/* =============================================================================
   aksun.biz — main.css
   Single consolidated stylesheet. Cascade order is explicit via @layer so
   component overrides never depend on source order.
   Sections: 1 tokens · 2 base · 3 layout · 4 components · 5 utilities
   Breakpoints: 1024px · 900px · 768px
   ========================================================================== */

@layer tokens, base, layout, components, utilities;

/* =============================================================================
   1. TOKENS
   ========================================================================== */
@layer tokens {
  :root {
    /* Brand palette */
    --deep-navy: #0F1125;
    --sky: #4290BC;
    --gold: #B89355;
    --gold-deep: #9a7b46;
    --white: #FFFFFF;
    --slate: #7E8DA1;
    --urgent-red: #ff6b6b;

    /* Derived surfaces / lines */
    --border-muted: rgba(255, 255, 255, 0.08);
    --grid-line: rgba(184, 147, 85, 0.03);
    --surface-1: rgba(255, 255, 255, 0.01);
    --surface-2: rgba(255, 255, 255, 0.02);
    --surface-3: rgba(255, 255, 255, 0.04);
    --gold-wash: rgba(184, 147, 85, 0.05);
    --sky-wash: rgba(66, 144, 188, 0.05);

    /* Typography */
    --ff-display: 'Inter', sans-serif;
    --ff-brand: 'Montserrat', sans-serif;
    --ff-mono: 'Roboto Mono', monospace;
    --ff-body: 'Public Sans', sans-serif;

    --fs-h1: clamp(48px, 7vw, 92px);
    --fs-h1-page: clamp(32px, 5vw, 56px);
    --fs-h2: clamp(26px, 3vw, 42px);
    --fs-h3: 22px;
    --fs-body: 16px;
    --fs-small: 14px;
    --fs-mono: 11px;

    /* Spacing scale */
    --space-1: 5px;
    --space-2: 10px;
    --space-3: 15px;
    --space-4: 20px;
    --space-5: 25px;
    --space-6: 30px;
    --space-8: 45px;
    --space-10: 60px;
    --space-section: 140px;

    /* Structure */
    --container: 1400px;
    --grid-gap: 30px;
    --radius: 2px;
    --radius-pill: 20px;

    /* Motion */
    --transition: 0.3s ease;
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);

    /* Layers */
    --z-grid: -1;
    --z-nav: 1000;

    --theme-color: #0F1125;
  }
}

/* =============================================================================
   2. BASE & RESET
   ========================================================================== */
@layer base {
  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    background: var(--deep-navy);
    color: var(--white);
    font-family: var(--ff-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  img, svg, video { display: block; max-width: 100%; }

  a { color: inherit; text-decoration: none; }

  button { font: inherit; color: inherit; cursor: pointer; }

  :focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: 3px;
  }

  /* Skip link for keyboard users */
  .skip-link {
    position: absolute; left: -9999px; top: 0; z-index: calc(var(--z-nav) + 1);
    background: var(--gold); color: var(--white); padding: 12px 20px;
    font-family: var(--ff-mono); font-size: 12px;
  }
  .skip-link:focus { left: 0; }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.001ms !important;
    }
  }
}

/* =============================================================================
   3. LAYOUT
   ========================================================================== */
@layer layout {
  /* Architectural 12-column grid backdrop */
  .grid-layer {
    position: fixed; inset: 0; width: 100%; height: 100%;
    background-image:
      linear-gradient(var(--grid-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 8.333% 100%;
    z-index: var(--z-grid); pointer-events: none;
  }

  .container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    width: 90%;
    max-width: var(--container);
    margin: 0 auto;
    gap: var(--grid-gap);
  }
  .container--wide { max-width: 1600px; }
  .container--narrow { max-width: 1200px; }
  .container--flow { margin-block: 60px; }

  /* Golden vertical spine */
  .spine {
    position: absolute; top: 0; width: 1px; height: 100%;
    opacity: 0.3; z-index: 0; pointer-events: none;
  }
  .spine--center {
    left: 50%;
    background: linear-gradient(180deg, transparent 0%, var(--gold) 15%, var(--gold) 85%, transparent 100%);
  }
  .spine--left {
    left: -40px;
    background: linear-gradient(180deg, var(--gold), transparent);
  }

