@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-400.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-400.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/tai-khoan/font/bvp-latin-400.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-500.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-500.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/tai-khoan/font/bvp-latin-500.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-600.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-600.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/tai-khoan/font/bvp-latin-600.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:700;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-700.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:700;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-700.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:700;font-display:swap;src:url(/tai-khoan/font/bvp-latin-700.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:800;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-800.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:800;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-800.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:800;font-display:swap;src:url(/tai-khoan/font/bvp-latin-800.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:900;font-display:swap;src:url(/tai-khoan/font/bvp-vietnamese-900.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:900;font-display:swap;src:url(/tai-khoan/font/bvp-latin-ext-900.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:900;font-display:swap;src:url(/tai-khoan/font/bvp-latin-900.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
  :root {
    --bg: #FAF6F0;
    --bg-warm: #F3EDE3;
    --surface: #FFFFFF;
    --obsidian: #0E1015;
    --obsidian-2: #171A22;
    --obsidian-3: #222733;
    --ink: #161312;
    --ink-2: #524A47;
    --ink-3: #857B77;
    --line: rgba(22, 19, 18, 0.09);
    --line-strong: rgba(22, 19, 18, 0.16);
    --line-dark: rgba(255, 255, 255, 0.11);

    /* Màu thương hiệu lấy từ logo chính thức */
    --red: #C8372D;
    --red-bright: #E03E33;
    --red-deep: #9E1F16;
    --red-soft: #FDECEB;
    --amber: #F5B800;
    --amber-soft: #FFF6D6;
    --amber-ink: #593B00;
    --send: #FF7A1A;
    --ok: #18864B;
    --ok-soft: #E1F8EB;

    /* Màu huy hiệu ngôn ngữ */
    --zh: #F5B800;
    --zh-ink: #9E1B13;
    --ja: #E2558F;
    --ko: #14A38B;
    --en: #2F6FDB;

    /* Bo góc bong bóng chat theo logo */
    --bub-xl: 36px 36px 36px 10px;
    --bub-lg: 28px 28px 28px 8px;
    --bub-md: 20px 20px 20px 6px;
    --bub-sm: 14px 14px 14px 4px;

    --ff: "Be Vietnam Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --ff-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    --ff-cjk: "Be Vietnam Pro", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", sans-serif;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
  body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--ff);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
  }
  /* Quy chuẩn ngắt dòng tiếng Việt: không dùng balance tự động gây cắt đôi cụm từ như "ai / cũng" */
  h1, h2, h3, h4 {
    overflow-wrap: break-word;
  }
  p, li {
    text-wrap: pretty;
  }
  .nb {
    white-space: nowrap;
  }
  a { color: inherit; text-decoration: none; }
  button, input { font: inherit; color: inherit; }
  .skip { position: absolute; left: -999px; }
  .skip:focus { left: 16px; top: 16px; z-index: 999; background: #fff; padding: 8px 12px; border-radius: 8px; }
  ul, ol { list-style: none; }

  .wrap {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 clamp(18px, 4vw, 48px);
  }

