/* ============================================================
         Design Tokens
         ============================================================ */
      :root {
        --ink: #0f172a;
        --ink-soft: #1e293b;
        --paper: #f8fbff;
        --paper-warm: #eff6ff;
        --paper-warmer: #e0f2fe;
        --line: #bfdbfe;
        --line-soft: #dbeafe;
        --muted: #475569;
        --muted-soft: #64748b;

        --accent: #1d4ed8;
        --accent-soft: #eaf4ff;
        --accent-line: #7dd3fc;
        --accent-bright: #0ea5e9;

        --warning: #ef4444;
        --warning-soft: #fee2e2;

        --gold: #f59e0b;
        --gold-soft: #fff7d6;

        --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(37, 99, 235, 0.08);
        --shadow-md: 0 10px 24px -18px rgba(15, 23, 42, 0.28), 0 8px 18px -14px rgba(14, 165, 233, 0.24);
        --shadow-lg: 0 24px 70px -34px rgba(37, 99, 235, 0.42), 0 18px 48px -28px rgba(15, 23, 42, 0.28);

        --radius-sm: 6px;
        --radius-md: 8px;
        --radius-lg: 16px;
        --radius-xl: 24px;

        --font-display: "Noto Serif Thai", "Sarabun", Georgia, serif;
        --font-body: "Sarabun", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        --font-mono: "Sarabun", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      }

      /* ============================================================
         Base
         ============================================================ */
      *, *::before, *::after { box-sizing: border-box; }
      html { scroll-behavior: smooth; }
      body {
        margin: 0;
        font-family: var(--font-body);
        font-feature-settings: "ss01", "ss02", "cv11";
        background:
          linear-gradient(180deg, rgba(239, 246, 255, 0.96) 0%, rgba(248, 251, 255, 1) 38%, rgba(255, 255, 255, 1) 100%);
        color: var(--ink);
        line-height: 1.6;
        font-size: 16px;
        overflow-x: hidden;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
      }
      :lang(th) {
        font-family: "Sarabun", var(--font-body);
        line-height: 1.75;
      }
      ::selection { background: var(--accent); color: var(--paper); }

      h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; letter-spacing: 0; line-height: 1.15; margin: 0; }
      :lang(th) h1, :lang(th) h2, :lang(th) h3, :lang(th) h4 {
        font-family: "Noto Serif Thai", var(--font-display);
        font-weight: 700;
        letter-spacing: 0;
      }
      p { margin: 0; }
      a { color: inherit; text-decoration: none; }
      button { font-family: inherit; cursor: pointer; border: none; background: none; }
      input, textarea, select { font-family: inherit; font-size: inherit; }

      /* ============================================================
         Layout primitives
         ============================================================ */
      .container { max-width: 1360px; margin: 0 auto; padding: 0 24px; }
      @media (min-width: 768px) { .container { padding: 0 40px; } }

      .stack > * + * { margin-top: var(--gap, 16px); }

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

      /* ============================================================
         Header
         ============================================================ */
      .site-header {
        position: fixed; top: 0; left: 0; right: 0; z-index: 50;
        background: linear-gradient(90deg, rgba(7, 89, 133, 0.95), rgba(29, 78, 216, 0.96));
        backdrop-filter: saturate(180%) blur(20px);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        border-bottom: 3px solid #38bdf8;
        box-shadow: 0 14px 36px -28px rgba(15, 23, 42, 0.7);
      }
      .site-header__inner {
        display: flex; align-items: center; justify-content: space-between;
        height: 72px;
      }
      .logo { display: flex; align-items: center; gap: 10px; min-width: 0; }
      .logo__mark {
        width: 44px; height: 44px; flex: 0 0 44px;
        background: rgba(255, 255, 255, 0.95);
        color: var(--accent);
        display: grid; place-items: center;
        border-radius: 999px;
        border: 2px solid rgba(255, 255, 255, 0.82);
        box-shadow: 0 8px 22px -14px rgba(255, 255, 255, 0.75);
        overflow: hidden;
      }
      .logo__img {
        width: 38px;
        height: 38px;
        object-fit: contain;
      }
      .logo__text {
        display: flex;
        flex-direction: column;
        min-width: 0;
        line-height: 1.15;
      }
      .logo__title {
        font-family: var(--font-display);
        font-weight: 700;
        font-size: 17px;
        letter-spacing: 0;
        color: #ffffff;
        white-space: nowrap;
      }
      .logo__subtitle {
        font-family: var(--font-body);
        font-size: 11px;
        font-weight: 400;
        color: rgba(255, 255, 255, 0.72);
        white-space: nowrap;
      }
      .nav { display: none; align-items: center; justify-content: center; gap: 3px; min-width: 0; }
      @media (min-width: 1120px) { .nav { display: flex; flex: 1; } }
      .nav a {
        font-family: var(--font-body);
        font-size: 13px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.84);
        padding: 8px 9px;
        border-radius: var(--radius-sm);
        transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
        white-space: nowrap;
      }
      .nav a:hover,
      .nav a:focus-visible {
        color: #ffffff;
        background: rgba(255, 255, 255, 0.12);
        transform: translateY(-1px);
      }