  /* Column-span helpers (replace inline grid-column declarations) */
  .col-span-12 { grid-column: span 12; }
  .col-2-10 { grid-column: 2 / span 10; }
  .col-3-8  { grid-column: 3 / span 8; }

  @media (max-width: 1024px) {
    .col-2-10, .col-3-8 { grid-column: 1 / span 12; }
  }
}

/* =============================================================================
   4. COMPONENTS
   ========================================================================== */
@layer components {

  /* ---- 4.1 Navigation ---------------------------------------------------- */
  .site-nav {
    position: sticky; top: 0; width: 100%;
    padding: 22px 5%;
    display: flex; justify-content: space-between; align-items: center;
    z-index: var(--z-nav);
    background: rgba(15, 17, 37, 0.85);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-muted);
  }

  .brand {
    font-family: var(--ff-brand); font-size: 22px; font-weight: 700;
    letter-spacing: -1px; color: var(--white);
  }

  .site-nav__menu { display: flex; align-items: center; gap: 30px; }
  .site-nav__links { display: flex; gap: 30px; }
  .site-nav__links a {
    font-family: var(--ff-mono); font-size: var(--fs-mono); font-weight: 600;
    color: var(--slate); letter-spacing: 1.5px; transition: color var(--transition);
  }
  .site-nav__links a:hover,
  .site-nav__links a[aria-current="page"] { color: var(--gold); }

  /* Language switch */
  .lang-switch { display: flex; gap: 8px; align-items: center; font-family: var(--ff-mono); font-size: 10px; letter-spacing: 1px; }
  .lang-switch a { color: var(--slate); transition: color var(--transition); }
  .lang-switch a[aria-current="true"] { color: var(--gold); }
  .lang-switch a:hover { color: var(--white); }
  .lang-switch__sep { color: var(--border-muted); }

  /* ---- 4.2 Footer -------------------------------------------------------- */
  .site-footer {
    grid-column: span 12;
    padding: 60px 0;
    border-top: 1px solid var(--border-muted);
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 20px;
    color: var(--slate); font-size: var(--fs-mono);
  }
  .site-footer__links { display: flex; gap: 20px; }
  .site-footer__links a { font-family: var(--ff-mono); color: var(--slate); transition: color var(--transition); }
  .site-footer__links a:hover { color: var(--white); }
  .site-footer__brand { font-family: var(--ff-brand); font-weight: 700; opacity: 0.5; transition: opacity var(--transition); }
  .site-footer__brand:hover { opacity: 1; }

  /* ---- 4.3 Hero ---------------------------------------------------------- */
  .hero {
    min-height: 100vh; display: flex; align-items: center;
    position: relative; border-bottom: 1px solid var(--border-muted);
  }
  .hero__content { grid-column: 2 / span 10; text-align: center; z-index: 1; }
  .hero__title {
    font-family: var(--ff-display); font-size: var(--fs-h1); font-weight: 800;
    letter-spacing: -0.04em; line-height: 0.85; margin-bottom: 30px;
  }
  .hero__clarity {
    font-size: clamp(18px, 1.8vw, 24px); font-weight: 600; color: var(--sky);
    margin-bottom: 20px; letter-spacing: -0.02em;
  }
  .hero__desc { font-size: var(--fs-body); color: var(--slate); max-width: 600px; margin: 0 auto; font-weight: 300; }

  /* ---- 4.4 Section header ------------------------------------------------ */
  .section { padding: var(--space-section) 0; border-bottom: 1px solid var(--border-muted); }
  .section--plain { border-bottom: 0; }
  .section-head { grid-column: span 12; margin-bottom: 60px; }
  .eyebrow {
    font-family: var(--ff-mono); color: var(--gold); font-size: 12px;
    letter-spacing: 3px; display: block; margin-bottom: 15px; text-transform: uppercase;
  }
  .eyebrow--sky { color: var(--sky); }
  .section-head h2 { font-family: var(--ff-display); font-size: var(--fs-h2); font-weight: 800; letter-spacing: -0.04em; }