  /* =========================================================
     THANH ĐIỀU HƯỚNG CHÍNH (NỀN KÍNH SÁNG TIN CẬY & CHUYÊN NGHIỆP)
     ========================================================= */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 150;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(22, 19, 18, 0.09);
    padding: 13px 0;
    color: var(--ink);
    box-shadow: 0 4px 20px -6px rgba(22, 19, 18, 0.05);
  }
  .nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: nowrap;
  }
  .brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    font-weight: 900;
    font-size: 23px;
    letter-spacing: -0.035em;
    color: var(--ink);
    flex-shrink: 0;
    white-space: nowrap;
  }
  .brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: block;
    box-shadow: 0 4px 12px rgba(200, 55, 45, 0.28);
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: clamp(16px, 1.8vw, 26px);
    font-size: 14.5px;
    font-weight: 700;
    color: var(--ink-2);
    flex-wrap: nowrap;
    white-space: nowrap;
  }
  .nav-links a {
    white-space: nowrap;
    display: inline-block;
    padding: 4px 0;
    transition: color 0.15s;
  }
  .nav-links a:hover { color: var(--red); }
  .nav-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    white-space: nowrap;
  }
  /* Bộ chọn ngôn ngữ dạng danh sách thả xuống (Dropdown List) nền sáng */
  .lang-dropdown {
    position: relative;
  }
  .lang-trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #F8F6F2;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    padding: 8px 11px;
    color: var(--ink);
    font-size: 12.5px;
    font-weight: 800;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s;
  }
  .lang-trigger:hover {
    background: #FFFFFF;
    border-color: var(--red);
  }
  .lang-trigger-caret {
    font-size: 10px;
    color: var(--ink-3);
    transition: transform 0.18s;
  }
  .lang-dropdown.open .lang-trigger-caret {
    transform: rotate(180deg);
    color: var(--red);
  }
  .lang-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 190px;
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-radius: 14px;
    padding: 6px;
    box-shadow: 0 20px 44px -8px rgba(22, 19, 18, 0.16);
    z-index: 250;
    flex-direction: column;
    gap: 2px;
  }
  .lang-dropdown.open .lang-menu {
    display: flex;
    animation: popIn 0.16s var(--ease);
  }
  .lang-item {
    border: 0;
    background: transparent;
    color: var(--ink-2);
    font-size: 13px;
    font-weight: 700;
    padding: 8px 11px;
    border-radius: 9px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    text-align: left;
    white-space: nowrap;
    transition: all 0.14s;
  }
  .lang-item:hover {
    background: var(--bg);
    color: var(--ink);
  }
  .lang-item.active {
    background: var(--red-soft);
    color: var(--red);
  }
  .lang-badge-mini {
    font-size: 10.5px;
    font-weight: 900;
    padding: 1px 6px;
    border-radius: 5px;
    background: var(--bg-warm);
    color: var(--ink-2);
  }
  .lang-item.active .lang-badge-mini {
    background: var(--red);
    color: #fff;
  }
  .mobile-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid var(--line-strong);
    background: var(--bg);
    color: var(--ink);
    font-size: 18px;
    cursor: pointer;
  }
  .mobile-drawer {
    display: none;
    background: #FFFFFF;
    border-top: 1px solid var(--line);
    padding: 16px 0 20px;
    margin-top: 13px;
  }
  .mobile-drawer.open {
    display: block;
    animation: popIn 0.2s var(--ease);
  }
  .mobile-nav-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, minmax(0, 1fr)));
    gap: 8px;
  }
  .mobile-nav-list a {
    background: var(--bg);
    border: 1px solid var(--line);
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    color: var(--ink);
  }

  /* Nút bấm */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 12px 24px;
    border-radius: var(--bub-sm);
    font-weight: 800;
    font-size: 15px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), background-color 0.18s;
    white-space: nowrap;
  }
  .btn:active { transform: translateY(1px) scale(0.98); }
  /* Nền tảng chưa phát hành: nút "Sắp có" xám, không bấm được */
  .btn.is-soon { background: #ECE7DE; color: var(--ink-3); border-color: transparent; box-shadow: none; cursor: default; pointer-events: none; }
  .btn-pri {
    background: linear-gradient(180deg, var(--red-bright) 0%, var(--red) 100%);
    color: #fff;
    box-shadow: 0 10px 24px -4px rgba(200, 55, 45, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.28);
  }
  .btn-pri:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px -4px rgba(200, 55, 45, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  }
  .btn-amber {
    background: linear-gradient(180deg, #FFCA28 0%, var(--amber) 100%);
    color: #1F1400;
    box-shadow: 0 10px 24px -4px rgba(245, 184, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  }
  .btn-amber:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px -4px rgba(245, 184, 0, 0.5);
  }
  .btn-dark-ghost {
    background: #FFFFFF;
    color: var(--ink);
    border-color: var(--line-strong);
    box-shadow: 0 2px 8px rgba(22, 19, 18, 0.05);
  }
  .btn-dark-ghost:hover {
    background: var(--bg-warm);
    border-color: var(--red);
    color: var(--red);
  }
  .btn-light-ghost {
    background: var(--surface);
    color: var(--ink);
    border-color: var(--line-strong);
  }
  .btn-light-ghost:hover {
    background: var(--bg-warm);
  }
  .btn-lg {
    padding: 16px 32px;
    font-size: 16.5px;
    border-radius: 18px 18px 18px 5px;
  }
  .btn-sm {
    padding: 9px 18px;
    font-size: 13.5px;
  }