      .header-actions { display: flex; align-items: center; gap: 12px; }
      .lang-switch {
        display: inline-flex; padding: 3px;
        background: rgba(255, 255, 255, 0.12); border: 1px solid rgba(255, 255, 255, 0.26);
        border-radius: 100px;
      }
      .lang-switch button {
        padding: 6px 12px; font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
        color: rgba(255, 255, 255, 0.74); border-radius: 100px;
        transition: all 0.2s ease;
      }
      .lang-switch button[aria-pressed="true"] {
        background: #ffffff; color: var(--accent);
      }

      /* ============================================================
         Hero
         ============================================================ */
      .hero {
        position: relative; padding: 140px 0 88px;
        overflow: hidden;
      }
      .hero::before {
        content: "";
        position: absolute; inset: 0; z-index: 0;
        background-image:
          radial-gradient(circle at 18% 4%, rgba(56, 189, 248, 0.22) 0%, transparent 42%),
          radial-gradient(circle at 82% 18%, rgba(29, 78, 216, 0.16) 0%, transparent 48%),
          linear-gradient(180deg, rgba(239, 246, 255, 0.86), rgba(248, 251, 255, 0.98));
        pointer-events: none;
      }
      .hero::after {
        content: "";
        position: absolute; inset: 0; z-index: 0;
        background-image:
          linear-gradient(to right, rgba(37, 99, 235, 0.06) 1px, transparent 1px),
          linear-gradient(to bottom, rgba(14, 165, 233, 0.06) 1px, transparent 1px);
        background-size: 56px 56px;
        mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
        -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
        pointer-events: none;
      }
      .hero__inner { position: relative; z-index: 1; }

      .hero__eyebrow {
        display: inline-flex; align-items: center; gap: 10px;
        padding: 6px 14px;
        background: var(--paper);
        border: 1px solid var(--line-soft);
        border-radius: 100px;
        font-size: 11px; font-weight: 600; letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--accent-bright);
        margin-bottom: 28px;
      }
      .hero__eyebrow .pulse {
        position: relative; width: 6px; height: 6px;
        background: var(--accent-bright); border-radius: 50%;
      }
      .hero__eyebrow .pulse::after {
        content: ""; position: absolute; inset: -4px;
        border: 2px solid var(--accent-bright); border-radius: 50%;
        opacity: 0.5; animation: pulse 2s ease-out infinite;
      }
      @keyframes pulse {
        0% { transform: scale(0.5); opacity: 0.7; }
        100% { transform: scale(1.6); opacity: 0; }
      }

      .hero__title {
        font-size: clamp(2.4rem, 5.5vw, 4.5rem);
        max-width: 18ch;
        margin: 0 0 24px;
      }
      .hero__title em {
        font-style: normal;
        color: var(--accent);
        font-weight: 700;
      }
      :lang(th) .hero__title em { font-style: normal; }
      .hero__sub {
        font-size: clamp(1rem, 1.5vw, 1.15rem);
        color: var(--muted);
        max-width: 56ch;
        margin: 0 0 0;
      }

      .hero__center { text-align: center; max-width: 800px; margin: 0 auto; }

      /* ============================================================
         App Card
         ============================================================ */
      .app-card {
        position: relative; z-index: 2;
        max-width: 820px; margin: 56px auto 0;
        background: rgba(255, 255, 255, 0.92);
        border: 1px solid var(--line);
        border-radius: var(--radius-xl);
        padding: 24px;
        box-shadow: var(--shadow-lg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
      }
      @media (min-width: 640px) { .app-card { padding: 40px; } }

