:root {
      --bg: #f2f5f1;
      --surface: #ffffff;
      --surface-2: #e7ece5;
      --ink: #0f1a14;
      --ink-2: #3c4a42;
      --ink-3: #6b7a71;
      --line: #d4ddd4;
      --gold: #c98f0e;
      --gold-soft: #f6e6bd;
      --pitch: #0f3d28;
      --pitch-ink: #eaf4ee;
      --up: #17844a;
      --down: #c23b33;
      --shadow: 0 24px 60px -28px rgba(15, 40, 26, .35);
    }
    @media (prefers-color-scheme: dark) {
      :root:not([data-theme="light"]) {
        --bg: #0c1511;
        --surface: #121e18;
        --surface-2: #18261f;
        --ink: #e8efe9;
        --ink-2: #b6c4bb;
        --ink-3: #82938a;
        --line: #24352c;
        --gold: #f0b93a;
        --gold-soft: #3a2f14;
        --pitch: #0a2a1c;
        --pitch-ink: #eaf4ee;
        --up: #3ecf7f;
        --down: #f06a60;
        --shadow: 0 24px 60px -28px rgba(0, 0, 0, .7);
      }
    }
    :root[data-theme="dark"] {
      --bg: #0c1511;
      --surface: #121e18;
      --surface-2: #18261f;
      --ink: #e8efe9;
      --ink-2: #b6c4bb;
      --ink-3: #82938a;
      --line: #24352c;
      --gold: #f0b93a;
      --gold-soft: #3a2f14;
      --pitch: #0a2a1c;
      --pitch-ink: #eaf4ee;
      --up: #3ecf7f;
      --down: #f06a60;
      --shadow: 0 24px 60px -28px rgba(0, 0, 0, .7);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { animation: none !important; transition: none !important; } }
    body {
      margin: 0;
      background: var(--bg);
      color: var(--ink);
      font: 400 17px/1.6 "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; }
    :focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; border-radius: 6px; }

    .wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
    .display {
      font-family: "Big Shoulders Display", "Arial Narrow", Impact, sans-serif;
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: .01em;
      line-height: .92;
      text-wrap: balance;
      margin: 0;
    }
    /* Tiếng Việt có dấu chồng (Ẫ, Ủ): dòng 0.92 làm dấu chạm dòng trên. */
    :lang(vi) .display { line-height: 1.08; }
    :lang(vi) .feature h3, :lang(vi) .plan h3 { line-height: 1.1; }
    .eyebrow {
      font: 700 12px/1 "JetBrains Mono", ui-monospace, monospace;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--gold);
      margin: 0 0 14px;
    }
    .mono { font-family: "JetBrains Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }

    /* ---------- header ---------- */
    header.top {
      position: sticky; top: 0; z-index: 20;
      background: color-mix(in srgb, var(--bg) 88%, transparent);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--line);
    }
    header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
    .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
    .brand img { width: 32px; height: 32px; border-radius: 8px; }
    .brand b { font: 900 26px/1 "Big Shoulders Display", sans-serif; letter-spacing: .02em; }
    nav.links { display: flex; align-items: center; gap: 22px; font-size: 15px; font-weight: 600; }
    nav.links a { text-decoration: none; color: var(--ink-2); }
    nav.links a:hover { color: var(--ink); }
    .btn-mini {
      background: var(--ink); color: var(--bg) !important; padding: 8px 14px; border-radius: 999px;
    }
    @media (max-width: 760px) { nav.links a:not(.btn-mini) { display: none; } }

