradient(
            90deg,
            var(--wt-gold),
            var(--wt-cyan)
        );

    transition: width 0.08s linear;
}


/* ============================================================
   MAIN PAGE
   ============================================================ */

.wt-page {
    width: min(
        calc(100% - 32px),
        var(--wt-content-width)
    );

    margin: 0 auto;

    padding:
        34px
        0
        70px;
}


/* ============================================================
   HERO
   ============================================================ */

.wt-hero {
    position: relative;

    padding:
        34px
        34px
        38px;

    margin-bottom: 30px;

    border: 1px solid var(--wt-border);

    border-radius: 22px;

    background:
        linear-gradient(
            145deg,
            rgba(101, 203, 210, 0.06),
            transparent 45%
        ),
        linear-gradient(
            145deg,
            #20262b,
            #171b1f
        );

    box-shadow: var(--wt-shadow);

    overflow: hidden;
}

.wt-hero::after {
    content: "";

    position: absolute;

    width: 240px;
    height: 240px;

    right: -90px;
    top: -100px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(239, 198, 91, 0.08),
            transparent 70%
        );

    pointer-events: none;
}

.wt-breadcrumb {
    display: flex;
    align-items: center;
    gap: 9px;

    color: var(--wt-text-muted);

    font-size: 0.9rem;

    margin-bottom: 18px;
}

.wt-breadcrumb a {
    color: var(--wt-cyan);
    text-decoration: none;
}

.wt-breadcrumb a:hover {
    color: var(--wt-cyan-soft);
}

.level-badge {
    display: inline-flex;
    align-items: center;

    padding: 7px 12px;

    border: 1px solid rgba(239, 198, 91, 0.32);

    border-radius: 999px;

    background: rgba(239, 198, 91, 0.08);

    color: var(--wt-gold-soft);

    font-size: 0.77rem;
    font-weight: 800;

    letter-spacing: 0.07em;
}

.wt-hero h1 {
    position: relative;
    z-index: 1;

    margin:
        17px
        0
        12px;

    color: #ffffff;

    font-size:
        clamp(
            2rem,
            4vw,
            3.2rem
        );

    line-height: 1.14;

    letter-spacing: -0.025em;
}

.hero-subtitle {
    max-width: 850px;

    margin: 0;

    color: var(--wt-text-soft);

    font-size: 1.08rem;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;

    gap: 10px;

    margin-top: 22px;
}

.hero-meta span {
    display: inline-flex;
    align-items: center;

    min-height: 34px;

    padding: 0 12px;

    border:
        1px solid var(--wt-border-soft);

    border-radius: 999px;

    background: rgba(255, 255, 255, 0.025);

    color: var(--wt-text-soft);

    font-size: 0.84rem;
}


/* ============================================================
   SECTIONS
   ============================================================ */

.content-section {
    margin:
        0
        0
        34px;
}

.section-heading {
    display: flex;
    align-items: flex-start;

    gap: 14px;

    margin-bottom: 19px;
}

.section-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-width: 38px;
    height: 38px;

    border-radius: 11px;

    background: rgba(239, 198, 91, 0.09);

    border:
        1px solid rgba(239, 198, 91, 0.25);

    color: var(--wt-gold-soft);

    font-size: 0.82rem;
    font-weight: 800;
}

.section-heading h2 {
    margin: 0 0 3px;

    color: #ffffff;

    font-size: 1.65rem;
    line-height: 1.25;
}

.section-heading p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.95rem;
}


/* ============================================================
   OBJECTIVES
   ============================================================ */

.objective-grid {
    display: grid;

    grid-template-columns:
        repeat(
            3,
            minmax(0, 1fr)
        );

    gap: 14px;
}

.info-card {
    padding: 21px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    transition:
        transform 0.18s ease,
        border-color 0.18s ease;

    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.14);
}

.info-card:hover {
    transform: translateY(-3px);

    border-color:
        rgba(101, 203, 210, 0.35);
}

.card-icon {
    font-size: 1.55rem;
    margin-bottom: 10px;
}

.info-card h3 {
    margin:
        0
        0
        7px;

    font-size: 1.05rem;

    color: #ffffff;
}

.info-card p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.91rem;
}


/* ============================================================
   ARTICLE CARD
   ============================================================ */

.article-card {
    padding: 24px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        linear-gradient(
            145deg,
            #21272d,
            #1b2025
        );

    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.13);
}

.article-card p {
    margin:
        0
        0
        16px;

    color: var(--wt-text-soft);

    font-size: 1rem;
}

.article-card p:last-child {
    margin-bottom: 0;
}

.article-card strong {
    color: #ffffff;
}


/* ============================================================
   HIGHLIGHT / NOTE BOX
   ============================================================ */

.highlight-box,
.note-box,
.memory-box {
    display: flex;
    align-items: flex-start;

    gap: 13px;

    margin-top: 20px;

    padding: 17px 18px;

    border:
        1px solid rgba(101, 203, 210, 0.2);

    border-radius:
        var(--wt-radius-small);

    background:
        rgba(101, 203, 210, 0.055);
}

.highlight-icon {
    font-size: 1.4rem;
}

.highlight-box strong,
.note-box strong,
.memory-box strong {
    color: var(--wt-cyan-soft);
}

.highlight-box p {
    margin-top: 5px;
}

.note-box {
    color: var(--wt-text-soft);
}

.memory-box {
    align-items: center;

    border-color:
        rgba(239, 198, 91, 0.22);

    background:
        rgba(239, 198, 91, 0.055);

    color: var(--wt-text-soft);
}

.memory-box strong {
    color: var(--wt-gold-soft);
    white-space: nowrap;
}


/* ============================================================
   COMPARISON
   ============================================================ */

.comparison-grid {
    position: relative;

    display: grid;

    /* Normal comparison cards: two balanced columns. */
    grid-template-columns: repeat(2, minmax(0, 1fr));

    align-items: stretch;

    gap: 12px;

    width: 100%;
    min-width: 0;
}

/* A real VS/+ comparison keeps its dedicated middle badge column. */
.comparison-grid:has(> .vs-badge) {
    grid-template-columns: minmax(0, 1fr) 70px minmax(0, 1fr);
}

/* Three-card comparison blocks use three equal columns. */
.comparison-grid:has(> .comparison-card:nth-child(3):last-child) {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Four-card blocks use a clean 2 × 2 arrangement. */
.comparison-grid:has(> .comparison-card:nth-child(4):last-child) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.comparison-grid > * {
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
}

.comparison-card {
    padding: 23px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );
}

.internet-card {
    border-color:
        rgba(101, 203, 210, 0.18);
}

.web-card {
    border-color:
        rgba(239, 198, 91, 0.18);
}

.comparison-top {
    display: flex;
    align-items: center;

    gap: 12px;

    margin-bottom: 11px;
}

.comparison-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 42px;
    height: 42px;

    border-radius: 12px;

    background: rgba(255, 255, 255, 0.045);

    font-size: 1.3rem;
}

.comparison-card h3 {
    margin: 0;

    font-size: 1.18rem;
}

.comparison-card > p {
    color: var(--wt-text-soft);

    margin:
        0
        0
        15px;
}

.concept-list {
    display: grid;

    gap: 8px;

    color: var(--wt-text-muted);

    font-size: 0.9rem;
}

.vs-badge {
    display: flex;
    align-items: center;
    justify-content: center;

    align-self: center;

    width: 42px;
    height: 42px;

    margin: auto;

    border-radius: 50%;

    border:
        1px solid var(--wt-border);

    background: var(--wt-panel-3);

    color: var(--wt-gold);

    font-size: 0.76rem;
    font-weight: 800;
}


/* ============================================================
   COMPARISON TABLE
   ============================================================ */

.comparison-table-wrap {
    overflow-x: auto;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background: var(--wt-panel);
}

.comparison-table {
    width: 100%;

    border-collapse: collapse;

    min-width: 680px;
}

.comparison-table th,
.comparison-table td {
    padding:
        14px
        15px;

    text-align: left;

    border-bottom:
        1px solid var(--wt-border-soft);

    font-size: 0.91rem;
}

.comparison-table th {
    background: var(--wt-panel-3);

    color: var(--wt-gold-soft);

    font-size: 0.84rem;

    text-transform: uppercase;

    letter-spacing: 0.04em;
}

.comparison-table td {
    color: var(--wt-text-soft);
}

.comparison-table tr:last-child td {
    border-bottom: 0;
}


/* ============================================================
   ARCHITECTURE
   ============================================================ */

.architecture-grid {
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 16px;
}

.architecture-card {
    padding: 23px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        linear-gradient(
            145deg,
            #22282e,
            #191e22
        );
}

.architecture-label {
    display: inline-flex;

    padding:
        5px
        9px;

    border-radius: 999px;

    background:
        rgba(101, 203, 210, 0.08);

    border:
        1px solid rgba(101, 203, 210, 0.2);

    color: var(--wt-cyan);

    font-size: 0.72rem;
    font-weight: 800;

    letter-spacing: 0.06em;
}

.dynamic-label {
    background:
        rgba(239, 198, 91, 0.08);

    border-color:
        rgba(239, 198, 91, 0.2);

    color: var(--wt-gold-soft);
}

.architecture-card h3 {
    margin:
        13px
        0
        15px;

    font-size: 1.2rem;
}

.flow-mini {
    display: grid;

    gap: 7px;

    margin-bottom: 15px;
}

.flow-node {
    padding:
        9px
        12px;

    border:
        1px solid var(--wt-border);

    border-radius: 9px;

    background: var(--wt-panel-3);

    color: var(--wt-text-soft);

    text-align: center;

    font-size: 0.84rem;
}

.accent-node {
    color: var(--wt-cyan-soft);

    border-color:
        rgba(101, 203, 210, 0.2);
}

.flow-arrow {
    color: var(--wt-text-muted);

    text-align: center;
}

.architecture-card > p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.9rem;
}