      /* Drop zone */
      .dropzone {
        position: relative;
        border: 2px dashed #93c5fd;
        border-radius: var(--radius-lg);
        padding: 56px 24px;
        text-align: center;
        cursor: pointer;
        background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      }
      .dropzone:hover, .dropzone:focus-within {
        border-color: var(--accent);
        background: linear-gradient(180deg, #dbeafe 0%, #f8fbff 100%);
        box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12), var(--shadow-md);
      }
      .dropzone--active {
        border-color: var(--accent) !important;
        background: linear-gradient(180deg, #dbeafe 0%, #f8fbff 100%) !important;
        transform: scale(1.01);
      }
      .dropzone input[type="file"] {
        position: absolute; inset: 0; width: 100%; height: 100%;
        opacity: 0; cursor: pointer;
      }
      .dropzone__icons {
        display: inline-flex; gap: 6px; margin-bottom: 24px;
      }
      .dropzone__icon {
        width: 70px; height: 84px;
        display: grid; place-items: center;
        background: linear-gradient(180deg, #ffffff, #eff6ff);
        border: 1px solid var(--line);
        border-radius: 10px;
        font-size: 15px; font-weight: 800; letter-spacing: 0.04em;
        color: var(--muted);
        position: relative;
        transition: all 0.3s ease;
      }
      .dropzone__icon::before {
        content: ""; position: absolute; top: -1px; right: -1px;
        width: 10px; height: 10px;
        background: #dbeafe;
        border-left: 1px solid var(--line-soft);
        border-bottom: 1px solid var(--line-soft);
        border-radius: 0 0 0 3px;
      }
      .dropzone__icon[data-type="pdf"] { color: var(--accent); }

      .dropzone:hover .dropzone__icon:nth-child(1) { transform: translateY(-3px); }

      .dropzone__title {
        font-size: 22px; font-weight: 600; letter-spacing: -0.01em;
        color: var(--ink); margin-bottom: 8px;
      }
      .dropzone__sub {
        font-size: 13px; color: var(--muted);
      }

      /* File summary row */
      .file-row {
        display: flex; align-items: center; justify-content: space-between;
        padding: 16px;
        background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-md);
        margin-bottom: 32px;
      }
      .file-row__main { display: flex; align-items: center; gap: 14px; min-width: 0; flex: 1; }
      .file-row__icon {
        width: 44px; height: 44px; flex-shrink: 0;
        display: grid; place-items: center;
        background: #ffffff; border: 1px solid var(--line);
        border-radius: 8px;
        font-family: var(--font-mono);
        font-size: 11px; font-weight: 600; letter-spacing: 0.04em;
      }
      .file-row__name {
        font-size: 14px; font-weight: 600; color: var(--ink);
        white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
      }
      .file-row__meta {
        font-size: 12px; color: var(--muted); margin-top: 2px;
        font-variant-numeric: tabular-nums;
      }
      .file-row__action {
        font-size: 12px; font-weight: 600; color: var(--muted);
        padding: 8px 14px;
        background: var(--paper); border: 1px solid var(--line);
        border-radius: 6px;
        transition: all 0.2s ease;
        white-space: nowrap;
      }
      .file-row__action:hover { color: var(--ink); border-color: var(--ink); }

      /* Section labels */
      .section-label {
        font-size: 11px; font-weight: 700; letter-spacing: 0.1em;
        text-transform: uppercase; color: var(--muted-soft);
        margin-bottom: 14px;
      }

      /* Compression level grid */
      .level-grid {
        display: grid; gap: 10px;
        grid-template-columns: 1fr;
      }
      @media (min-width: 560px) { .level-grid { grid-template-columns: repeat(3, 1fr); } }
      @media (min-width: 560px) { .level-grid--2 { grid-template-columns: repeat(2, 1fr); } }