  /* ---- 4.5 Cards --------------------------------------------------------- */
  .card-grid { grid-column: span 12; display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }

  .card {
    display: flex; flex-direction: column;
    border: 1px solid var(--border-muted);
    text-decoration: none; color: inherit;
    transition: transform 0.4s var(--ease-out-expo), border-color var(--transition), background var(--transition);
  }
  .card:hover { border-color: var(--gold); transform: translateY(-10px); }

  /* Text-only insight card (home) */
  .card--insight { background: var(--surface-2); padding: 45px; min-height: 400px; }
  .card--insight:hover { background: var(--surface-3); }
  .card--insight h3 { font-family: var(--ff-display); font-size: var(--fs-h3); font-weight: 700; line-height: 1.25; margin-bottom: 15px; }
  .card--insight p { font-size: var(--fs-small); color: var(--slate); line-height: 1.6; }

  /* Media card (insights hub) */
  .card--media { padding: 30px; }
  .card--media:hover { transform: translateY(-5px); }
  .card--media:hover h3 { color: var(--gold); }
  .card--media h3 { font-family: var(--ff-display); font-size: 19px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; transition: color var(--transition); }
  .card--media p { font-size: 13px; color: var(--slate); }

  /* Related card (article footer) */
  .card--related { padding: 25px; background: var(--surface-1); }
  .card--related:hover { transform: none; background: var(--surface-3); }
  .card--related h3 { font-family: var(--ff-display); font-size: 16px; font-weight: 700; margin-top: 8px; }

  .card__tag { font-family: var(--ff-mono); font-size: 9px; color: var(--gold); letter-spacing: 2px; margin-bottom: 25px; display: block; text-transform: uppercase; }
  .card__footer { margin-top: auto; font-family: var(--ff-mono); font-size: 10px; color: var(--sky); letter-spacing: 1px; padding-top: 20px; }

  .card__media { width: 100%; aspect-ratio: 4 / 3; overflow: hidden; margin-bottom: 25px; position: relative; }
  .card__img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) opacity(0.8); transition: transform 0.6s var(--ease-out-quart), filter 0.6s; }
  .card:hover .card__img { transform: scale(1.03); filter: grayscale(0.2); }

  .tag-row { display: flex; gap: 12px; margin-bottom: 20px; font-family: var(--ff-mono); font-size: 10px; align-items: center; }
  .tag-row .category { color: var(--sky); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }
  .tag-row .lang-tag { color: var(--gold); border: 1px solid rgba(184, 147, 85, 0.3); padding: 2px 8px; }
  .meta-text { font-family: var(--ff-mono); font-size: 10px; color: var(--gold); letter-spacing: 1px; opacity: 0.85; }

  /* ---- 4.6 Buttons ------------------------------------------------------- */
  .btn {
    display: inline-block; padding: 20px 50px;
    font-family: var(--ff-mono); font-size: 13px; font-weight: 600; letter-spacing: 1px;
    border: 1px solid transparent; text-align: center; transition: all var(--transition);
    cursor: pointer;
  }
  .btn--primary { background: var(--gold); color: var(--white); border-color: var(--gold); }
  .btn--primary:hover { background: transparent; color: var(--gold); }
  .btn--ghost { border-color: var(--gold); color: var(--white); }
  .btn--ghost:hover { background: var(--gold); color: var(--deep-navy); }
  .btn--dark { background: var(--deep-navy); color: var(--white); padding: 18px 40px; }
  .btn--dark:hover { background: var(--gold); transform: translateY(-3px); }
  .btn--soft { border-color: var(--white); color: var(--white); }
  .btn--soft:hover { background: var(--white); color: var(--deep-navy); }

  .text-link {
    font-family: var(--ff-mono); font-size: 12px; color: var(--white);
    border-bottom: 1px solid var(--gold); padding-bottom: 5px; transition: color var(--transition);
  }
  .text-link:hover { color: var(--gold); }