  /* Phím cơ 3D sáng rõ */
  kbd.key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-family: var(--ff-mono);
    font-size: 0.86em;
    font-weight: 800;
    padding: 3px 9px;
    border-radius: 7px;
    background: linear-gradient(180deg, #FFFFFF 0%, #EFECE6 100%);
    color: var(--ink);
    border: 1px solid #C7C1B8;
    border-bottom-width: 3px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    line-height: 1.2;
    user-select: none;
  }
  kbd.key-dark {
    background: linear-gradient(180deg, #FFFFFF 0%, #F1EDE4 100%);
    color: var(--ink);
    border-color: #C7C1B8;
    border-bottom-color: #A8A196;
  }

  /* =========================================================
     PHẦN 1: SÂN KHẤU ĐẦU TRANG NỀN SÁNG TIN CẬY & CHUYÊN NGHIỆP
     ========================================================= */
  .hero-stage {
    background: linear-gradient(180deg, #FFFFFF 0%, #FAF6F0 65%, #F3EDE3 100%);
    color: var(--ink);
    padding: clamp(36px, 5vw, 60px) 0 clamp(68px, 7vw, 96px);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
  }
  /* Ánh sáng ấm nhẹ nhàng phía sau sân khấu nền sáng */
  .hero-glow-red {
    position: absolute;
    top: -180px;
    left: -120px;
    width: 680px;
    height: 680px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(200, 55, 45, 0.08) 0%, transparent 68%);
    pointer-events: none;
  }
  .hero-glow-amber {
    position: absolute;
    bottom: -220px;
    right: -100px;
    width: 760px;
    height: 760px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(245, 184, 0, 0.14) 0%, rgba(200, 55, 45, 0.06) 42%, transparent 70%);
    pointer-events: none;
  }
  .hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 0.98fr) minmax(0, 1.22fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: center;
  }

  .eyebrow-dark {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 15px 6px 10px;
    border-radius: 999px;
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    box-shadow: 0 2px 8px rgba(22, 19, 18, 0.04);
    font-size: 13px;
    font-weight: 600;
    color: var(--ink-2);
    margin-bottom: 22px;
  }
  .eyebrow-dark .pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ok);
    box-shadow: 0 0 0 4px rgba(24, 134, 75, 0.18);
  }
  .eyebrow-dark strong { color: var(--red); }

  .hero-stage h1 {
    font-size: clamp(2.2rem, 1.4rem + 2.4vw, 3.4rem);
    font-weight: 900;
    letter-spacing: -0.035em;
    line-height: 1.08;
    color: var(--ink);
    text-wrap: balance;
  }
  .hero-stage h1 .hl-grad {
    background: linear-gradient(95deg, var(--red) 0%, #D97706 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
  }
  .hero-lead-dark {
    margin-top: 20px;
    font-size: clamp(1.04rem, 0.98rem + 0.25vw, 1.18rem);
    color: var(--ink-2);
    max-width: 50ch;
    line-height: 1.62;
  }
  .hero-lead-dark strong {
    color: var(--ink);
    font-weight: 800;
  }

  /* Thanh biến hình trực tiếp ở cột trái (Nền trắng sáng tinh tế) */
  .instant-morph {
    margin-top: 22px;
    background: #FFFFFF;
    border: 1.5px solid rgba(200, 55, 45, 0.2);
    border-radius: 18px;
    padding: 14px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: 0 12px 30px -8px rgba(22, 19, 18, 0.07);
  }
  .im-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .im-box {
    font-size: 14px;
    line-height: 1.4;
    min-width: 0;
  }
  .im-box small {
    display: block;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ink-3);
    margin-bottom: 2px;
  }
  .im-vi { color: var(--ink); font-weight: 700; }
  .im-tr { color: var(--red-deep); font-weight: 800; font-family: var(--ff-cjk); }
  .im-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 11.5px;
    color: var(--red);
    font-weight: 800;
  }
  .im-divider::before, .im-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--line-strong);
  }