      .level-card {
        position: relative; cursor: pointer;
        display: block;
      }
      .level-card input { position: absolute; opacity: 0; pointer-events: none; }
      .level-card__inner {
        display: block;
        padding: 18px 16px;
        background: var(--paper);
        border: 1px solid var(--line);
        border-radius: var(--radius-md);
        text-align: left;
        transition: all 0.2s ease;
        height: 100%;
      }
      .level-card:hover .level-card__inner {
        border-color: var(--accent-bright);
        box-shadow: 0 10px 24px -18px rgba(37, 99, 235, 0.4);
      }
      .level-card input:checked + .level-card__inner {
        border-color: var(--accent);
        background: linear-gradient(135deg, var(--accent), #0ea5e9);
        color: var(--paper);
        box-shadow: 0 14px 30px -18px rgba(37, 99, 235, 0.65);
      }
      .level-card__num {
        display: block;
        font-family: var(--font-mono);
        font-size: 11px; font-weight: 500;
        color: var(--muted-soft);
        letter-spacing: 0.06em;
        margin-bottom: 8px;
      }
      .level-card input:checked + .level-card__inner .level-card__num {
        color: rgba(250, 250, 247, 0.5);
      }
      .level-card__name {
        display: block;
        font-family: var(--font-display);
        font-size: 18px; font-weight: 500;
        margin-bottom: 4px;
        letter-spacing: -0.01em;
      }
      :lang(th) .level-card__name {
        font-family: "Sarabun", var(--font-display);
        font-weight: 700; font-size: 16px;
      }
      .level-card__desc {
        display: block;
        font-size: 12px; color: var(--muted); line-height: 1.5;
      }
      .level-card input:checked + .level-card__inner .level-card__desc {
        color: rgba(250, 250, 247, 0.65);
      }

      /* Toggle option */
      .toggle-option {
        display: flex; align-items: flex-start; gap: 14px;
        padding: 16px;
        background: var(--paper-warm);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-md);
        cursor: pointer;
        transition: all 0.2s ease;
        margin-top: 12px;
      }
      .toggle-option:hover { border-color: var(--line); background: var(--paper-warmer); }
      .toggle-option__check {
        display: block;
        width: 20px; height: 20px;
        border: 1.5px solid var(--line);
        border-radius: 5px;
        background: var(--paper);
        flex-shrink: 0;
        margin-top: 2px;
        position: relative;
        transition: all 0.2s ease;
      }
      .toggle-option input { position: absolute; opacity: 0; pointer-events: none; }
      .toggle-option input:checked + .toggle-option__body .toggle-option__check {
        background: var(--accent); border-color: var(--accent);
      }
      .toggle-option input:checked + .toggle-option__body .toggle-option__check::after {
        content: ""; position: absolute; top: 3px; left: 6px;
        width: 4px; height: 8px;
        border: solid var(--paper); border-width: 0 1.5px 1.5px 0;
        transform: rotate(45deg);
      }
      .toggle-option__body { display: flex; gap: 14px; flex: 1; }
      .toggle-option__text { flex: 1; }
      .toggle-option__title { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 2px; }
      .toggle-option__sub { display: block; font-size: 12px; color: var(--muted); line-height: 1.5; }

      /* Primary action button */
      .btn-primary {
        width: 100%;
        padding: 18px 24px;
        background: linear-gradient(135deg, var(--accent), var(--accent-bright));
        color: var(--paper);
        font-size: 15px; font-weight: 600;
        letter-spacing: 0;
        border-radius: var(--radius-md);
        display: flex; align-items: center; justify-content: center; gap: 10px;
        transition: all 0.2s ease;
        margin-top: 28px;
        box-shadow: var(--shadow-md);
      }
      .btn-primary:hover {
        background: linear-gradient(135deg, #1e40af, #0284c7);
        transform: translateY(-1px);
        box-shadow: 0 12px 30px -16px rgba(37, 99, 235, 0.65);
      }
      .btn-primary:active { transform: translateY(0); }