/* ============================================================
   CLIENT / SERVER
   ============================================================ */

.client-server-layout {
    display: grid;

    grid-template-columns:
        minmax(0, 1fr)
        90px
        minmax(0, 1fr);

    align-items: center;

    gap: 14px;
}

.side-panel {
    padding: 24px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );
}

.client-panel {
    border-color:
        rgba(101, 203, 210, 0.2);
}

.server-panel {
    border-color:
        rgba(239, 198, 91, 0.2);
}

.side-title {
    display: flex;
    align-items: center;

    gap: 12px;

    margin-bottom: 16px;
}

.side-title > span:first-child {
    font-size: 1.55rem;
}

.small-label {
    display: block;

    margin-bottom: 2px;

    color: var(--wt-text-muted);

    font-size: 0.68rem;
    font-weight: 800;

    letter-spacing: 0.06em;
}

.side-title h3 {
    margin: 0;

    color: #ffffff;

    font-size: 1.18rem;
}

.technology-tag-list {
    display: flex;
    flex-wrap: wrap;

    gap: 8px;

    margin-bottom: 16px;
}

.technology-tag-list span {
    padding:
        6px
        9px;

    border-radius: 8px;

    background:
        rgba(255, 255, 255, 0.04);

    border:
        1px solid var(--wt-border-soft);

    color: var(--wt-text-soft);

    font-size: 0.78rem;
    font-weight: 700;
}

.side-panel p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.9rem;
}

.connection-arrow {
    display: grid;

    justify-items: center;

    gap: 9px;
}

.arrow-line {
    width: 2px;
    min-height: 34px;

    background:
        linear-gradient(
            to bottom,
            transparent,
            var(--wt-cyan),
            transparent
        );
}

.arrow-label {
    padding:
        5px
        8px;

    border-radius: 7px;

    background: var(--wt-panel-3);

    border:
        1px solid var(--wt-border);

    color: var(--wt-gold-soft);

    font-size: 0.67rem;
    font-weight: 800;

    white-space: nowrap;
}


/* ============================================================
   DATABASE FLOW
   ============================================================ */

.database-flow {
    display: flex;
    align-items: center;

    gap: 10px;

    overflow-x: auto;

    padding:
        4px
        3px
        17px;
}

.db-node {
    flex:
        1
        1
        170px;

    min-width: 150px;

    padding:
        19px
        15px;

    text-align: center;

    border:
        1px solid var(--wt-border);

    border-radius: 14px;

    background: var(--wt-panel);

    box-shadow:
        0 8px 20px rgba(0, 0, 0, 0.12);
}

.active-db {
    border-color:
        rgba(239, 198, 91, 0.28);

    background:
        linear-gradient(
            145deg,
            rgba(239, 198, 91, 0.08),
            var(--wt-panel)
        );
}

.db-icon {
    display: block;

    margin-bottom: 7px;

    font-size: 1.4rem;
}

.db-node strong {
    display: block;

    color: #ffffff;

    font-size: 0.95rem;
}

.db-node small {
    display: block;

    margin-top: 3px;

    color: var(--wt-text-muted);

    font-size: 0.72rem;
}

.db-connector {
    color: var(--wt-cyan);

    font-size: 1.25rem;
    font-weight: 800;
}


/* ============================================================
   STACK MAP
   ============================================================ */

.stack-map {
    width: min(
        760px,
        100%
    );

    margin: 0 auto;

    display: grid;

    gap: 8px;
}

.stack-layer {
    display: flex;
    align-items: center;

    gap: 14px;

    padding:
        15px
        17px;

    border:
        1px solid var(--wt-border);

    border-radius: 13px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );
}

.stack-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 33px;
    height: 33px;

    border-radius: 9px;

    background: rgba(255, 255, 255, 0.05);

    color: var(--wt-gold-soft);

    font-size: 0.75rem;
    font-weight: 800;
}

.stack-layer strong {
    display: block;

    color: #ffffff;

    font-size: 0.96rem;
}

.stack-layer small {
    display: block;

    color: var(--wt-text-muted);

    font-size: 0.78rem;
}

.layer-frontend {
    border-color:
        rgba(101, 203, 210, 0.24);
}

.layer-server {
    border-color:
        rgba(239, 198, 91, 0.23);
}

.layer-data {
    border-color:
        rgba(103, 197, 150, 0.22);
}

.stack-arrow {
    text-align: center;

    color: var(--wt-text-muted);

    font-size: 1.15rem;
}


/* ============================================================
   SCENARIO
   ============================================================ */

.scenario-card {
    padding: 19px 21px;

    border:
        1px solid rgba(101, 203, 210, 0.18);

    border-radius: 14px;

    background:
        rgba(101, 203, 210, 0.045);
}

.scenario-question {
    color: #ffffff;

    font-size: 1rem;
    font-weight: 700;
}

.scenario-question code {
    padding:
        2px
        7px;

    border-radius: 6px;

    background: var(--wt-panel-3);

    color: var(--wt-cyan-soft);

    font-size: 0.9rem;
}

.scenario-answer {
    margin-top: 11px;

    color: var(--wt-text-muted);

    font-size: 0.91rem;
}


/* ============================================================
   VISUALIZER
   ============================================================ */

.visualizer-section {
    margin-top: 44px;
}

.visualizer-shell {
    overflow: hidden;

    border:
        1px solid var(--wt-border);

    border-radius: 18px;

    background:
        linear-gradient(
            160deg,
            #14191d,
            #0e1215
        );

    box-shadow:
        0 20px 46px rgba(0, 0, 0, 0.28);
}

.visualizer-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 14px;

    padding:
        13px
        16px;

    border-bottom:
        1px solid var(--wt-border);

    background:
        rgba(255, 255, 255, 0.025);
}

.visualizer-title {
    display: flex;
    align-items: center;

    gap: 9px;

    color: var(--wt-text-soft);

    font-size: 0.75rem;
    font-weight: 800;

    letter-spacing: 0.07em;
}

.pulse-dot {
    width: 8px;
    height: 8px;

    border-radius: 50%;

    background: var(--wt-green);

    box-shadow:
        0 0 0 5px rgba(103, 197, 150, 0.08);
}

.visualizer-status {
    color: var(--wt-text-muted);

    font-size: 0.76rem;
}

.trace-progress {
    height: 4px;

    background: rgba(255, 255, 255, 0.04);
}

.trace-progress-bar {
    width: 12.5%;
    height: 100%;

    background:
        linear-gradient(
            90deg,
            var(--wt-gold),
            var(--wt-cyan)
        );

    transition: width 0.3s ease;
}

.trace-main {
    padding: 28px 22px 22px;
}

.trace-stage {
    min-height: 225px;

    display: flex;
    flex-direction: column;

    justify-content: center;
    align-items: center;

    text-align: center;

    padding:
        20px;

    border:
        1px solid var(--wt-border);

    border-radius: 16px;

    background:
        radial-gradient(
            circle at center,
            rgba(101, 203, 210, 0.055),
            transparent 50%
        ),
        var(--wt-panel-3);

    transition:
        opacity 0.18s ease,
        transform 0.18s ease;
}

.trace-icon {
    margin-bottom: 7px;

    font-size: 2.3rem;
}

.trace-step-number {
    margin-bottom: 7px;

    color: var(--wt-gold);

    font-size: 0.72rem;
    font-weight: 800;

    letter-spacing: 0.09em;
}

.trace-stage h3 {
    margin:
        0
        0
        7px;

    color: #ffffff;

    font-size: 1.32rem;
}

.trace-stage p {
    max-width: 640px;

    margin:
        0
        auto
        14px;

    color: var(--wt-text-muted);

    font-size: 0.9rem;
}

.trace-code {
    max-width: 90%;

    padding:
        9px
        12px;

    overflow-x: auto;

    border:
        1px solid var(--wt-border);

    border-radius: 8px;

    background: #0a0e11;

    color: var(--wt-cyan-soft);

    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        Consolas,
        monospace;

    font-size: 0.8rem;
}

.trace-timeline {
    display: grid;

    grid-template-columns:
        repeat(
            8,
            minmax(70px, 1fr)
        );

    gap: 6px;

    margin-top: 19px;

    overflow-x: auto;
}

.trace-point {
    min-width: 72px;