  .hero-cta {
    margin-top: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
  }
  .os-sub-dark {
    margin-top: 16px;
    font-size: 13.5px;
    color: var(--ink-2);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
  }
  .os-sub-dark button, .os-sub-dark a {
    border: 0;
    background: none;
    color: var(--red);
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
  }
  .os-sub-dark button:hover, .os-sub-dark a:hover { color: var(--red-deep); }

  .trust-pills-dark {
    margin-top: 28px;
    padding-top: 22px;
    border-top: 1px solid var(--line-strong);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 18px;
  }
  .trust-item-dark {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--ink);
  }
  .trust-dot-amber {
    width: 11px;
    height: 9px;
    border-radius: 4px 4px 4px 1px;
    background: var(--ok);
    flex: none;
  }

  /* =========================================================
     SÂN KHẤU CHAT THỬ TRỰC TIẾP (KHUNG SÁNG TIN CẬY & RÕ NÉT)
     ========================================================= */
  .stage-wrap {
    position: relative;
  }
  /* Bong bóng vàng lớn phía sau lấy cảm hứng từ logo BeeKey */
  .stage-back-bubble {
    position: absolute;
    top: -14px;
    right: -14px;
    width: 62%;
    height: 58%;
    background: linear-gradient(135deg, #FFE066 0%, var(--amber) 100%);
    border-radius: 36px 36px 10px 36px;
    z-index: 0;
    box-shadow: 0 20px 50px rgba(245, 184, 0, 0.25);
  }
  .stage-card {
    position: relative;
    z-index: 1;
    background: #FFFFFF;
    border: 1.5px solid rgba(22, 19, 18, 0.14);
    border-radius: var(--bub-xl);
    padding: 18px;
    box-shadow: 0 32px 72px -16px rgba(22, 19, 18, 0.14), 0 4px 16px rgba(22, 19, 18, 0.04);
  }
  .stage-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
  }
  .stage-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 800;
    color: var(--red-deep);
    background: var(--red-soft);
    border: 1px solid rgba(200, 55, 45, 0.22);
    padding: 5px 12px;
    border-radius: 99px;
  }
  .auto-btn {
    border: 1px solid var(--line-strong);
    background: var(--bg);
    color: var(--ink-2);
    font-size: 12px;
    font-weight: 700;
    padding: 5px 11px;
    border-radius: 99px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
  }
  .auto-btn:hover {
    background: var(--bg-warm);
    color: var(--ink);
  }
  .auto-btn.playing {
    background: var(--ok-soft);
    border-color: rgba(24, 134, 75, 0.35);
    color: var(--ok);
  }

  /* 4 tab đối tác nền sáng */
  .partner-tabs {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    background: #F4F1EA;
    padding: 5px;
    border-radius: 14px;
    margin-bottom: 10px;
    border: 1px solid var(--line);
  }
  .ptab {
    border: 1px solid transparent;
    background: transparent;
    padding: 8px 8px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    text-align: left;
    color: var(--ink-2);
    transition: all 0.18s var(--ease);
  }
  .ptab:hover { background: rgba(255, 255, 255, 0.65); color: var(--ink); }
  .ptab.active {
    background: #FFFFFF;
    color: var(--ink);
    border-color: var(--line-strong);
    box-shadow: 0 3px 10px rgba(22, 19, 18, 0.08);
  }
  .p-chip {
    width: 28px;
    height: 28px;
    border-radius: 8px 8px 8px 2px;
    display: grid;
    place-items: center;
    font-weight: 900;
    font-size: 14px;
    color: #fff;
    flex: none;
  }
  .ptab-info { min-width: 0; }
  .ptab-info b {
    display: block;
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .ptab-info span {
    display: block;
    font-size: 10.5px;
    opacity: 0.8;
  }