      /* Progress */
      .progress {
        text-align: center; padding: 48px 16px;
      }
      .progress__spinner {
        position: relative;
        width: 64px; height: 64px;
        margin: 0 auto 28px;
      }
      .progress__spinner::before, .progress__spinner::after {
        content: ""; position: absolute; inset: 0;
        border-radius: 50%;
      }
      .progress__spinner::before {
        border: 3px solid var(--line-soft);
      }
      .progress__spinner::after {
        border: 3px solid transparent;
        border-top-color: var(--accent);
        border-right-color: var(--accent-bright);
        animation: spin 0.8s linear infinite;
      }
      @keyframes spin { to { transform: rotate(360deg); } }
      .progress__text {
        font-size: 16px; font-weight: 500; color: var(--ink);
        margin-bottom: 24px;
        font-variant-numeric: tabular-nums;
      }
      .progress__bar {
        max-width: 320px; height: 4px; margin: 0 auto;
        background: var(--paper-warmer); border-radius: 100px;
        overflow: hidden;
      }
      .progress__bar-fill {
        height: 100%; width: 0%;
        background: linear-gradient(90deg, var(--accent), var(--accent-bright));
        transition: width 0.3s ease;
        border-radius: 100px;
      }
      .progress__safe {
        font-size: 12px; color: var(--muted);
        margin-top: 20px;
        display: inline-flex; align-items: center; gap: 8px;
      }
      .progress__safe-dot {
        display: inline-block;
        width: 6px; height: 6px; border-radius: 50%;
        background: var(--accent-bright);
        box-shadow: 0 0 0 4px var(--accent-soft);
      }

      /* Result */
      .result { text-align: center; }
      .result__check {
        width: 56px; height: 56px;
        margin: 0 auto 24px;
        background: var(--accent-soft);
        border: 1.5px solid var(--accent-line);
        border-radius: 50%;
        display: grid; place-items: center;
      }
      .result__check svg {
        width: 24px; height: 24px;
        stroke: var(--accent);
        animation: drawCheck 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
      }
      @keyframes drawCheck {
        from { stroke-dashoffset: 30; }
        to { stroke-dashoffset: 0; }
      }
      .result__title {
        font-size: 28px; margin-bottom: 8px;
      }
      .result__subtitle {
        font-size: 14px; color: var(--muted); margin-bottom: 32px;
      }

      .stat-grid {
        display: grid; grid-template-columns: repeat(3, 1fr);
        gap: 8px; margin-bottom: 32px;
      }
      .stat {
        padding: 18px 12px;
        background: var(--paper-warm);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-md);
      }
      .stat--highlight {
        background: var(--accent-soft);
        border-color: var(--accent-line);
      }
      .stat__label {
        font-size: 10px; font-weight: 700; letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--muted-soft);
        margin-bottom: 6px;
      }
      .stat--highlight .stat__label { color: var(--accent); }
      .stat__value {
        font-family: var(--font-display);
        font-size: clamp(20px, 4vw, 26px);
        font-weight: 500;
        color: var(--ink);
        font-variant-numeric: tabular-nums;
        letter-spacing: 0;
      }
      .stat--highlight .stat__value { color: var(--accent); font-style: italic; font-weight: 600; }
      :lang(th) .stat--highlight .stat__value { font-style: normal; }

      .result__actions {
        display: flex; gap: 10px; flex-direction: column;
      }
      @media (min-width: 560px) { .result__actions { flex-direction: row; } }
      .btn-secondary {
        flex: 1;
        padding: 14px 20px;
        background: var(--paper); border: 1px solid var(--line);
        color: var(--ink);
        font-size: 14px; font-weight: 600;
        border-radius: var(--radius-md);
        transition: all 0.2s ease;
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      }
      .btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
      .btn-download {
        flex: 2;
        padding: 14px 20px;
        background: linear-gradient(135deg, var(--accent), var(--accent-bright)); color: #ffffff;
        font-size: 14px; font-weight: 600;
        border-radius: var(--radius-md);
        transition: all 0.2s ease;
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
        box-shadow: 0 12px 30px -18px rgba(37, 99, 235, 0.65);
      }
      .btn-download:hover { background: linear-gradient(135deg, #1e40af, #0284c7); transform: translateY(-1px); }

      /* ============================================================
         Sections
         ============================================================ */
      .section { padding: 96px 0; }
      .section--alt { background: linear-gradient(180deg, #eff6ff, #ffffff); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
      .section--dark { background: linear-gradient(135deg, #0f3d8e, #075985); color: var(--paper); }

      .section-head { max-width: 720px; margin: 0 auto 64px; text-align: center; }
      .section-head__eyebrow {
        font-family: var(--font-mono);
        font-size: 11px; font-weight: 500; letter-spacing: 0.12em;
        text-transform: uppercase;
        color: var(--accent-bright); margin-bottom: 20px;
      }
      .section--dark .section-head__eyebrow { color: var(--gold); }
      .section-head__title {
        font-size: clamp(2rem, 4vw, 3rem);
        margin-bottom: 16px;
      }
      .section--dark .section-head__title { color: var(--paper); }
      .section-head__title em { font-style: normal; color: var(--accent); font-weight: 700; }
      :lang(th) .section-head__title em { font-style: normal; }
      .section--dark .section-head__title em { color: var(--gold); }
      .section-head__sub {
        font-size: 17px; color: var(--muted);
        max-width: 56ch; margin: 0 auto;
      }
      .section--dark .section-head__sub { color: rgba(250, 250, 247, 0.65); }