    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 6px;

    padding:
        7px
        5px;

    background: transparent;

    color: var(--wt-text-muted);

    cursor: pointer;

    border-radius: 8px;

    transition:
        background 0.18s ease,
        color 0.18s ease;
}

.trace-point span {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 27px;
    height: 27px;

    border-radius: 50%;

    border:
        1px solid var(--wt-border);

    background: var(--wt-panel-3);

    font-size: 0.68rem;
    font-weight: 800;
}

.trace-point strong {
    font-size: 0.68rem;
    font-weight: 700;
}

.trace-point:hover {
    background:
        rgba(255, 255, 255, 0.03);

    color: var(--wt-text-soft);
}

.trace-point.active {
    color: var(--wt-cyan-soft);
}

.trace-point.active span {
    border-color:
        rgba(101, 203, 210, 0.55);

    background:
        rgba(101, 203, 210, 0.09);

    color: var(--wt-cyan-soft);

    box-shadow:
        0 0 0 4px rgba(101, 203, 210, 0.05);
}

.trace-controls {
    display: flex;
    justify-content: center;

    gap: 9px;

    padding:
        16px;

    border-top:
        1px solid var(--wt-border);

    background:
        rgba(255, 255, 255, 0.018);
}

.trace-btn {
    min-height: 39px;

    padding:
        0
        15px;

    border-radius: 9px;

    cursor: pointer;

    font-size: 0.82rem;
    font-weight: 800;

    transition:
        transform 0.15s ease,
        opacity 0.15s ease;
}

.trace-btn:hover:not(:disabled) {
    transform: translateY(-1px);
}

.trace-btn:disabled {
    opacity: 0.4;

    cursor: not-allowed;
}

.trace-btn.primary {
    background: var(--wt-gold);

    color: #17191c;
}

.trace-btn.secondary {
    background: var(--wt-panel-2);

    border:
        1px solid var(--wt-border);

    color: var(--wt-text-soft);
}

.trace-explanation {
    margin-top: 15px;

    padding: 21px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background: var(--wt-panel);
}

.trace-explanation h3 {
    margin:
        0
        0
        16px;

    font-size: 1rem;
}

.explanation-grid {
    display: grid;

    grid-template-columns:
        repeat(
            3,
            minmax(0, 1fr)
        );

    gap: 12px;
}

.explanation-grid > div {
    display: flex;
    align-items: flex-start;

    gap: 10px;

    color: var(--wt-text-muted);

    font-size: 0.86rem;
}

.explanation-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    width: 27px;
    height: 27px;

    border-radius: 50%;

    background:
        rgba(239, 198, 91, 0.08);

    border:
        1px solid rgba(239, 198, 91, 0.18);

    color: var(--wt-gold);

    font-size: 0.65rem;
    font-weight: 800;
}

.explanation-grid p {
    margin: 0;
}


/* ============================================================
   TECHNOLOGY GRID
   ============================================================ */

.technology-grid {
    display: grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap: 13px;
}

.technology-card {
    padding: 19px;

    border:
        1px solid var(--wt-border);

    border-radius: 14px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    transition:
        transform 0.18s ease,
        border-color 0.18s ease;
}

.technology-card:hover {
    transform: translateY(-3px);

    border-color:
        rgba(239, 198, 91, 0.28);
}

.technology-icon {
    font-size: 1.55rem;

    margin-bottom: 8px;
}

.technology-card h3 {
    margin:
        0
        0
        6px;

    color: #ffffff;

    font-size: 1rem;
}

.technology-card p {
    min-height: 72px;

    margin:
        0
        0
        13px;

    color: var(--wt-text-muted);

    font-size: 0.83rem;
}

.technology-role {
    display: inline-flex;

    padding:
        5px
        8px;

    border-radius: 6px;

    background:
        rgba(101, 203, 210, 0.055);

    color: var(--wt-cyan);

    font-size: 0.63rem;
    font-weight: 800;

    letter-spacing: 0.05em;
}


/* ============================================================
   BROWSER PIPELINE
   ============================================================ */

.browser-pipeline {
    display: flex;
    align-items: center;

    gap: 8px;

    overflow-x: auto;

    padding:
        4px
        2px
        14px;
}

.pipeline-step {
    flex:
        1
        1
        180px;

    min-width: 165px;

    padding:
        18px
        14px;

    border:
        1px solid var(--wt-border);

    border-radius: 13px;

    background: var(--wt-panel);

    text-align: center;
}

.pipeline-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 28px;
    height: 28px;

    margin-bottom: 7px;

    border-radius: 50%;

    background:
        rgba(101, 203, 210, 0.07);

    color: var(--wt-cyan-soft);

    font-size: 0.65rem;
    font-weight: 800;
}

.pipeline-step strong {
    display: block;

    color: #ffffff;

    font-size: 0.88rem;
}

.pipeline-step small {
    display: block;

    margin-top: 5px;

    color: var(--wt-text-muted);

    font-size: 0.72rem;

    line-height: 1.5;
}

.pipeline-arrow {
    flex-shrink: 0;

    color: var(--wt-gold);

    font-weight: 800;
}


/* ============================================================
   REAL WORLD
   ============================================================ */

.real-world-layout {
    display: grid;

    grid-template-columns:
        minmax(0, 1.05fr)
        minmax(300px, 0.95fr);

    gap: 18px;
}

.real-world-story {
    padding: 24px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background: var(--wt-panel);
}

.real-world-story h3 {
    margin:
        0
        0
        13px;

    color: #ffffff;

    font-size: 1.22rem;
}

.real-world-story p {
    margin:
        0
        0
        13px;

    color: var(--wt-text-soft);

    font-size: 0.91rem;
}

.real-world-story p:last-child {
    margin-bottom: 0;
}

.real-world-flow {
    padding: 20px;

    display: grid;

    align-content: center;

    gap: 7px;

    border:
        1px solid var(--wt-border);

    border-radius: var(--wt-radius);

    background:
        var(--wt-panel-3);
}

.rw-node {
    padding:
        10px
        12px;

    border:
        1px solid var(--wt-border);

    border-radius: 9px;

    background: var(--wt-panel);

    text-align: center;

    color: var(--wt-text-soft);

    font-size: 0.86rem;
}

.rw-arrow {
    text-align: center;

    color: var(--wt-cyan);
}


/* ============================================================
   ROADMAP
   ============================================================ */

.roadmap {
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 12px;
}

.roadmap-part {
    display: flex;
    align-items: flex-start;

    gap: 13px;

    padding:
        17px;

    border:
        1px solid var(--wt-border);

    border-radius: 13px;

    background: var(--wt-panel);
}

.roadmap-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 33px;
    height: 33px;

    flex-shrink: 0;

    border-radius: 9px;

    background:
        rgba(239, 198, 91, 0.07);

    border:
        1px solid rgba(239, 198, 91, 0.18);

    color: var(--wt-gold-soft);

    font-size: 0.75rem;
    font-weight: 800;
}

.roadmap-part h3 {
    margin:
        0
        4px;

    font-size: 0.98rem;

    color: #ffffff;
}

.roadmap-part p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.82rem;
}


/* ============================================================
   MISTAKES
   ============================================================ */

.mistake-grid {
    display: grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap: 12px;
}

.mistake-card {
    padding: 19px;

    border:
        1px solid rgba(232, 120, 109, 0.18);

    border-radius: 13px;

    background:
        rgba(232, 120, 109, 0.038);
}

.mistake-icon {
    display: inline-block;

    margin-bottom: 8px;

    font-size: 1.2rem;
}

.mistake-card h3 {
    margin:
        0
        6px;

    color: #ffffff;

    font-size: 0.96rem;
}

.mistake-card p {
    margin: 0;

    color: var(--wt-text-muted);

    font-size: 0.8rem;
}


/* ============================================================
   INTERVIEW
   ============================================================ */

.qa-list {
    display: grid;

    gap: 10px;
}

.qa-card {
    overflow: hidden;

    border:
        1px solid var(--wt-border);

    border-radius: 12px;

    background: var(--wt-panel);
}

.qa-question {
    display: flex;
    align-items: flex-start;

    gap: 12px;

    padding: 15px;
}

.qa-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 29px;
    height: 29px;

    flex-shrink: 0;

    border-radius: 8px;

    background:
        rgba(101, 203, 210, 0.07);

    color: var(--wt-cyan-soft);

    font-size: 0.65rem;
    font-weight: 800;
}

.qa-question > div {
    width: 100%;

    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 14px;
}

.qa-question strong {
    color: #ffffff;

    font-size: 0.9rem;
}

.show-answer {
    flex-shrink: 0;

    padding:
        7px
        10px;

    border:
        1px solid var(--wt-border);

    border-radius: 7px;

    background: var(--wt-panel-3);

    color: var(--wt-gold-soft);

    cursor: pointer;

    font-size: 0.68rem;
    font-weight: 800;
}

.qa-answer {
    display: none;

    padding:
        0
        15px
        17px
        56px;

    color: var(--wt-text-muted);

    font-size: 0.84rem;
}

.qa-card.answer-open .qa-answer {
    display: block;
}

.qa-card.answer-open .show-answer {
    color: var(--wt-cyan-soft);

    border-color:
        rgba(101, 203, 210, 0.24);
}

/* ============================================================
   FLIP CARDS — FIXED HEIGHT / NO OVERLAP
   ============================================================ */

.flip-card-grid {
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 18px;

    align-items: stretch;
}


.flip-card {
    position: relative;

    width: 100%;
    height: 270px;
    min-height: 270px;

    perspective: 1100px;

    cursor: pointer;

    outline: none;
}


.flip-card-inner {
    position: relative;

    width: 100%;
    height: 100%;
    min-height: 0;

    transform-style: preserve-3d;

    transition:
        transform 0.65s cubic-bezier(0.2, 0.7, 0.2, 1);
}


.flip-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}


.flip-card-face {
    position: absolute;

    inset: 0;

    width: 100%;
    height: 100%;
    min-height: 0;

    box-sizing: border-box;

    display: flex;
    flex-direction: column;

    padding: 22px;

    border:
        1px solid var(--wt-border);

    border-radius: 16px;

    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;

    overflow: hidden;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    box-shadow:
        0 14px 32px rgba(0, 0, 0, 0.16);
}