  /* ---- 4.7 Diagnostic quiz ----------------------------------------------- */
  .quiz {
    grid-column: 3 / span 8;
    background: var(--surface-1); border: 1px solid var(--border-muted);
    padding: 60px; position: relative;
  }
  .quiz__progress-wrap { margin-bottom: 40px; }
  .quiz__progress-track { height: 2px; background: rgba(255, 255, 255, 0.1); width: 100%; margin-bottom: 15px; position: relative; }
  .quiz__progress-bar { height: 100%; background: var(--gold); transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); width: 20%; }
  .quiz__progress-text { font-family: var(--ff-mono); font-size: var(--fs-mono); color: var(--slate); letter-spacing: 1px; }

  .quiz__step { display: none; }
  .quiz__step.is-active { display: block; animation: fadeUp 0.4s ease forwards; }
  @keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

  .layer-tag { font-family: var(--ff-mono); font-size: 10px; color: var(--gold); letter-spacing: 2px; margin-bottom: 20px; display: block; }
  .quiz__step h2 { font-family: var(--ff-display); font-size: 28px; font-weight: 800; margin-bottom: 40px; line-height: 1.2; letter-spacing: -1px; }

  .options { display: flex; flex-direction: column; gap: 12px; margin-bottom: 40px; }
  .option {
    background: var(--surface-2); border: 1px solid var(--border-muted);
    padding: 20px; cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; gap: 15px;
  }
  .option:hover { border-color: var(--sky); background: var(--sky-wash); }
  .option input { accent-color: var(--gold); }

  .quiz__controls { display: flex; gap: 15px; }
  .btn-nav { font-family: var(--ff-mono); font-size: 12px; font-weight: 600; padding: 15px 35px; border: 1px solid transparent; cursor: pointer; transition: var(--transition); }
  .btn-nav--next { background: var(--gold); color: var(--white); }
  .btn-nav--next:hover { background: var(--gold-deep); }
  .btn-nav--back { background: transparent; border-color: var(--border-muted); color: var(--slate); }
  .btn-nav--back:hover { color: var(--white); border-color: var(--white); }

  /* ---- 4.8 Result / Structural Maturity Index ---------------------------- */
  .smi-header { grid-column: span 12; background: var(--surface-2); border: 1px solid var(--border-muted); padding: 60px; position: relative; }
  .score-badge { font-family: var(--ff-mono); color: var(--gold); font-size: 11px; letter-spacing: 3px; margin-bottom: 15px; display: block; text-transform: uppercase; }
  .score-badge--sky { color: var(--sky); }
  .smi-header h1 { font-family: var(--ff-display); font-weight: 800; letter-spacing: -1px; line-height: 1; }
  .smi-level { font-family: var(--ff-display); font-size: clamp(28px, 4vw, 48px); font-weight: 800; letter-spacing: -2px; line-height: 1; margin-top: 8px; }
  .smi-index { margin-top: 10px; font-size: 13px; color: var(--sky); font-family: var(--ff-mono); }
  .trust-layer { font-size: 11px; color: var(--slate); margin-top: 15px; font-family: var(--ff-mono); opacity: 0.6; }
  .smi-narrative { margin-top: 25px; color: rgba(255, 255, 255, 0.7); font-size: 18px; font-weight: 300; }

  .breakdown-zone { grid-column: span 12; display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; margin: 20px 0; }
  .layer-stat { background: var(--surface-1); padding: 25px; border: 1px solid var(--border-muted); text-align: center; position: relative; }
  .layer-stat > span { font-size: 13px; color: var(--slate); }
  .bar-container { height: 100px; width: 6px; background: rgba(255, 255, 255, 0.05); margin: 20px auto; position: relative; border-radius: 10px; }
  .bar-fill { position: absolute; bottom: 0; left: 0; width: 100%; background: var(--gold); transition: height 1s ease-out; border-radius: 10px; height: 0; }
  .secondary-label { position: absolute; top: -10px; left: 50%; transform: translateX(-50%); background: var(--sky); color: var(--white); font-size: 8px; padding: 4px 8px; font-weight: 800; border-radius: var(--radius-pill); display: none; white-space: nowrap; }