    /* ---------- hero ---------- */
    .hero { padding: 48px 0 40px; overflow: hidden; }
    .hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
    .hero h1 { font-size: clamp(54px, 7vw, 92px); }
    .hero h1 em { font-style: normal; color: var(--gold); }
    .hero .lede { font-size: 20px; color: var(--ink-2); max-width: 34ch; margin: 22px 0 30px; }
    .stores { display: flex; flex-wrap: wrap; gap: 12px; }
    .store {
      display: inline-flex; align-items: center; gap: 12px;
      padding: 11px 18px 11px 14px; border-radius: 14px;
      background: var(--ink); color: var(--bg); text-decoration: none;
      transition: transform .15s ease, box-shadow .15s ease;
      min-width: 190px;
    }
    .store:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
    .store svg { width: 26px; height: 26px; flex: none; }
    .store span { display: flex; flex-direction: column; line-height: 1.15; }
    .store small { font-size: 11px; opacity: .75; letter-spacing: .02em; }
    .store strong { font-size: 17px; font-weight: 700; }
    .proof { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 26px; color: var(--ink-3); font-size: 14px; }
    .proof b { color: var(--ink); }
    .stars { color: var(--gold); letter-spacing: 2px; }

    .phones { position: relative; height: 580px; }
    .phones img {
      position: absolute; width: 270px; border-radius: 34px;
      box-shadow: var(--shadow);
    }
    .phones .p1 { right: 170px; top: 40px; transform: rotate(-5deg); }
    .phones .p2 { right: 0; top: 0; transform: rotate(4deg); }
    .chip {
      position: absolute; z-index: 2; background: var(--surface); border: 1px solid var(--line);
      border-radius: 14px; padding: 10px 14px; box-shadow: var(--shadow); font-size: 13px;
    }
    .chip b { display: block; font: 700 18px/1.2 "JetBrains Mono", monospace; }
    .chip.c1 { left: 0; bottom: 70px; }
    .chip.c1 b { color: var(--up); }
    .chip.c2 { right: 20px; bottom: 10px; }

    @media (max-width: 900px) {
      .hero .wrap { grid-template-columns: 1fr; }
      /* Điện thoại: một máy ở giữa, hai chip hai bên — hai máy chồng nhau quá chật. */
      .phones { height: auto; display: flex; justify-content: center; padding: 8px 0 12px; }
      .phones .p1 { display: none; }
      .phones .p2 { position: relative; right: auto; top: auto; width: min(250px, 62vw); transform: rotate(2deg); }
      .chip.c1 { left: 0; bottom: 60px; }
      .chip.c2 { right: 0; bottom: 16px; }
    }

    /* ---------- ticker ---------- */
    .ticker {
      background: var(--pitch); color: var(--pitch-ink);
      border-block: 1px solid color-mix(in srgb, var(--pitch-ink) 12%, transparent);
      overflow: hidden; position: relative;
    }
    .ticker .label {
      position: absolute; left: 0; top: 0; bottom: 0; z-index: 2; display: flex; align-items: center;
      padding: 0 16px; background: var(--gold); color: #1b1405;
      font: 700 11px/1 "JetBrains Mono", monospace; letter-spacing: .12em; text-transform: uppercase;
    }
    .track { display: flex; gap: 40px; width: max-content; padding: 14px 0 14px 190px; animation: run 48s linear infinite; }
    .track span { font: 500 14px/1 "JetBrains Mono", monospace; white-space: nowrap; }
    .track i { font-style: normal; margin-left: 6px; }
    .track .u { color: #4be08d; }
    .track .d { color: #ff867d; }
    @keyframes run { to { transform: translateX(-50%); } }

    /* ---------- sections ---------- */
    section.block { padding: 96px 0; }
    .head { max-width: 720px; margin-bottom: 48px; }
    .head h2 { font-size: clamp(40px, 6vw, 68px); }
    .head p { color: var(--ink-2); font-size: 19px; margin: 18px 0 0; max-width: 58ch; }

    .feature {
      display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
      padding: 40px 0; border-top: 1px solid var(--line);
    }
    .feature:nth-of-type(even) .shot { order: -1; }
    .feature h3 { font: 900 40px/1 "Big Shoulders Display", sans-serif; text-transform: uppercase; margin: 0 0 14px; }
    .feature p { color: var(--ink-2); margin: 0 0 16px; max-width: 52ch; }
    .feature ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
    .feature li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; color: var(--ink-2); }
    .feature li::before { content: ""; width: 10px; height: 10px; margin-top: 8px; border-radius: 2px; background: var(--gold); transform: rotate(45deg); }
    .shot { display: flex; justify-content: center; background: var(--surface-2); border-radius: 28px; padding: 36px 20px 0; overflow: hidden; }
    .shot img { width: min(300px, 80%); border-radius: 30px 30px 0 0; box-shadow: var(--shadow); }
    @media (max-width: 860px) {
      .feature { grid-template-columns: 1fr; gap: 28px; }
      .feature:nth-of-type(even) .shot { order: 0; }
    }