.flip-card-front {
    justify-content: space-between;
}


.flip-card-back {
    justify-content: flex-start;

    transform: rotateY(180deg);

    overflow-y: auto;

    border-color:
        rgba(101, 203, 210, 0.28);

    background:
        linear-gradient(
            145deg,
            rgba(101, 203, 210, 0.075),
            var(--wt-panel)
        );

    scrollbar-width: thin;
}


.flip-card-back::-webkit-scrollbar {
    width: 5px;
}


.flip-card-back::-webkit-scrollbar-track {
    background: transparent;
}


.flip-card-back::-webkit-scrollbar-thumb {
    background: var(--wt-border);

    border-radius: 10px;
}


.flip-card:focus-visible .flip-card-face {
    border-color:
        rgba(239, 198, 91, 0.55);

    box-shadow:
        0 0 0 3px rgba(239, 198, 91, 0.08),
        0 14px 32px rgba(0, 0, 0, 0.2);
}


.flip-card-label {
    display: inline-flex;
    align-items: center;

    align-self: flex-start;

    padding:
        5px
        9px;

    border-radius: 999px;

    background:
        rgba(239, 198, 91, 0.08);

    border:
        1px solid rgba(239, 198, 91, 0.2);

    color: var(--wt-gold-soft);

    font-size: 0.64rem;
    font-weight: 800;

    letter-spacing: 0.07em;
}


.flip-card-back .flip-card-label {
    background:
        rgba(101, 203, 210, 0.07);

    border-color:
        rgba(101, 203, 210, 0.2);

    color: var(--wt-cyan-soft);
}


.flip-card-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 34px;
    height: 34px;

    margin:
        14px
        0;

    border-radius: 10px;

    background:
        rgba(101, 203, 210, 0.07);

    border:
        1px solid rgba(101, 203, 210, 0.18);

    color: var(--wt-cyan-soft);

    font-size: 0.68rem;
    font-weight: 800;
}


.flip-card-front h3,
.flip-card-front h4 {
    margin:
        0
        0
        10px;

    color: #ffffff;

    font-size: 1.05rem;

    line-height: 1.45;
}


.flip-card-back h3,
.flip-card-back h4 {
    margin:
        12px
        0
        9px;

    color: #ffffff;

    font-size: 1rem;
}


.flip-card-back p {
    margin: 0;

    color: var(--wt-text-soft);

    font-size: 0.88rem;

    line-height: 1.7;
}


.flip-card-question {
    margin: 0;

    color: var(--wt-text-soft);

    font-size: 0.95rem;

    line-height: 1.6;
}


.flip-card-term {
    margin:
        18px
        0
        0;

    color: #ffffff;

    font-size: 1.18rem;
    font-weight: 800;

    line-height: 1.35;
}


.flip-card-hint {
    display: flex;
    align-items: center;

    gap: 7px;

    margin-top: auto;

    padding-top: 14px;

    color: var(--wt-text-muted);

    font-size: 0.72rem;
    font-weight: 700;

    letter-spacing: 0.02em;
}


.flip-card-hint::before {
    content: "↻";

    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 23px;
    height: 23px;

    flex-shrink: 0;

    border-radius: 50%;

    background:
        rgba(239, 198, 91, 0.07);

    border:
        1px solid rgba(239, 198, 91, 0.18);

    color: var(--wt-gold);
}


.flip-card-answer-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 37px;
    height: 37px;

    flex-shrink: 0;

    margin-top: 14px;

    border-radius: 10px;

    background:
        rgba(103, 197, 150, 0.08);

    border:
        1px solid rgba(103, 197, 150, 0.2);

    color: var(--wt-green);

    font-size: 1rem;
}


.flip-card-answer-note {
    margin-top: auto;

    padding-top: 14px;

    border-top:
        1px solid var(--wt-border-soft);

    color: var(--wt-text-muted);

    font-size: 0.69rem;
    font-weight: 700;
}


/* ============================================================
   GLOSSARY FLIP CARDS
   ============================================================ */

.glossary-flip-grid {
    display: grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap: 14px;

    align-items: stretch;
}


.glossary-flip-card {
    height: 205px;
    min-height: 205px;
}


.glossary-flip-card .flip-card-face {
    padding: 18px;
}


.glossary-flip-card .flip-card-term {
    margin-top: 17px;

    font-size: 1rem;
}


.glossary-flip-card .flip-card-back p {
    font-size: 0.8rem;

    line-height: 1.6;
}


/* ============================================================
   TABLET
   ============================================================ */

@media (max-width: 1050px) {

    .glossary-flip-grid {
        grid-template-columns:
            repeat(
                2,
                minmax(0, 1fr)
            );
    }

}


/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 760px) {

    .flip-card-grid,
    .glossary-flip-grid {
        grid-template-columns: 1fr;
    }


    .flip-card {
        height: 250px;
        min-height: 250px;
    }


    .glossary-flip-card {
        height: 200px;
        min-height: 200px;
    }

}


@media (max-width: 500px) {

    .flip-card {
        height: 255px;
        min-height: 255px;
    }


    .glossary-flip-card {
        height: 195px;
        min-height: 195px;
    }


    .flip-card-face {
        padding: 18px;
    }

}

/* ============================================================
   MCQ
   ============================================================ */

.mcq-grid {
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 14px;
}

.mcq-card {
    padding: 20px;

    border:
        1px solid var(--wt-border);

    border-radius: 14px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );
}

.mcq-header {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 10px;

    margin-bottom: 13px;

    color: var(--wt-text-muted);

    font-size: 0.73rem;
    font-weight: 800;

    letter-spacing: 0.05em;
}

.difficulty {
    padding:
        4px
        8px;

    border-radius: 999px;

    font-size: 0.62rem;
}

.difficulty.easy {
    background: rgba(103, 197, 150, 0.07);
    color: var(--wt-green);
}

.difficulty.medium {
    background: rgba(230, 167, 91, 0.08);
    color: var(--wt-orange);
}

.mcq-card h3 {
    margin:
        0
        15px;

    color: #ffffff;

    font-size: 0.96rem;

    line-height: 1.5;
}

.mcq-options {
    display: grid;

    gap: 7px;
}

.mcq-option {
    width: 100%;

    padding:
        10px
        11px;

    border:
        1px solid var(--wt-border);

    border-radius: 8px;

    background: var(--wt-panel-3);

    color: var(--wt-text-soft);

    text-align: left;

    cursor: pointer;

    font-size: 0.82rem;

    transition:
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease;
}

.mcq-option:hover {
    border-color:
        rgba(101, 203, 210, 0.28);

    color: #ffffff;
}

.mcq-option.correct {
    border-color:
        rgba(103, 197, 150, 0.4);

    background:
        rgba(103, 197, 150, 0.08);

    color: #ffffff;
}

.mcq-option.wrong {
    border-color:
        rgba(232, 120, 109, 0.4);

    background:
        rgba(232, 120, 109, 0.075);

    color: #ffffff;
}

.mcq-feedback {
    min-height: 20px;

    margin-top: 9px;

    color: var(--wt-text-muted);

    font-size: 0.77rem;
}


/* ============================================================
   PRACTICE
   ============================================================ */

.practice-list {
    display: grid;

    gap: 9px;
}

.practice-item {
    display: flex;
    align-items: center;

    gap: 12px;

    padding:
        13px
        15px;

    border:
        1px solid var(--wt-border);

    border-radius: 10px;

    background: var(--wt-panel);
}

.practice-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 28px;
    height: 28px;

    flex-shrink: 0;

    border-radius: 8px;

    background:
        rgba(101, 203, 210, 0.07);

    color: var(--wt-cyan-soft);

    font-size: 0.64rem;
    font-weight: 800;
}

.practice-item p {
    margin: 0;

    color: var(--wt-text-soft);

    font-size: 0.87rem;
}


/* ============================================================
   REVISION
   ============================================================ */

.revision-grid {
    display: grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap: 10px;
}

.revision-card {
    padding:
        17px
        13px;

    border:
        1px solid var(--wt-border);

    border-radius: 12px;

    background: var(--wt-panel);

    text-align: center;
}

.revision-card span {
    display: block;

    margin-bottom: 5px;

    font-size: 1.25rem;
}

.revision-card strong {
    display: block;

    color: #ffffff;

    font-size: 0.84rem;
}

.revision-card p {
    margin:
        3px
        0
        0;

    color: var(--wt-text-muted);

    font-size: 0.72rem;
}


/* ============================================================
   GLOSSARY
   ============================================================ */

.glossary-grid {
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 9px;
}

.glossary-item {
    border:
        1px solid var(--wt-border);

    border-radius: 10px;

    background: var(--wt-panel);

    overflow: hidden;
}

.glossary-item summary {
    padding:
        13px
        15px;

    color: #ffffff;

    cursor: pointer;

    font-size: 0.86rem;
    font-weight: 700;
}

.glossary-item p {
    margin: 0;

    padding:
        0
        15px
        14px;

    color: var(--wt-text-muted);

    font-size: 0.8rem;
}


/* ============================================================
   TAKEAWAY
   ============================================================ */

.takeaway-card {
    display: flex;
    align-items: flex-start;

    gap: 15px;

    padding: 24px;

    border:
        1px solid rgba(239, 198, 91, 0.25);

    border-radius: 17px;

    background:
        linear-gradient(
            145deg,
            rgba(239, 198, 91, 0.075),
            rgba(239, 198, 91, 0.025)
        );
}