  .analysis-zone { grid-column: span 12; display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .constraint-box { background: var(--gold-wash); border: 1px solid var(--border-muted); padding: 40px; border-left: 4px solid var(--gold); }
  .analysis-box { background: var(--surface-2); border: 1px solid var(--border-muted); padding: 40px; }
  .impact-box { margin-top: 20px; color: var(--urgent-red); font-size: 14px; font-weight: 700; border-top: 1px solid rgba(255, 107, 107, 0.2); padding-top: 15px; }
  .cross-layer { margin-top: 15px; font-size: 13px; color: #aaa; font-style: italic; }
  .curiosity-gap { margin-top: 15px; font-size: 13px; color: var(--slate); border-top: 1px dashed var(--border-muted); padding-top: 15px; }
  .quick-fix { margin-top: 15px; font-family: var(--ff-mono); font-size: 14px; border: 1px solid var(--gold); padding: 15px; }

  .funnel-zone { grid-column: 3 / span 8; margin-top: 80px; text-align: center; border: 1px solid var(--gold); padding: 80px 40px; }
  .email-form { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; max-width: 600px; margin: 30px auto 0; }
  .email-form input { padding: 18px; background: transparent; border: 1px solid var(--border-muted); color: var(--white); outline: none; font-family: var(--ff-body); }
  .email-form input:focus { border-color: var(--gold); }
  .btn-submit { grid-column: span 2; background: var(--gold); border: none; padding: 18px; color: var(--white); font-family: var(--ff-mono); font-weight: 700; cursor: pointer; transition: var(--transition); margin-top: 10px; }
  .btn-submit:hover { background: var(--gold-deep); transform: translateY(-2px); }
  .form-status { grid-column: span 2; font-family: var(--ff-mono); font-size: 12px; margin-top: 12px; min-height: 1em; }
  .form-status--ok { color: var(--sky); }
  .form-status--err { color: var(--urgent-red); }

  .redirect-warning { display: none; text-align: center; margin-top: 15vh; grid-column: span 12; }
  .redirect-warning h2 { font-family: var(--ff-display); font-size: 32px; margin-bottom: 20px; }

  /* ---- 4.9 Article prose ------------------------------------------------- */
  .article-header { grid-column: 2 / span 10; margin-top: 80px; }
  .back-link { font-family: var(--ff-mono); font-size: 11px; color: var(--gold); letter-spacing: 1px; transition: opacity var(--transition); }
  .back-link:hover { opacity: 0.7; }
  .meta-row { font-family: var(--ff-mono); font-size: 11px; color: var(--slate); margin-top: 30px; display: flex; gap: 20px; flex-wrap: wrap; }
  .article-header h1 { font-family: var(--ff-display); font-size: var(--fs-h1-page); font-weight: 800; letter-spacing: -0.04em; line-height: 1.05; margin-top: 20px; }
  .byline { font-family: var(--ff-mono); font-size: 12px; color: var(--slate); margin-top: 20px; }
  .byline b { color: var(--white); font-weight: 600; }

  .cover-container { grid-column: 2 / span 10; margin: 60px 0; position: relative; overflow: hidden; border-radius: var(--radius); border: 1px solid var(--border-muted); }
  .cover-img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; filter: grayscale(0.6) brightness(0.85) contrast(1.05); transition: transform 0.6s var(--ease-out-quart); }
  .cover-container:hover .cover-img { transform: scale(1.02); }
  .cover-container::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(15, 17, 37, 0.1), rgba(15, 17, 37, 0.5)); pointer-events: none; }

  /* Lead / definitional opener */
  .lead { grid-column: 3 / span 8; max-width: 760px; font-size: 21px; line-height: 1.6; color: var(--white); font-weight: 400; margin-top: 10px; }

  .briefing { grid-column: 3 / span 8; background: var(--surface-2); border-left: 2px solid var(--gold); padding: 40px; margin: 40px 0 20px; }
  .briefing__label { font-family: var(--ff-mono); font-size: 11px; color: var(--gold); margin-bottom: 15px; letter-spacing: 2px; }
  .briefing p { font-size: 17px; opacity: 0.9; line-height: 1.5; }