      /* Features grid */
      .features { display: grid; gap: 32px; grid-template-columns: 1fr; }
      @media (min-width: 768px) { .features { grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--radius-lg); overflow: hidden; } }

      .feature {
        padding: 36px 28px;
        background: var(--paper);
      }
      @media (min-width: 768px) { .feature { padding: 40px 32px; } }
      .feature__num {
        font-family: var(--font-mono);
        font-size: 11px; color: var(--muted-soft);
        letter-spacing: 0.08em;
        margin-bottom: 24px;
      }
      .feature__icon {
        width: 40px; height: 40px;
        margin-bottom: 24px;
        display: grid; place-items: center;
        color: var(--accent);
      }
      .feature__icon svg { width: 28px; height: 28px; }
      .feature__title {
        font-size: 22px; margin-bottom: 12px;
      }
      .feature__desc {
        font-size: 14px; color: var(--muted);
        line-height: 1.7;
      }

      /* Security split */
      .security-grid {
        display: grid; gap: 56px;
        grid-template-columns: 1fr;
        align-items: center;
      }
      @media (min-width: 900px) { .security-grid { grid-template-columns: 1fr 1fr; gap: 80px; } }

      .checklist { list-style: none; padding: 0; margin: 32px 0 0; }
      .checklist li {
        display: flex; align-items: flex-start; gap: 14px;
        padding: 14px 0;
        border-bottom: 1px solid rgba(250, 250, 247, 0.08);
        font-size: 15px;
      }
      .checklist li::before {
        content: ""; flex-shrink: 0; margin-top: 8px;
        width: 6px; height: 6px;
        background: var(--gold); border-radius: 50%;
      }

      /* Terminal */
      .terminal {
        background: rgba(15, 23, 42, 0.9);
        border: 1px solid rgba(125, 211, 252, 0.28);
        border-radius: var(--radius-lg);
        overflow: hidden;
        font-family: var(--font-mono);
      }
      .terminal__bar {
        display: flex; align-items: center; gap: 8px;
        padding: 14px 18px;
        background: rgba(14, 165, 233, 0.12);
        border-bottom: 1px solid rgba(125, 211, 252, 0.2);
      }
      .terminal__dot { display: inline-block; width: 11px; height: 11px; border-radius: 50%; }
      .terminal__dot--r { background: #ff5f56; }
      .terminal__dot--y { background: #ffbd2e; }
      .terminal__dot--g { background: #27c93f; }
      .terminal__name { margin-left: 12px; font-size: 11px; color: rgba(250,250,247,0.4); }
      .terminal__body { padding: 24px; font-size: 13px; line-height: 1.9; }
      .terminal__line { display: block; opacity: 0; animation: typeIn 0.4s ease forwards; }
      .terminal__line:nth-child(1) { animation-delay: 0.1s; }
      .terminal__line:nth-child(2) { animation-delay: 0.4s; }
      .terminal__line:nth-child(3) { animation-delay: 0.7s; }
      .terminal__line:nth-child(4) { animation-delay: 1.0s; }
      .terminal__line:nth-child(5) { animation-delay: 1.3s; }
      @keyframes typeIn { to { opacity: 1; } }
      .term-prompt { color: rgba(250,250,247,0.4); }
      .term-info { color: #88c0d0; }
      .term-success { color: #a3be8c; }
      .term-accent { color: #ebcb8b; }