.takeaway-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 44px;
    height: 44px;

    flex-shrink: 0;

    border-radius: 12px;

    background:
        rgba(239, 198, 91, 0.1);
}

.takeaway-card h2 {
    margin:
        0
        6px;

    color: var(--wt-gold-soft);

    font-size: 1.2rem;
}

.takeaway-card p {
    margin:
        0
        10px;

    color: var(--wt-text-soft);

    font-size: 0.89rem;
}

.takeaway-card p:last-child {
    margin-bottom: 0;
}


/* ============================================================
   TOPIC NAVIGATION — COMPACT
   ============================================================ */

.topic-navigation {
    display: grid;

    grid-template-columns:
        minmax(0, 1fr)
        minmax(0, 1fr);

    gap: 10px;

    margin-top: 22px;
}


.topic-nav-btn {
    display: flex;
    align-items: center;

    justify-content: space-between;

    gap: 10px;

    min-height: 54px;

    padding:
        9px
        12px;

    border:
        1px solid var(--wt-border);

    border-radius: 10px;

    background: var(--wt-panel);

    text-decoration: none;

    transition:
        transform 0.18s ease,
        border-color 0.18s ease,
        background 0.18s ease;
}


.topic-nav-btn:hover {
    transform: translateY(-1px);

    border-color:
        rgba(101, 203, 210, 0.28);

    background: var(--wt-panel-2);
}


.topic-nav-btn span {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    color: var(--wt-cyan);

    font-size: 0.95rem;
}


.topic-nav-btn.next span {
    color: var(--wt-gold);
}


.topic-nav-btn small {
    display: block;

    margin-bottom: 1px;

    color: var(--wt-text-muted);

    font-size: 0.58rem;
    font-weight: 800;

    letter-spacing: 0.05em;
}


.topic-nav-btn strong {
    display: block;

    color: #ffffff;

    font-size: 0.78rem;

    line-height: 1.35;
}


.topic-nav-btn.next {
    text-align: right;
}


/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 700px) {

    .topic-navigation {
        grid-template-columns: 1fr;

        gap: 8px;
    }


    .topic-nav-btn {
        min-height: 50px;

        padding:
            8px
            11px;
    }


    .topic-nav-btn.next {
        text-align: left;
    }

}


/* ============================================================
   COMPLETION
   ============================================================ */

.completion-section {
    margin-top: 25px;
}

.completion-card {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 18px;

    padding:
        21px;

    border:
        1px solid var(--wt-border);

    border-radius: 16px;

    background:
        linear-gradient(
            145deg,
            #242b31,
            #1b2024
        );
}

.completion-status {
    display: flex;
    align-items: center;

    gap: 13px;
}

.completion-icon {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 46px;
    height: 46px;

    border-radius: 12px;

    background:
        rgba(103, 197, 150, 0.09);

    border:
        1px solid rgba(103, 197, 150, 0.25);

    color: var(--wt-green);

    font-size: 1.25rem;
    font-weight: 900;
}

.completion-label {
    display: block;

    margin-bottom: 1px;

    color: var(--wt-text-muted);

    font-size: 0.65rem;
    font-weight: 800;

    letter-spacing: 0.06em;
}

.completion-status h2 {
    margin: 0;

    color: #ffffff;

    font-size: 1rem;
}

.completion-status p {
    margin:
        3px
        0
        0;

    color: var(--wt-text-muted);

    font-size: 0.77rem;
}

.completion-btn {
    min-height: 42px;

    padding:
        0
        16px;

    border-radius: 9px;

    background: var(--wt-gold);

    color: #151719;

    cursor: pointer;

    font-size: 0.8rem;
    font-weight: 900;

    transition:
        transform 0.15s ease,
        opacity 0.15s ease;
}

.completion-btn:hover {
    transform: translateY(-1px);
}

.completion-btn.completed {
    background:
        rgba(103, 197, 150, 0.12);

    border:
        1px solid rgba(103, 197, 150, 0.28);

    color: var(--wt-green);

    cursor: default;
}


/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 1050px) {

    .objective-grid,
    .technology-grid {
        grid-template-columns:
            repeat(
                2,
                minmax(0, 1fr)
            );
    }

    .mistake-grid {
        grid-template-columns:
            repeat(
                2,
                minmax(0, 1fr)
            );
    }

    .revision-grid {
        grid-template-columns:
            repeat(
                4,
                minmax(0, 1fr)
            );
    }

}

@media (max-width: 900px) {

    .architecture-grid,
    .real-world-layout,
    .roadmap,
    .mcq-grid {
        grid-template-columns:
            1fr;
    }

    .explanation-grid {
        grid-template-columns:
            1fr;
    }

    .client-server-layout {
        grid-template-columns:
            1fr;
    }

    .connection-arrow {
        grid-template-columns:
            1fr
            auto
            1fr;

        width: 100%;
    }

    .arrow-line {
        width: 100%;
        height: 2px;
        min-height: 2px;

        background:
            linear-gradient(
                90deg,
                transparent,
                var(--wt-cyan),
                transparent
            );
    }

    .database-flow,
    .browser-pipeline {
        justify-content: flex-start;
    }

}

@media (max-width: 700px) {

    .wt-page {
        width: min(
            calc(100% - 20px),
            var(--wt-content-width)
        );

        padding-top: 20px;
    }

    .wt-hero {
        padding:
            24px
            20px
            27px;

        border-radius: 17px;
    }

    .wt-hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 0.96rem;
    }

    .hero-meta {
        gap: 7px;
    }

    .hero-meta span {
        font-size: 0.75rem;
    }

    .objective-grid,
    .technology-grid,
    .mistake-grid,
    .revision-grid,
    .glossary-grid {
        grid-template-columns:
            1fr;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .vs-badge {
        width: 38px;
        height: 38px;
    }

    .section-heading h2 {
        font-size: 1.35rem;
    }

    .article-card,
    .side-panel,
    .completion-card,
    .trace-explanation,
    .takeaway-card {
        padding: 18px;
    }

    .trace-main {
        padding:
            19px
            13px
            17px;
    }

    .trace-timeline {
        grid-template-columns:
            repeat(
                8,
                74px
            );

        overflow-x: auto;

        padding-bottom: 5px;
    }

    .trace-controls {
        flex-wrap: wrap;
    }

    .trace-btn {
        flex: 1 1 120px;
    }

    .qa-question {
        align-items: flex-start;
    }

    .qa-question > div {
        align-items: flex-start;

        flex-direction: column;
    }

    .qa-answer {
        padding-left: 15px;
    }

    .topic-navigation {
        grid-template-columns: 1fr;
    }

    .topic-nav-btn.next {
        text-align: left;
    }

    .completion-card,
    .completion-status {
        align-items: flex-start;
    }

    .completion-card {
        flex-direction: column;
    }

    .completion-btn {
        width: 100%;
    }

}

@media (max-width: 460px) {

    .wt-page {
        width: calc(100% - 14px);
    }

    .wt-hero {
        padding:
            21px
            16px
            23px;
    }

    .wt-hero h1 {
        font-size: 1.7rem;
    }

    .section-heading {
        gap: 10px;
    }

    .section-number {
        min-width: 33px;
        height: 33px;
    }

    .section-heading h2 {
        font-size: 1.2rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding:
            11px
            10px;
    }

}

/* ============================================================
   LEVEL 05 — WEB APPLICATION ARCHITECTURE
   ============================================================ */


/* ============================================================
   SIMPLE ARCHITECTURE
   ============================================================ */

.simple-architecture {
    width: min(620px, 100%);

    margin:
        0
        auto;

    display: flex;
    flex-direction: column;

    align-items: center;

    gap: 9px;
}


.simple-node {
    width: min(370px, 100%);

    padding:
        18px
        15px;

    border:
        1px solid var(--wt-border);

    border-radius: 13px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    text-align: center;

    color: var(--wt-text-soft);

    font-size: 0.9rem;
    font-weight: 800;

    box-shadow:
        0 10px 25px rgba(0, 0, 0, 0.13);
}


.simple-node.browser {
    border-color:
        rgba(101, 203, 210, 0.25);

    color:
        var(--wt-cyan-soft);
}


.simple-node.application {
    border-color:
        rgba(239, 198, 91, 0.25);

    color:
        var(--wt-gold-soft);
}


.simple-node.database {
    border-color:
        rgba(103, 197, 150, 0.25);

    color:
        var(--wt-green);
}


.simple-arrow {
    color:
        var(--wt-text-muted);

    font-size:
        1.15rem;
}


/* ============================================================
   THREE TIER
   ============================================================ */

.three-tier-layout {
    display: grid;

    grid-template-columns:
        1fr;

    justify-items: center;

    gap: 9px;
}


.tier-card {
    width: min(
        760px,
        100%
    );

    padding: 22px;

    position: relative;

    border:
        1px solid var(--wt-border);

    border-radius: 16px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    text-align: center;
}