    .grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    @media (max-width: 860px) { .grid3 { grid-template-columns: 1fr; } }
    .tile { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 26px; }
    .tile h4 { margin: 12px 0 8px; font-size: 19px; }
    .tile p { margin: 0; color: var(--ink-2); font-size: 16px; }
    .tile .ic { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--gold-soft); color: var(--gold); }
    .tile .ic svg { width: 22px; height: 22px; }

    /* extension band */
    .band { background: var(--pitch); color: var(--pitch-ink); border-radius: 32px; padding: 56px; display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; }
    .band h2 { font-size: clamp(40px, 5.4vw, 64px); }
    .band p { color: color-mix(in srgb, var(--pitch-ink) 78%, transparent); max-width: 52ch; }
    .band .store { background: var(--pitch-ink); color: var(--pitch); }
    .steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; counter-reset: s; }
    .steps li { counter-increment: s; display: grid; grid-template-columns: 44px 1fr; gap: 14px; align-items: start; background: color-mix(in srgb, var(--pitch-ink) 7%, transparent); border-radius: 16px; padding: 16px; }
    .steps li::before { content: counter(s); font: 900 30px/1 "Big Shoulders Display", sans-serif; color: var(--gold); }
    .steps b { display: block; }
    .steps span { font-size: 15px; color: color-mix(in srgb, var(--pitch-ink) 72%, transparent); }
    @media (max-width: 860px) { .band { grid-template-columns: 1fr; padding: 32px 22px; } }

    /* plans */
    .plans { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    @media (max-width: 760px) { .plans { grid-template-columns: 1fr; } }
    .plan { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 30px; }
    .plan.pro { border: 2px solid var(--gold); }
    .plan h3 { font: 900 34px/1 "Big Shoulders Display", sans-serif; text-transform: uppercase; margin: 0 0 6px; }
    .plan .sub { color: var(--ink-3); margin: 0 0 18px; font-size: 15px; }
    .plan ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
    .plan li { padding-left: 26px; position: relative; color: var(--ink-2); }
    .plan li::before { content: "✓"; position: absolute; left: 0; color: var(--up); font-weight: 700; }

    /* faq */
    .faq { display: grid; gap: 10px; max-width: 820px; }
    details { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px 22px; }
    summary { cursor: pointer; font-weight: 700; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
    summary::after { content: "+"; font: 700 22px/1 "JetBrains Mono", monospace; color: var(--gold); }
    details[open] summary::after { content: "–"; }
    details p { color: var(--ink-2); margin: 12px 0 0; }

    /* cta + footer */
    .cta { text-align: center; padding: 100px 0 90px; }
    .cta h2 { font-size: clamp(48px, 8vw, 96px); }
    .cta .stores { justify-content: center; margin-top: 32px; }
    footer { border-top: 1px solid var(--line); padding: 36px 0 48px; color: var(--ink-3); font-size: 14px; }
    footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; }
    footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
    footer a { text-decoration: none; color: var(--ink-2); font-weight: 600; }
    footer a:hover { color: var(--ink); }
    .fine { max-width: 70ch; }

    .lang { font: 700 12px/1 "JetBrains Mono", monospace; letter-spacing: .08em; border: 1px solid var(--line); border-radius: 999px; padding: 9px 11px; text-decoration: none; color: var(--ink-2) !important; }
    .lang:hover { color: var(--ink) !important; border-color: var(--ink-3); }
    @media (max-width: 760px) { nav.links a.lang { display: inline-block; } }
    .theme-toggle { background: none; border: 1px solid var(--line); color: var(--ink-2); border-radius: 999px; width: 36px; height: 36px; cursor: pointer; display: grid; place-items: center; }
    .theme-toggle svg { width: 18px; height: 18px; }