      /* FAQ */
      .faq { max-width: 760px; margin: 0 auto; }
      .faq-item {
        border-bottom: 1px solid var(--line-soft);
        padding: 24px 0;
      }
      .faq-item:last-child { border-bottom: none; }
      .faq-item summary {
        cursor: pointer; list-style: none;
        display: flex; align-items: flex-start; justify-content: space-between;
        gap: 24px;
        font-family: var(--font-display);
        font-size: 19px; font-weight: 500;
        letter-spacing: 0;
        color: var(--ink);
      }
      :lang(th) .faq-item summary {
        font-family: "Sarabun", var(--font-body);
        font-weight: 600; font-size: 17px;
      }
      .faq-item summary::-webkit-details-marker { display: none; }
      .faq-item__plus {
        flex-shrink: 0; width: 24px; height: 24px;
        display: grid; place-items: center;
        font-size: 14px; color: var(--muted);
        transition: transform 0.3s ease;
      }
      .faq-item[open] .faq-item__plus { transform: rotate(45deg); color: var(--accent); }
      .faq-item__answer {
        margin-top: 16px;
        font-size: 15px; color: var(--muted); line-height: 1.7;
      }

      /* Footer */
      .footer {
        background: linear-gradient(180deg, #eff6ff, #dbeafe);
        border-top: 1px solid var(--line-soft);
        padding: 64px 0 32px;
      }
      .footer__grid {
        display: grid; gap: 48px;
        grid-template-columns: 1fr;
        margin-bottom: 48px;
      }
      @media (min-width: 768px) { .footer__grid { grid-template-columns: 2fr 1fr 1fr; } }
      .footer__about p {
        font-size: 14px; color: var(--muted);
        line-height: 1.7; margin-top: 16px; max-width: 40ch;
      }
      .footer .logo__text { color: var(--accent); }
      .footer .logo__mark {
        background: linear-gradient(135deg, var(--accent), var(--accent-bright));
        color: #ffffff;
        border-color: rgba(14, 165, 233, 0.28);
      }
      .footer__col h4 {
        font-family: var(--font-display);
        font-size: 14px; font-weight: 600;
        margin-bottom: 16px; color: var(--ink);
        letter-spacing: 0;
      }
      :lang(th) .footer__col h4 { font-family: "Sarabun", var(--font-body); font-weight: 700; }
      .footer__col ul { list-style: none; padding: 0; margin: 0; }
      .footer__col li { margin-bottom: 8px; }
      .footer__col a {
        font-size: 13px; color: var(--muted);
        transition: color 0.2s ease;
      }
      .footer__col a:hover { color: var(--accent); }
      .footer__bottom {
        padding-top: 32px; border-top: 1px solid var(--line-soft);
        font-size: 12px; color: var(--muted-soft);
        text-align: center;
      }

      /* Toast */
      .toast {
        position: fixed; top: 100px; right: 20px;
        z-index: 100;
        max-width: 360px;
        background: var(--paper);
        border: 1px solid var(--line);
        border-left: 4px solid var(--warning);
        border-radius: var(--radius-md);
        padding: 16px 18px;
        box-shadow: var(--shadow-lg);
        display: flex; align-items: flex-start; gap: 12px;
        transform: translateX(calc(100% + 40px));
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      }
      .toast.is-visible { transform: translateX(0); }
      .toast--success { border-left-color: var(--accent-bright); }
      .toast__icon { flex-shrink: 0; margin-top: 2px; }
      .toast__icon svg { width: 20px; height: 20px; }
      .toast--error .toast__icon { color: var(--warning); }
      .toast--success .toast__icon { color: var(--accent-bright); }
      .toast__title { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 2px; }
      .toast__msg { font-size: 13px; color: var(--muted); line-height: 1.5; }

      /* Utility */
      .u-hidden { display: none !important; }
      .u-flex { display: flex !important; }
      .u-center-x { margin-left: auto; margin-right: auto; }
      .u-min-w-0 { min-width: 0; flex: 1; }
      .u-text-left { text-align: left; }
      .u-section-sub-left { margin-left: 0; margin-top: 16px; text-align: left; }
      .u-flex-col-center { display: flex; flex-direction: column; justify-content: center; }
      .u-mb-md { margin-bottom: 18px; }
      .u-w-full { width: 100%; }
      .u-mt-sm { margin-top: 8px; }
      .u-mt-md { margin-top: 16px; }
      .u-mt-lg { margin-top: 28px; }

      /* Accessibility — respect users who prefer reduced motion */
      @media (prefers-reduced-motion: reduce) {
        *, *::before, *::after {
          animation-duration: 0.01ms !important;
          animation-iteration-count: 1 !important;
          transition-duration: 0.01ms !important;
          scroll-behavior: auto !important;
        }
      }