  /* Key Takeaways (GEO TL;DR) */
  .takeaways { grid-column: 3 / span 8; background: var(--surface-2); border: 1px solid var(--border-muted); border-top: 3px solid var(--gold); padding: 35px 40px; margin: 40px 0; max-width: 760px; }
  .takeaways h2 { font-family: var(--ff-display); font-size: 20px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 20px; }
  .takeaways ul { list-style: none; display: grid; gap: 14px; }
  .takeaways li { position: relative; padding-left: 26px; font-size: 16px; line-height: 1.5; color: rgba(255, 255, 255, 0.85); }
  .takeaways li::before { content: "→"; position: absolute; left: 0; color: var(--gold); font-family: var(--ff-mono); }

  .prose { grid-column: 3 / span 8; font-size: 18px; color: rgba(255, 255, 255, 0.8); font-weight: 300; max-width: 760px; line-height: 1.8; }
  .prose h2 { font-family: var(--ff-display); font-size: 26px; font-weight: 800; color: var(--white); margin-top: 70px; margin-bottom: 15px; letter-spacing: -1px; line-height: 1.2; }
  .prose h3 { font-family: var(--ff-display); font-size: 20px; font-weight: 700; color: var(--white); margin-top: 40px; margin-bottom: 12px; letter-spacing: -0.5px; }
  .prose p { margin-bottom: 25px; }
  .prose ul, .prose ol { margin: 0 0 25px 22px; }
  .prose li { margin-bottom: 10px; }
  .prose strong { color: var(--white); font-weight: 600; }
  .prose a { color: var(--sky); text-decoration: underline; text-underline-offset: 3px; }

  /* Five-layer canonical definition list (proprietary IP block) */
  .layer-model { grid-column: 3 / span 8; max-width: 760px; margin: 30px 0; border-top: 1px solid var(--border-muted); }
  .layer-model div { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--border-muted); }
  .layer-model dt { font-family: var(--ff-mono); font-size: 12px; color: var(--gold); letter-spacing: 1px; }
  .layer-model dd { font-size: 15px; color: rgba(255, 255, 255, 0.8); }

  /* FAQ */
  .faq { grid-column: 3 / span 8; max-width: 760px; margin-top: 30px; }
  .faq__item { border-bottom: 1px solid var(--border-muted); padding: 24px 0; }
  .faq__item h3 { font-family: var(--ff-display); font-size: 18px; font-weight: 700; color: var(--white); margin-bottom: 10px; }
  .faq__item p { font-size: 16px; color: rgba(255, 255, 255, 0.75); line-height: 1.6; }

  /* Author / E-E-A-T block */
  .author-box { grid-column: 3 / span 8; max-width: 760px; margin-top: 40px; background: var(--surface-2); border: 1px solid var(--border-muted); padding: 35px 40px; display: flex; gap: 25px; align-items: flex-start; }
  .author-box__avatar { width: 64px; height: 64px; border-radius: 50%; background: var(--gold-wash); border: 1px solid var(--gold); flex-shrink: 0; display: grid; place-items: center; font-family: var(--ff-brand); font-weight: 700; color: var(--gold); }
  .author-box h2 { font-family: var(--ff-display); font-size: 18px; font-weight: 800; margin-bottom: 6px; }
  .author-box p { font-size: 14px; color: var(--slate); line-height: 1.6; }
  .author-box a { color: var(--sky); }

  .diagnostic-footer-cta { grid-column: 3 / span 8; background: var(--white); color: var(--deep-navy); padding: 50px; margin: 80px 0; border-radius: var(--radius); max-width: 760px; }
  .diagnostic-footer-cta h2 { font-family: var(--ff-display); font-size: 26px; font-weight: 800; margin-bottom: 15px; letter-spacing: -1px; }
  .diagnostic-footer-cta p { color: var(--slate); font-size: 15px; margin-bottom: 30px; line-height: 1.5; }

  .related-zone { grid-column: 3 / span 8; margin-top: 40px; border-top: 1px solid var(--border-muted); padding-top: 60px; max-width: 760px; }
  .related-zone h2 { font-family: var(--ff-display); font-size: 20px; margin-bottom: 30px; letter-spacing: -1px; }
  .related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }

