:root {
      --bg: #0a0e17;
      --surface: #12182a;
      --surface-2: #161f35;
      --line: #1e2d4a;
      --mint: #2eecc0;
      --mint-soft: rgba(46, 236, 192, 0.1);
      --mint-glow: 0 0 22px rgba(46, 236, 192, 0.22);
      --ember: #ff7a4d;
      --ember-soft: rgba(255, 122, 77, 0.12);
      --ink: #f2f6fc;
      --ink-2: #c5d0e0;
      --ink-3: #9aadc0;
      --gold: #fcd34d;
      --font: "Inter", system-ui, sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font); background: var(--bg); color: var(--ink);
      line-height: 1.65; font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image:
        radial-gradient(ellipse 70% 45% at 0% 0%, rgba(46, 236, 192, 0.07), transparent 55%),
        radial-gradient(ellipse 50% 35% at 100% 30%, rgba(255, 122, 77, 0.05), transparent 50%);
    }
    img { max-width: 100%; display: block; }
    a { color: var(--mint); text-decoration: none; font-weight: 500; }
    a:hover { color: #6ef8dc; }
    .shell { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

    /* —— Nav (match home tone) —— */
    .topbar {
      position: sticky; top: 0; z-index: 90;
      background: rgba(10, 14, 23, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--line);
    }
    .topbar-row {
      display: flex; align-items: center; justify-content: space-between;
      height: 60px; gap: 10px;
    }
    .brand img { height: 28px; }
    .menu { display: flex; gap: 2px; list-style: none; }
    .menu a {
      padding: 7px 13px; font-size: 0.84rem; font-weight: 500;
      color: var(--ink-3); border-radius: 8px; transition: 0.18s;
    }
    .menu a:hover, .menu a.on { color: var(--mint); background: var(--mint-soft); }
    .top-actions { display: flex; align-items: center; gap: 8px; }
    .btn-sm {
      display: inline-flex; align-items: center; justify-content: center;
      font-size: 0.78rem; font-weight: 700; padding: 9px 16px;
      border-radius: 9px; letter-spacing: 0.03em; transition: 0.18s; white-space: nowrap;
    }
    .btn-sm-ghost {
      border: 1px solid rgba(46, 236, 192, 0.4); color: var(--mint);
      background: rgba(46, 236, 192, 0.06);
    }
    .btn-sm-ghost:hover { background: rgba(46, 236, 192, 0.16); }
    .btn-sm-fill {
      background: linear-gradient(180deg, #3ef0cc, #18c9a5);
      color: #042318; font-weight: 800; text-transform: uppercase;
      border: 1px solid rgba(46, 236, 192, 0.3);
      box-shadow: 0 4px 14px rgba(46, 236, 192, 0.25);
    }
    .btn-sm-fill:hover { transform: translateY(-1px); color: #031912; }
    .ham { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
    .ham i { display: block; width: 20px; height: 2px; background: var(--mint); margin: 4px 0; border-radius: 2px; }
    .menu-drop { display: none; padding: 6px 0 12px; border-top: 1px solid var(--line); }
    .menu-drop.open { display: flex; flex-direction: column; }
    .menu-drop a { padding: 11px 16px; color: var(--ink-2); border-bottom: 1px solid var(--line); font-weight: 500; }

    .btn-dl {
      display: inline-flex; align-items: center; justify-content: center; gap: 6px;
      background: linear-gradient(135deg, var(--ember), #ff9359);
      color: #fff; font-weight: 700; font-size: 0.88rem;
      padding: 13px 24px; border-radius: 11px;
      box-shadow: 0 0 20px rgba(255, 122, 77, 0.32);
      text-transform: uppercase; letter-spacing: 0.04em; transition: 0.18s;
    }
    .btn-dl:hover { color: #fff; transform: translateY(-1px); }
    .btn-dl-lg { padding: 15px 32px; font-size: 0.95rem; border-radius: 12px; width: 100%; }