.presentation-tier {
    border-color:
        rgba(101, 203, 210, 0.22);
}


.application-tier {
    border-color:
        rgba(239, 198, 91, 0.22);
}


.data-tier {
    border-color:
        rgba(103, 197, 150, 0.22);
}


.tier-number {
    position: absolute;

    top: 13px;
    right: 14px;

    display: inline-flex;

    align-items: center;
    justify-content: center;

    width: 29px;
    height: 29px;

    border-radius: 50%;

    background:
        rgba(255, 255, 255, 0.04);

    color:
        var(--wt-text-muted);

    font-size: 0.64rem;
    font-weight: 800;
}


.tier-icon {
    font-size: 1.55rem;

    margin-bottom: 7px;
}


.tier-card h3 {
    margin:
        0
        0
        6px;

    color:
        #ffffff;

    font-size: 1.03rem;
}


.tier-card p {
    max-width: 700px;

    margin:
        0
        auto
        13px;

    color:
        var(--wt-text-muted);

    font-size: 0.85rem;
}


.tier-tags {
    display: flex;

    flex-wrap: wrap;

    justify-content: center;

    gap: 7px;
}


.tier-tags span {
    padding:
        5px
        8px;

    border-radius: 7px;

    background:
        rgba(255, 255, 255, 0.04);

    border:
        1px solid var(--wt-border-soft);

    color:
        var(--wt-text-soft);

    font-size: 0.68rem;
    font-weight: 700;
}


.tier-arrow {
    color:
        var(--wt-cyan);

    font-size:
        1.05rem;
}


/* ============================================================
   MVC
   ============================================================ */

.mvc-diagram {
    width: min(
        680px,
        100%
    );

    margin:
        0
        auto;

    display: grid;

    grid-template-columns:
        1fr
        70px
        1fr
        70px
        1fr;

    align-items: center;

    gap: 9px;
}


.mvc-node {
    min-height: 150px;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: center;

    gap: 7px;

    padding:
        17px;

    border:
        1px solid var(--wt-border);

    border-radius: 15px;

    background:
        var(--wt-panel);

    text-align: center;
}


.mvc-node > span {
    font-size: 1.6rem;
}


.mvc-node strong {
    color:
        #ffffff;

    font-size: 0.84rem;

    letter-spacing:
        0.04em;
}


.mvc-node small {
    color:
        var(--wt-text-muted);

    font-size: 0.68rem;

    line-height:
        1.45;
}


.mvc-node.model {
    border-color:
        rgba(103, 197, 150, 0.25);
}


.mvc-node.controller {
    border-color:
        rgba(239, 198, 91, 0.28);
}


.mvc-node.view {
    border-color:
        rgba(101, 203, 210, 0.25);
}


.mvc-connector {
    text-align: center;

    color:
        var(--wt-text-muted);

    font-size:
        1.15rem;
}


.mvc-responsibility-grid {
    display: grid;

    grid-template-columns:
        repeat(
            3,
            minmax(0, 1fr)
        );

    gap: 13px;

    margin-top: 17px;
}


.mvc-responsibility-grid .architecture-card {
    min-height: 180px;
}


/* ============================================================
   MVC FLOW
   ============================================================ */

.mvc-request-flow {
    display: flex;

    align-items: center;

    gap: 8px;

    overflow-x: auto;

    padding:
        4px
        2px
        14px;
}


.mvc-flow-node {
    flex:
        0
        0
        145px;

    min-height: 68px;

    display: flex;

    align-items: center;
    justify-content: center;

    padding:
        10px;

    border:
        1px solid var(--wt-border);

    border-radius: 10px;

    background:
        var(--wt-panel);

    color:
        var(--wt-text-soft);

    text-align: center;

    font-size:
        0.78rem;

    font-weight:
        700;
}


.controller-flow {
    border-color:
        rgba(239, 198, 91, 0.28);

    color:
        var(--wt-gold-soft);
}


.model-flow {
    border-color:
        rgba(103, 197, 150, 0.27);

    color:
        var(--wt-green);
}


.view-flow {
    border-color:
        rgba(101, 203, 210, 0.27);

    color:
        var(--wt-cyan-soft);
}


.mvc-flow-arrow {
    flex-shrink: 0;

    color:
        var(--wt-cyan);

    font-size:
        1rem;

    font-weight:
        800;
}


.return-arrow {
    color:
        var(--wt-gold);
}


/* ============================================================
   MONOLITH / LAYERED
   ============================================================ */

.monolith-box,
.layered-box {
    display: grid;

    gap: 7px;

    margin:
        0
        0
        14px;
}


.monolith-box div,
.layered-box div {
    padding:
        10px
        12px;

    border:
        1px solid var(--wt-border);

    border-radius:
        8px;

    background:
        var(--wt-panel-3);

    color:
        var(--wt-text-soft);

    text-align:
        center;

    font-size:
        0.76rem;

    font-weight:
        700;
}


.monolith-box div:nth-child(2) {
    color:
        var(--wt-gold-soft);
}


.monolith-box div:nth-child(3) {
    color:
        var(--wt-cyan-soft);
}


.monolith-box div:nth-child(4) {
    color:
        var(--wt-green);
}


.layered-box div:nth-child(1) {
    border-color:
        rgba(101, 203, 210, 0.2);

    color:
        var(--wt-cyan-soft);
}


.layered-box div:nth-child(2) {
    border-color:
        rgba(239, 198, 91, 0.2);

    color:
        var(--wt-gold-soft);
}


.layered-box div:nth-child(3) {
    border-color:
        rgba(103, 197, 150, 0.2);

    color:
        var(--wt-green);
}


/* ============================================================
   API ARCHITECTURE
   ============================================================ */

.api-architecture {
    display: flex;

    align-items: center;

    gap: 9px;

    overflow-x: auto;

    padding:
        4px
        2px
        15px;
}


.api-side,
.api-gateway-box {
    flex:
        1
        1
        150px;

    min-width:
        145px;

    min-height:
        120px;

    display: flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    gap:
        5px;

    padding:
        15px;

    border:
        1px solid var(--wt-border);

    border-radius:
        13px;

    background:
        var(--wt-panel);

    text-align:
        center;
}


.api-gateway-box {
    border-color:
        rgba(101, 203, 210, 0.28);

    background:
        rgba(101, 203, 210, 0.045);
}


.api-icon {
    font-size:
        1.45rem;
}


.api-side strong,
.api-gateway-box strong {
    color:
        #ffffff;

    font-size:
        0.85rem;
}


.api-side small,
.api-gateway-box small {
    color:
        var(--wt-text-muted);

    font-size:
        0.68rem;
}


.api-arrow {
    flex-shrink: 0;

    color:
        var(--wt-cyan);

    font-weight:
        900;
}


/* ============================================================
   SECURITY BOUNDARY
   ============================================================ */

.security-boundary {
    display: flex;

    align-items: center;

    gap:
        8px;

    overflow-x: auto;

    padding:
        4px
        2px
        15px;
}


.security-node,
.security-gate {
    flex:
        1
        1
        150px;

    min-width:
        145px;

    min-height:
        105px;

    display: flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    padding:
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        12px;

    background:
        var(--wt-panel);

    text-align:
        center;

    color:
        var(--wt-text-soft);

    font-size:
        0.8rem;
}


.security-gate {
    border-color:
        rgba(239, 198, 91, 0.25);

    background:
        rgba(239, 198, 91, 0.045);
}


.security-gate span {
    margin-bottom:
        5px;

    font-size:
        1.25rem;
}


.security-gate strong {
    color:
        var(--wt-gold-soft);

    font-size:
        0.78rem;
}


.security-gate small {
    color:
        var(--wt-text-muted);

    font-size:
        0.65rem;
}


.security-arrow {
    flex-shrink:
        0;

    color:
        var(--wt-cyan);

    font-weight:
        900;
}


/* ============================================================
   CACHE
   ============================================================ */

.cache-architecture {
    display: flex;

    align-items: center;

    gap:
        9px;

    overflow-x: auto;

    padding:
        4px
        2px
        15px;
}


.cache-node {
    flex:
        1
        1
        150px;

    min-width:
        145px;

    min-height:
        78px;

    display: flex;

    align-items:
        center;

    justify-content:
        center;

    padding:
        12px;

    border:
        1px solid var(--wt-border);

    border-radius:
        12px;

    background:
        var(--wt-panel);

    color:
        var(--wt-text-soft);

    text-align:
        center;

    font-size:
        0.8rem;

    font-weight:
        800;
}


.highlight-cache {
    border-color:
        rgba(103, 197, 150, 0.3);

    color:
        var(--wt-green);

    background:
        rgba(103, 197, 150, 0.045);
}


.cache-arrow {
    flex-shrink:
        0;

    color:
        var(--wt-cyan);

    font-weight:
        900;
}


/* ============================================================
   CDN
   ============================================================ */

.cdn-layout {
    display: grid;

    grid-template-columns:
        210px
        minmax(0, 1fr);

    align-items: center;

    gap:
        20px;

    padding:
        5px;
}


.cdn-origin {
    min-height:
        150px;

    display: flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    gap:
        6px;

    padding:
        17px;

    border:
        1px solid var(--wt-border);

    border-radius:
        15px;

    background:
        var(--wt-panel);

    text-align:
        center;
}


.cdn-origin span {
    font-size:
        1.7rem;
}


.cdn-origin strong {
    color:
        #ffffff;

    font-size:
        0.9rem;
}


.cdn-origin small {
    color:
        var(--wt-text-muted);

    font-size:
        0.68rem;
}


.cdn-world {
    position:
        relative;

    min-height:
        190px;

    display:
        flex;

    align-items:
        center;

    justify-content:
        space-around;

    padding:
        20px;

    border:
        1px solid var(--wt-border);

    border-radius:
        15px;

    background:
        radial-gradient(
            circle at center,
            rgba(101, 203, 210, 0.05),
            transparent 65%
        ),
        var(--wt-panel-3);
}