  /* Reading progress bar (article) */
  .reading-progress { position: absolute; bottom: 0; left: 0; height: 2px; background: var(--gold); width: 0%; transition: width 0.2s ease-out; }

  /* ---- 4.10 Insights hub specifics --------------------------------------- */
  .hub-header { grid-column: span 12; margin-top: 80px; position: relative; }
  .hub-header h1 { font-family: var(--ff-display); font-size: var(--fs-h1-page); font-weight: 800; letter-spacing: -0.04em; line-height: 1; margin-bottom: 25px; }
  .intro { grid-column: span 9; color: var(--slate); font-size: 18px; font-weight: 300; max-width: 800px; }

  .filter-bar { grid-column: span 12; margin-top: 40px; padding: 25px 0; border-top: 1px solid var(--border-muted); border-bottom: 1px solid var(--border-muted); display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
  .filter-label { font-family: var(--ff-mono); font-size: 11px; color: var(--slate); letter-spacing: 1px; }
  .filter-btn { font-family: var(--ff-mono); font-size: 11px; color: var(--slate); background: transparent; border: 1px solid transparent; cursor: pointer; transition: var(--transition); padding: 5px 12px; text-transform: uppercase; }
  .filter-btn:hover, .filter-btn.is-active { color: var(--white); border-color: var(--gold); }
  .clear-btn { font-size: 10px; color: var(--gold); opacity: 0.6; cursor: pointer; margin-left: auto; font-family: var(--ff-mono); background: none; border: none; letter-spacing: 1px; }
  .clear-btn:hover { opacity: 1; }

  .featured { grid-column: 2 / span 10; margin-top: 70px; }
  .featured__link { display: grid; grid-template-columns: repeat(10, 1fr); gap: 40px; text-decoration: none; color: inherit; border: 1px solid var(--border-muted); padding: 30px; transition: transform 0.4s, border-color var(--transition); background: var(--surface-1); }
  .featured__link:hover { border-color: var(--gold); transform: translateY(-4px); }
  .featured__media { grid-column: span 5; overflow: hidden; position: relative; }
  .featured__img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; filter: grayscale(1) brightness(0.7); transition: transform 0.6s var(--ease-out-quart), filter 0.6s; }
  .featured__link:hover .featured__img { transform: scale(1.05); filter: grayscale(0.5) brightness(0.9); }
  .featured__body { grid-column: span 5; display: flex; flex-direction: column; padding: 10px 0 10px 10px; }
  .featured__body h2 { font-family: var(--ff-display); font-size: 26px; font-weight: 800; letter-spacing: -0.04em; line-height: 1.05; margin-bottom: 18px; }
  .featured__body p { font-size: 14px; color: var(--slate); line-height: 1.6; margin-bottom: 30px; }
  .featured__body .meta-text { margin-top: auto; }

  .insight-grid { grid-column: span 12; display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 60px; }

  .diagnostic-cta { grid-column: span 12; margin: 120px 0; text-align: center; border-top: 1px solid var(--border-muted); padding-top: 100px; }
  .diagnostic-cta h2 { font-family: var(--ff-display); font-size: 32px; font-weight: 800; margin-bottom: 30px; letter-spacing: -1.5px; }

  /* Centered CTA block (home diagnostic teaser) */
  .cta-block { text-align: center; }
  .cta-block h2 { font-family: var(--ff-display); font-size: 32px; font-weight: 800; letter-spacing: -1px; margin-bottom: 20px; }
  .cta-block p { margin-bottom: 40px; }

  /* ---- 4.11 Diagnostic intro (start page) -------------------------------- */
  .diag-intro { grid-column: 3 / span 8; text-align: center; margin-bottom: 40px; }
  .diag-intro h1 { font-family: var(--ff-display); font-size: var(--fs-h1-page); font-weight: 800; letter-spacing: -2px; margin-bottom: 20px; }
  .diag-intro p { color: var(--slate); font-size: 16px; max-width: 640px; margin: 0 auto; }