    /* —— Intro strip (inner page, not home hero) —— */
    .intro {
      padding: 36px 0 28px;
      border-bottom: 1px solid var(--line);
    }
    .crumb {
      font-size: 0.78rem; color: var(--ink-3); margin-bottom: 18px;
      display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    }
    .crumb span { opacity: 0.45; }
    .intro-grid {
      display: grid; grid-template-columns: 72px 1fr; gap: 20px; align-items: start;
    }
    .intro-icon {
      width: 72px; height: 72px; border-radius: 18px;
      border: 1px solid rgba(46, 236, 192, 0.35);
      background: var(--surface); padding: 6px;
      box-shadow: var(--mint-glow);
    }
    .intro-icon img { width: 100%; height: 100%; object-fit: contain; border-radius: 12px; }
    .intro-body h1 {
      font-size: clamp(1.45rem, 3.8vw, 2.1rem);
      font-weight: 800; line-height: 1.22; margin-bottom: 10px;
    }
    .intro-body p { color: var(--ink-2); font-size: 1rem; line-height: 1.72; max-width: 680px; margin-bottom: 22px; }
    .intro-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 20px; }
    .intro-actions .btn-dl { width: auto; }
    .intro-link { font-size: 0.86rem; font-weight: 600; color: var(--ink-3); }
    .intro-link:hover { color: var(--mint); }
    .spec-strip {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
      max-width: 640px;
    }
    .spec-cell {
      padding: 12px 10px; text-align: center;
      background: var(--surface); border: 1px solid var(--line);
      border-radius: 11px; transition: 0.18s;
    }
    .spec-cell:hover { border-color: rgba(46, 236, 192, 0.4); }
    .spec-cell strong { display: block; font-size: 0.98rem; font-weight: 800; color: var(--mint); margin-bottom: 3px; }
    .spec-cell span { font-size: 0.72rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.04em; font-weight: 600; }

    /* —— Timeline —— */
    .work {
      padding: 40px 0 56px;
    }
    .timeline-wrap { max-width: 760px; margin: 0 auto; }

    /* Timeline steps — instal3 */
    .timeline-head { margin-bottom: 28px; }
    .timeline-head .eyebrow {
      font-size: 0.74rem; font-weight: 800; letter-spacing: 0.09em;
      text-transform: uppercase; color: var(--ember); margin-bottom: 6px;
    }
    .timeline-head h2 { font-size: 1.35rem; font-weight: 800; margin-bottom: 6px; }
    .timeline-head p { font-size: 0.92rem; color: var(--ink-2); }
    .timeline {
      position: relative; padding-left: 8px;
    }
    .timeline::before {
      content: ""; position: absolute; left: 27px; top: 8px; bottom: 8px;
      width: 2px; background: linear-gradient(180deg, var(--mint), rgba(46,236,192,0.15));
      border-radius: 2px;
    }
    .step-item {
      position: relative; display: flex; gap: 18px;
      padding: 0 0 22px 0; align-items: flex-start;
    }
    .step-item:last-child { padding-bottom: 0; }
    .step-num {
      flex-shrink: 0; width: 38px; height: 38px;
      display: flex; align-items: center; justify-content: center;
      background: var(--bg); border: 2px solid var(--mint);
      border-radius: 50%; font-size: 0.88rem; font-weight: 800;
      color: var(--mint); z-index: 1;
      box-shadow: 0 0 0 4px var(--bg), var(--mint-glow);
    }
    .step-content {
      flex: 1; background: var(--surface);
      border: 1px solid var(--line); border-radius: 12px;
      padding: 16px 18px; transition: 0.2s;
    }
    .step-item:hover .step-content { border-color: rgba(46, 236, 192, 0.45); }
    .step-content h3 { font-size: 0.96rem; font-weight: 700; margin-bottom: 6px; color: var(--ink); }
    .step-content p { font-size: 0.9rem; color: var(--ink-2); line-height: 1.68; }

    /* After — instal4 */
    .post {
      padding: 52px 0;
      background: rgba(0, 0, 0, 0.2);
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }
    .post-top { text-align: center; max-width: 520px; margin: 0 auto 32px; }
    .post-top .eyebrow { font-size: 0.74rem; font-weight: 800; letter-spacing: 0.09em; text-transform: uppercase; color: var(--mint); margin-bottom: 8px; }
    .post-top h2 { font-size: 1.4rem; font-weight: 800; margin-bottom: 8px; }
    .post-top p { font-size: 0.94rem; color: var(--ink-2); }
    .post-cards {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
    }
    .after-card {
      background: var(--surface); border: 1px solid var(--line);
      border-radius: 14px; padding: 22px 20px;
      position: relative; overflow: hidden; transition: 0.2s;
    }
    .after-card::before {
      content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--ember), var(--mint));
      opacity: 0.7;
    }
    .after-card:hover { border-color: rgba(46, 236, 192, 0.4); transform: translateY(-2px); }
    .after-card h3 { font-size: 0.94rem; font-weight: 700; color: var(--mint); margin-bottom: 8px; }
    .after-card p { font-size: 0.875rem; color: var(--ink-2); line-height: 1.65; }