.cdn-line {
    position:
        absolute;

    left:
        10%;

    right:
        10%;

    top:
        50%;

    height:
        1px;

    background:
        var(--wt-border);
}


.cdn-point {
    position:
        relative;

    z-index:
        2;

    width:
        62px;

    height:
        62px;

    display:
        flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    gap:
        2px;

    border:
        1px solid var(--wt-border);

    border-radius:
        50%;

    background:
        var(--wt-panel);

    font-size:
        1.15rem;
}


.cdn-point small {
    color:
        var(--wt-text-muted);

    font-size:
        0.55rem;
}


/* ============================================================
   LOAD BALANCER
   ============================================================ */

.load-balancer-diagram {
    display: flex;

    flex-direction:
        column;

    align-items:
        center;

    gap:
        8px;
}


.lb-source,
.lb-box {
    display: flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    gap:
        3px;

    min-width:
        180px;

    min-height:
        75px;

    padding:
        12px;

    border:
        1px solid var(--wt-border);

    border-radius:
        11px;

    background:
        var(--wt-panel);

    text-align:
        center;

    color:
        var(--wt-text-soft);

    font-size:
        0.8rem;
}


.lb-box {
    border-color:
        rgba(239, 198, 91, 0.3);

    color:
        var(--wt-gold-soft);

    background:
        rgba(239, 198, 91, 0.045);
}


.lb-source {
    border-color:
        rgba(101, 203, 210, 0.25);

    color:
        var(--wt-cyan-soft);
}


.lb-arrow {
    color:
        var(--wt-cyan);

    font-weight:
        900;
}


.split-arrow {
    font-size:
        1.05rem;
}


.lb-servers {
    width:
        min(700px, 100%);

    display:
        grid;

    grid-template-columns:
        repeat(
            3,
            minmax(0, 1fr)
        );

    gap:
        9px;
}


.lb-server {
    padding:
        15px
        10px;

    border:
        1px solid var(--wt-border);

    border-radius:
        10px;

    background:
        var(--wt-panel);

    color:
        var(--wt-text-soft);

    text-align:
        center;

    font-size:
        0.76rem;

    font-weight:
        700;
}


/* ============================================================
   COMPLETE ARCHITECTURE
   ============================================================ */

.complete-architecture {
    width:
        min(950px, 100%);

    margin:
        0
        auto;

    display:
        grid;

    gap:
        8px;
}


.complete-row {
    display:
        grid;

    gap:
        8px;

    justify-content:
        center;
}


.clients-row {
    grid-template-columns:
        repeat(
            2,
            minmax(130px, 200px)
        );
}


.edge-row {
    grid-template-columns:
        repeat(
            3,
            minmax(130px, 190px)
        );
}


.app-row {
    grid-template-columns:
        repeat(
            4,
            minmax(110px, 175px)
        );
}


.service-row {
    grid-template-columns:
        repeat(
            3,
            minmax(125px, 185px)
        );
}


.data-row {
    grid-template-columns:
        repeat(
            3,
            minmax(125px, 185px)
        );
}


.complete-node {
    min-height:
        68px;

    display:
        flex;

    align-items:
        center;

    justify-content:
        center;

    padding:
        10px;

    border:
        1px solid var(--wt-border);

    border-radius:
        10px;

    background:
        var(--wt-panel);

    color:
        var(--wt-text-soft);

    text-align:
        center;

    font-size:
        0.72rem;

    font-weight:
        700;
}


.clients-row .complete-node {
    border-color:
        rgba(101, 203, 210, 0.2);
}


.edge-row .complete-node {
    border-color:
        rgba(101, 203, 210, 0.18);
}


.app-row .complete-node {
    border-color:
        rgba(239, 198, 91, 0.19);
}


.service-row .complete-node {
    border-color:
        rgba(239, 198, 91, 0.18);
}


.data-row .complete-node {
    border-color:
        rgba(103, 197, 150, 0.19);
}


.complete-connector {
    text-align:
        center;

    color:
        var(--wt-text-muted);

    font-size:
        1.05rem;
}


/* ============================================================
   ARCHITECTURE BUILDER
   ============================================================ */

.architecture-builder-shell {
    overflow:
        hidden;

    border:
        1px solid var(--wt-border);

    border-radius:
        18px;

    background:
        linear-gradient(
            160deg,
            #14191d,
            #0e1215
        );

    box-shadow:
        0 20px 45px rgba(0, 0, 0, 0.25);
}


.builder-controls {
    display:
        flex;

    flex-wrap:
        wrap;

    gap:
        7px;

    padding:
        11px;

    border-bottom:
        1px solid var(--wt-border);

    background:
        rgba(255, 255, 255, 0.02);
}


.builder-choice {
    min-height:
        36px;

    padding:
        0
        12px;

    border:
        1px solid var(--wt-border);

    border-radius:
        8px;

    background:
        var(--wt-panel-3);

    color:
        var(--wt-text-muted);

    cursor:
        pointer;

    font-size:
        0.72rem;

    font-weight:
        800;

    transition:
        background 0.16s ease,
        color 0.16s ease,
        border-color 0.16s ease;
}


.builder-choice:hover {
    color:
        var(--wt-text-soft);

    background:
        var(--wt-panel);
}


.builder-choice.active {
    color:
        var(--wt-gold-soft);

    border-color:
        rgba(239, 198, 91, 0.35);

    background:
        rgba(239, 198, 91, 0.075);
}


.builder-description {
    padding:
        16px
        16px
        4px;

    color:
        var(--wt-text-soft);

    text-align:
        center;

    font-size:
        0.83rem;

    font-weight:
        700;
}


.builder-canvas {
    width:
        min(700px, 100%);

    min-height:
        370px;

    margin:
        0
        auto;

    padding:
        25px
        20px;

    display:
        flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    gap:
        7px;
}


.builder-node {
    width:
        min(420px, 100%);

    min-height:
        68px;

    display:
        grid;

    grid-template-columns:
        42px
        minmax(0, 1fr)
        auto;

    align-items:
        center;

    gap:
        10px;

    padding:
        10px
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        11px;

    background:
        var(--wt-panel);

    text-align:
        left;

    transition:
        transform 0.2s ease,
        border-color 0.2s ease;
}


.builder-node:hover {
    transform:
        translateY(-2px);

    border-color:
        rgba(101, 203, 210, 0.28);
}


.builder-node-icon {
    display:
        inline-flex;

    align-items:
        center;

    justify-content:
        center;

    width:
        36px;

    height:
        36px;

    border-radius:
        9px;

    background:
        rgba(255, 255, 255, 0.04);

    font-size:
        1.1rem;
}


.builder-node strong {
    color:
        #ffffff;

    font-size:
        0.81rem;
}


.builder-node small {
    color:
        var(--wt-text-muted);

    font-size:
        0.65rem;
}


.builder-arrow {
    color:
        var(--wt-cyan);

    font-size:
        1rem;

    font-weight:
        900;
}


.builder-status {
    display:
        flex;

    align-items:
        center;

    gap:
        9px;

    padding:
        12px
        14px;

    border-top:
        1px solid var(--wt-border);

    color:
        var(--wt-text-muted);

    font-size:
        0.7rem;
}


/* ============================================================
   LEVEL 05 RESPONSIVE
   ============================================================ */

@media (max-width: 950px) {

    .mvc-diagram {
        grid-template-columns:
            1fr;
    }


    .mvc-connector {
        transform:
            rotate(90deg);
    }


    .mvc-responsibility-grid {
        grid-template-columns:
            1fr;
    }


    .cdn-layout {
        grid-template-columns:
            1fr;
    }


    .cdn-origin {
        width:
            min(260px, 100%);

        margin:
            0
            auto;
    }


    .app-row {
        grid-template-columns:
            repeat(
                2,
                minmax(120px, 1fr)
            );
    }

}


@media (max-width: 760px) {

    .api-architecture,
    .security-boundary,
    .cache-architecture {
        justify-content:
            flex-start;
    }


    .lb-servers {
        grid-template-columns:
            1fr;
    }


    .clients-row,
    .edge-row,
    .service-row,
    .data-row,
    .app-row {
        grid-template-columns:
            1fr;
    }


    .complete-row {
        width:
            100%;
    }


    .cdn-world {
        overflow:
            hidden;
    }


    .cdn-point {
        width:
            52px;

        height:
            52px;
    }


    .builder-node {
        grid-template-columns:
            36px
            minmax(0, 1fr);
    }


    .builder-node small {
        grid-column:
            2;
    }

}


@media (max-width: 500px) {

    .tier-card {
        padding:
            19px
            15px;
    }


    .builder-canvas {
        min-height:
            330px;

        padding:
            18px
            12px;
    }


    .builder-node {
        width:
            100%;
    }


    .builder-description {
        line-height:
            1.55;
    }

}

/* ============================================================
   LEVEL 06 — DEVELOPMENT TOOLS AND WORKFLOW
   ============================================================ */


/* ============================================================
   EDITOR
   ============================================================ */

.editor-layout {
    display: grid;

    grid-template-columns:
        minmax(0, 1.3fr)
        minmax(260px, 0.7fr);

    gap: 15px;

    align-items: stretch;
}


.editor-window {
    overflow: hidden;

    border:
        1px solid var(--wt-border);

    border-radius: 15px;

    background:
        #0d1114;

    box-shadow:
        0 16px 36px rgba(0, 0, 0, 0.2);
}


.editor-topbar {
    display: flex;

    align-items: center;
    justify-content: center;

    position: relative;

    min-height: 39px;

    border-bottom:
        1px solid var(--wt-border);

    background:
        #171c20;
}


.editor-dots {
    position: absolute;

    left: 12px;

    display: flex;

    gap: 5px;
}


.editor-dots span {
    width: 8px;
    height: 8px;

    border-radius: 50%;

    background:
        var(--wt-border);
}


.editor-title {
    color:
        var(--wt-text-muted);

    font-size:
        0.68rem;

    font-weight:
        700;
}


.editor-body {
    padding:
        14px
        9px;

    overflow-x: auto;