  /* ---- 4.12 Language chooser (root) -------------------------------------- */
  .chooser { min-height: 100vh; display: grid; place-items: center; text-align: center; padding: 40px; }
  .chooser__inner { max-width: 480px; }
  .chooser__brand { font-family: var(--ff-brand); font-size: 28px; font-weight: 700; letter-spacing: -1px; margin-bottom: 30px; }
  .chooser__title { font-family: var(--ff-display); font-size: 22px; font-weight: 700; margin-bottom: 40px; color: var(--slate); }
  .chooser__links { display: flex; gap: 20px; justify-content: center; }
}

/* =============================================================================
   5. UTILITIES
   ========================================================================== */
@layer utilities {
  .u-hidden { display: none !important; }
  .u-center { text-align: center; }
  .u-mt-section { margin-top: 60px; }
  .u-mt-lg { margin-top: 30px; }
  .u-muted { color: var(--slate); }
  .u-fineprint { font-family: var(--ff-mono); font-size: 10px; color: var(--slate); opacity: 0.6; }

  .u-visually-hidden {
    position: absolute !important; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0);
    white-space: nowrap; border: 0;
  }
}

/* =============================================================================
   6. RESPONSIVE  (component-scoped overrides, breakpoints 1024 / 900 / 768)
   ========================================================================== */
@layer components {
  @media (max-width: 1024px) {
    .hero__content { grid-column: span 12; }
    .card-grid { grid-template-columns: 1fr; }
    .featured, .featured__link { grid-column: span 12; grid-template-columns: 1fr; }
    .featured__media, .featured__body { grid-column: span 1; }
    .insight-grid { grid-template-columns: 1fr 1fr; }
    .article-header, .cover-container, .briefing, .takeaways, .prose, .layer-model,
    .faq, .author-box, .diagnostic-footer-cta, .related-zone, .lead { grid-column: 2 / span 10; }
    .funnel-zone { grid-column: 2 / span 10; }
  }

  @media (max-width: 900px) {
    .site-nav { padding: 20px 5%; }
    .site-nav__links { gap: 18px; }
    .quiz { grid-column: span 12; padding: 30px; }
    .breakdown-zone { grid-template-columns: repeat(5, 1fr); gap: 8px; }
    .layer-stat { padding: 14px 8px; }
    .analysis-zone { grid-template-columns: 1fr; }
    .diag-intro { grid-column: span 12; }
  }

  @media (max-width: 768px) {
    .insight-grid { grid-template-columns: 1fr; }
    .intro { grid-column: span 12; }
    .article-header, .cover-container, .briefing, .takeaways, .prose, .layer-model,
    .faq, .author-box, .diagnostic-footer-cta, .related-zone, .lead, .funnel-zone { grid-column: 1 / span 12; }
    .related-grid { grid-template-columns: 1fr; }
    .email-form { grid-template-columns: 1fr; }
    .email-form input, .btn-submit, .form-status { grid-column: span 1; }
    .site-nav__menu { gap: 16px; }
    .site-footer { flex-direction: column; align-items: flex-start; }
    .layer-model div { grid-template-columns: 1fr; gap: 4px; }
    .author-box { flex-direction: column; }
  }
}

/* =============================================================================
   7. T10 ADDITIONS — contact form (about pages)
   Appended, not interleaved with the sections above, so nothing above this
   line changes byte-for-byte (parity gate). `.contact-form` styles a
   `<textarea>` and a full-width field, layered on top of the EXISTING
   `.email-form` grid/input rules (section 4 above) that the component
   already reuses as-is — see `src/components/public/ContactForm.tsx`.
   ========================================================================== */
@layer components {
  .contact-form textarea {
    grid-column: span 2;
    padding: 18px;
    background: transparent;
    border: 1px solid var(--border-muted);
    color: var(--white);
    outline: none;
    font-family: var(--ff-body);
    resize: vertical;
    min-height: 120px;
  }
  .contact-form textarea:focus { border-color: var(--gold); }
  .contact-form__full { grid-column: span 2; }

  @media (max-width: 768px) {
    .contact-form textarea, .contact-form__full { grid-column: span 1; }
  }
}