    /* Compare — instal5/6 */
    .compare { padding: 52px 0; }
    .compare-top { text-align: center; margin-bottom: 28px; }
    .compare-top h2 { font-size: 1.35rem; font-weight: 800; margin-bottom: 6px; }
    .compare-top p { font-size: 0.92rem; color: var(--ink-2); }
    .compare-box {
      display: grid; grid-template-columns: 1fr auto 1fr;
      gap: 0; align-items: stretch;
      border: 1px solid var(--line); border-radius: 16px;
      overflow: hidden; background: var(--surface);
    }
    .compare-side { padding: 26px 24px; }
    .compare-side h3 { font-size: 1rem; font-weight: 800; margin-bottom: 4px; }
    .compare-side .meta { font-size: 0.8rem; font-weight: 700; color: var(--gold); margin-bottom: 16px; }
    .compare-side ul { padding-left: 18px; color: var(--ink-2); font-size: 0.88rem; }
    .compare-side li { margin-bottom: 8px; line-height: 1.6; }
    .compare-side li::marker { color: var(--mint); }
    .compare-side.arm { border-right: 1px solid var(--line); background: rgba(255,122,77,0.04); }
    .compare-side.uni { background: rgba(46,236,192,0.04); }
    .compare-vs {
      display: flex; align-items: center; justify-content: center;
      padding: 0 14px; font-size: 0.72rem; font-weight: 800;
      letter-spacing: 0.08em; color: var(--ink-3);
      background: var(--bg); border-left: 1px solid var(--line);
      border-right: 1px solid var(--line); writing-mode: vertical-rl;
      text-orientation: mixed; transform: rotate(180deg);
    }

    /* Voices — instal7~9 */
    .voices {
      padding: 52px 0 64px;
      background: rgba(0, 0, 0, 0.18);
      border-top: 1px solid var(--line);
    }
    .voices-top { text-align: center; margin-bottom: 28px; }
    .voices-top h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 6px; }
    .voices-top p { font-size: 0.9rem; color: var(--ink-2); }
    .voice-list { display: flex; flex-direction: column; gap: 12px; max-width: 820px; margin: 0 auto; }
    .voice {
      display: flex; gap: 16px; align-items: flex-start;
      background: var(--surface); border: 1px solid var(--line);
      border-radius: 12px; padding: 18px 20px;
    }
    .voice-mark {
      flex-shrink: 0; font-size: 2rem; line-height: 1; font-weight: 800;
      color: var(--ember); opacity: 0.55; font-family: Georgia, serif;
    }
    .voice p { font-size: 0.92rem; color: var(--ink-2); line-height: 1.72; font-style: italic; }
    .voices-more { text-align: center; margin-top: 22px; font-size: 0.88rem; font-weight: 600; }

    /* CTA + footer */
    .end-cta {
      text-align: center; padding: 48px 20px 52px;
      border-top: 1px solid var(--line);
    }
    .end-cta h2 { font-size: 1.35rem; font-weight: 800; margin-bottom: 8px; }
    .end-cta p { color: var(--ink-2); margin-bottom: 20px; font-size: 0.94rem; }
    .end-cta .btn-dl-lg { max-width: 320px; margin-inline: auto; }
    .site-foot {
      padding: 22px 0; border-top: 1px solid var(--line);
      font-size: 0.84rem; color: var(--ink-3);
    }
    .foot-row {
      display: flex; justify-content: space-between; flex-wrap: wrap;
      gap: 12px; align-items: center;
    }
    .foot-nav { display: flex; gap: 18px; }
    .foot-nav a { color: var(--ink-2); font-weight: 500; }
    .float-dl {
      display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
      padding: 11px 16px; background: rgba(10, 14, 23, 0.94);
      backdrop-filter: blur(10px); border-top: 1px solid var(--line);
    }

    @media (max-width: 900px) {
      .menu, .desk-only { display: none; }
      .ham { display: block; }
      .float-dl { display: block; }
      body { padding-bottom: 68px; }
      .spec-strip { grid-template-columns: repeat(2, 1fr); max-width: 100%; }
      .post-cards { grid-template-columns: 1fr; }
      .compare-box { grid-template-columns: 1fr; }
      .compare-vs {
        writing-mode: horizontal-tb; transform: none;
        padding: 10px; border-left: none; border-right: none;
        border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
      }
      .compare-side.arm { border-right: none; border-bottom: none; }
    }
    @media (max-width: 560px) {
      .intro-grid { grid-template-columns: 1fr; text-align: center; }
      .intro-icon { margin: 0 auto; }
      .intro-body p { margin: 0 auto; }
      .timeline::before { left: 18px; }
      .step-num { width: 34px; height: 34px; font-size: 0.82rem; }
    }