    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        Consolas,
        monospace;

    font-size:
        0.74rem;

    line-height:
        1.75;
}


.editor-line {
    display: grid;

    grid-template-columns:
        32px
        minmax(0, 1fr);

    gap:
        8px;

    padding:
        1px
        7px;

    border-radius:
        5px;
}


.editor-line > span {
    color:
        #59636d;

    text-align:
        right;

    user-select:
        none;
}


.editor-line code {
    color:
        var(--wt-text-soft);

    white-space:
        pre;

    font-family:
        inherit;
}


.active-editor-line {
    background:
        rgba(101, 203, 210, 0.08);
}


.active-editor-line code {
    color:
        var(--wt-cyan-soft);
}


.editor-features {
    display:
        grid;

    gap:
        9px;

    padding:
        8px;
}


.editor-feature {
    display:
        flex;

    align-items:
        flex-start;

    gap:
        10px;

    padding:
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        11px;

    background:
        var(--wt-panel);
}


.editor-feature > span {
    display:
        inline-flex;

    align-items:
        center;
    justify-content:
        center;

    width:
        28px;

    height:
        28px;

    flex-shrink:
        0;

    border-radius:
        8px;

    background:
        rgba(239, 198, 91, 0.07);

    color:
        var(--wt-gold-soft);

    font-size:
        0.62rem;

    font-weight:
        800;
}


.editor-feature strong {
    display:
        block;

    color:
        #ffffff;

    font-size:
        0.8rem;
}


.editor-feature p {
    margin:
        3px
        0
        0;

    color:
        var(--wt-text-muted);

    font-size:
        0.71rem;

    line-height:
        1.5;
}


/* ============================================================
   PROJECT TREE
   ============================================================ */

.project-tree {
    width:
        min(700px, 100%);

    margin:
        0
        auto;

    padding:
        19px;

    border:
        1px solid var(--wt-border);

    border-radius:
        15px;

    background:
        #0d1114;

    box-shadow:
        0 14px 32px rgba(0, 0, 0, 0.16);

    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        Consolas,
        monospace;

    font-size:
        0.77rem;

    line-height:
        1.85;

    overflow-x:
        auto;
}


.project-tree-title {
    margin-bottom:
        9px;

    color:
        var(--wt-gold-soft);

    font-size:
        0.66rem;

    font-weight:
        800;

    letter-spacing:
        0.06em;
}


.project-tree-row {
    color:
        var(--wt-text-soft);

    white-space:
        nowrap;
}


.root-row {
    color:
        var(--wt-cyan-soft);

    font-weight:
        800;
}


.indent {
    padding-left:
        25px;

    color:
        var(--wt-text-muted);
}


.project-purpose-grid {
    display:
        grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap:
        11px;

    margin-top:
        15px;
}


.project-purpose-grid .architecture-card {
    min-height:
        135px;
}


.project-purpose-grid .architecture-card p {
    margin:
        0;

    color:
        var(--wt-text-muted);

    font-size:
        0.78rem;
}


/* ============================================================
   DEBUG METHOD
   ============================================================ */

.debug-method {
    display:
        flex;

    align-items:
        center;

    gap:
        8px;

    overflow-x:
        auto;

    padding:
        3px
        2px
        13px;
}


.debug-step {
    flex:
        1
        1
        155px;

    min-width:
        145px;

    min-height:
        125px;

    display:
        flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    padding:
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        12px;

    background:
        var(--wt-panel);

    text-align:
        center;
}


.debug-step > span {
    display:
        inline-flex;

    align-items:
        center;
    justify-content:
        center;

    width:
        28px;

    height:
        28px;

    margin-bottom:
        7px;

    border-radius:
        50%;

    background:
        rgba(101, 203, 210, 0.07);

    color:
        var(--wt-cyan-soft);

    font-size:
        0.62rem;

    font-weight:
        800;
}


.debug-step strong {
    color:
        #ffffff;

    font-size:
        0.8rem;
}


.debug-step small {
    margin-top:
        4px;

    color:
        var(--wt-text-muted);

    font-size:
        0.68rem;

    line-height:
        1.45;
}


.debug-arrow {
    flex-shrink:
        0;

    color:
        var(--wt-cyan);

    font-weight:
        900;
}


/* ============================================================
   VALIDATION
   ============================================================ */

.validation-grid {
    display:
        grid;

    grid-template-columns:
        repeat(
            4,
            minmax(0, 1fr)
        );

    gap:
        12px;
}


.validation-card {
    padding:
        19px;

    border:
        1px solid var(--wt-border);

    border-radius:
        13px;

    background:
        linear-gradient(
            145deg,
            var(--wt-panel-2),
            var(--wt-panel)
        );

    text-align:
        center;
}


.validation-icon {
    display:
        inline-flex;

    align-items:
        center;
    justify-content:
        center;

    width:
        37px;

    height:
        37px;

    margin-bottom:
        8px;

    border-radius:
        10px;

    background:
        rgba(103, 197, 150, 0.07);

    color:
        var(--wt-green);

    font-weight:
        900;
}


.validation-card h3 {
    margin:
        0
        5px;

    color:
        #ffffff;

    font-size:
        0.92rem;
}


.validation-card p {
    min-height:
        52px;

    margin:
        0
        10px;

    color:
        var(--wt-text-muted);

    font-size:
        0.77rem;
}


.validation-card span {
    display:
        inline-flex;

    padding:
        5px
        8px;

    border-radius:
        6px;

    background:
        rgba(101, 203, 210, 0.05);

    color:
        var(--wt-cyan);

    font-size:
        0.59rem;

    font-weight:
        800;

    letter-spacing:
        0.05em;
}


/* ============================================================
   GIT WORKFLOW
   ============================================================ */

.git-workflow {
    display:
        flex;

    align-items:
        center;

    gap:
        8px;

    overflow-x:
        auto;

    padding:
        3px
        2px
        13px;
}


.git-step {
    flex:
        1
        1
        160px;

    min-width:
        145px;

    min-height:
        120px;

    display:
        flex;

    flex-direction:
        column;

    align-items:
        center;

    justify-content:
        center;

    padding:
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        12px;

    background:
        var(--wt-panel);

    text-align:
        center;
}


.git-step > span {
    display:
        inline-flex;

    align-items:
        center;
    justify-content:
        center;

    width:
        28px;

    height:
        28px;

    margin-bottom:
        7px;

    border-radius:
        50%;

    background:
        rgba(239, 198, 91, 0.07);

    color:
        var(--wt-gold-soft);

    font-size:
        0.62rem;

    font-weight:
        800;
}


.git-step strong {
    color:
        #ffffff;

    font-size:
        0.78rem;
}


.git-step small {
    margin-top:
        4px;

    color:
        var(--wt-text-muted);

    font-size:
        0.67rem;
}


.git-arrow {
    flex-shrink:
        0;

    color:
        var(--wt-cyan);

    font-weight:
        900;
}


/* ============================================================
   PROFESSIONAL WORKFLOW
   ============================================================ */

.professional-workflow {
    width:
        min(760px, 100%);

    margin:
        0
        auto;

    display:
        grid;

    gap:
        7px;
}


.workflow-stage {
    display:
        grid;

    grid-template-columns:
        34px
        minmax(0, 1fr)
        auto;

    align-items:
        center;

    gap:
        10px;

    padding:
        11px
        13px;

    border:
        1px solid var(--wt-border);

    border-radius:
        10px;

    background:
        var(--wt-panel);
}


.workflow-stage > span {
    display:
        inline-flex;

    align-items:
        center;
    justify-content:
        center;

    width:
        29px;

    height:
        29px;

    border-radius:
        8px;

    background:
        rgba(101, 203, 210, 0.06);

    color:
        var(--wt-cyan-soft);

    font-size:
        0.61rem;

    font-weight:
        800;
}


.workflow-stage strong {
    color:
        #ffffff;

    font-size:
        0.78rem;
}


.workflow-stage small {
    color:
        var(--wt-text-muted);

    font-size:
        0.66rem;
}


.workflow-arrow {
    text-align:
        center;

    color:
        var(--wt-text-muted);

    font-size:
        0.9rem;
}


/* ============================================================
   LEVEL 06 RESPONSIVE
   ============================================================ */

@media (max-width: 1000px) {

    .editor-layout {
        grid-template-columns:
            1fr;
    }


    .project-purpose-grid,
    .validation-grid {
        grid-template-columns:
            repeat(
                2,
                minmax(0, 1fr)
            );
    }

}


@media (max-width: 760px) {

    .project-purpose-grid,
    .validation-grid {
        grid-template-columns:
            1fr;
    }


    .editor-body {
        font-size:
            0.68rem;
    }


    .workflow-stage {
        grid-template-columns:
            31px
            minmax(0, 1fr);
    }


    .workflow-stage small {
        grid-column:
            2;
    }

}


@media (max-width: 500px) {

    .project-tree {
        padding:
            14px;

        font-size:
            0.69rem;
    }


    .editor-body {
        padding:
            11px
            6px;
    }


    .debug-step,
    .git-step {
        min-height:
            110px;
    }

}