  /* Thanh chọn giọng văn trong sân khấu nền sáng */
  .sb-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
    padding: 7px 12px;
    background: #F8F6F2;
    border-radius: 12px;
    border: 1px solid var(--line);
    font-size: 12px;
    flex-wrap: wrap;
  }
  .ctrl-group {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .ctrl-label {
    color: var(--ink-2);
    font-weight: 700;
  }
  .pill-btn {
    border: 1px solid transparent;
    background: transparent;
    padding: 3px 10px;
    border-radius: 7px;
    font-weight: 700;
    color: var(--ink-2);
    cursor: pointer;
    font-size: 12px;
  }
  .pill-btn:hover { background: #EAE5DC; color: var(--ink); }
  .pill-btn.active {
    background: var(--red);
    color: #fff;
  }

  /* Cửa sổ ứng dụng chat bên trong sân khấu */
  .chat-win {
    background: #F5F3EE;
    color: var(--ink);
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    box-shadow: inset 0 1px 0 #fff;
  }
  .chat-top {
    background: #FFFFFF;
    padding: 10px 14px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .dots { display: flex; gap: 6px; }
  .dots i { width: 10px; height: 10px; border-radius: 50%; display: block; }
  .dots i:nth-child(1) { background: #EC6A5E; }
  .dots i:nth-child(2) { background: #F4BF4F; }
  .dots i:nth-child(3) { background: #61C554; }
  .chat-partner-title {
    font-size: 13px;
    font-weight: 800;
    color: var(--ink);
  }
  .chat-app-tag {
    margin-left: auto;
    font-size: 11.5px;
    font-weight: 800;
    padding: 2px 9px;
    border-radius: 99px;
    background: #E6F7ED;
    color: #137A43;
  }

  .chat-messages {
    padding: 14px 16px;
    min-height: 138px;
    max-height: 210px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-family: var(--ff-cjk);
  }
  .msg-in-wrap {
    align-self: flex-start;
    max-width: 90%;
  }
  .msg-in {
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-radius: 14px 14px 14px 4px;
    padding: 9px 13px;
    font-size: 13.5px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    cursor: pointer;
    transition: border-color 0.15s;
  }
  .msg-in:hover { border-color: var(--red); }
  .msg-read-hint {
    font-size: 11.5px;
    color: var(--ink-2);
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-weight: 600;
  }
  .msg-read-hint:hover { color: var(--red); }
  .msg-read-bubble {
    margin-top: 5px;
    background: #FFFDF7;
    color: var(--ink);
    border: 1px solid rgba(245, 184, 0, 0.55);
    border-left: 3.5px solid var(--amber);
    border-radius: 10px;
    padding: 8px 11px;
    font-size: 12.5px;
    box-shadow: 0 4px 12px rgba(22, 19, 18, 0.05);
    display: none;
    animation: popIn 0.22s var(--ease);
  }
  .msg-read-bubble.show { display: block; }
  .msg-read-bubble span {
    display: inline-block;
    background: var(--red);
    color: #fff;
    font-weight: 800;
    font-size: 10.5px;
    padding: 1px 6px;
    border-radius: 4px;
    margin-right: 6px;
  }

  .msg-out {
    align-self: flex-end;
    max-width: 90%;
    background: #95EC69;
    color: #111;
    border-radius: 14px 14px 4px 14px;
    padding: 9px 13px;
    font-size: 13.5px;
    font-weight: 600;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    animation: popIn 0.25s var(--ease);
  }

  /* Bong bóng Kiểm tra trước khi gửi (HUD Review) - NỀN SÁNG VIỀN VÀNG NỔI BẬT */
  .hud-review {
    margin: 0 12px 10px;
    background: #FFFFFF;
    color: var(--ink);
    border-radius: 16px;
    padding: 13px 14px;
    border: 2px solid var(--amber);
    box-shadow: 0 16px 36px -6px rgba(22, 19, 18, 0.14);
    display: none;
    position: relative;
    animation: popIn 0.26s var(--ease);
  }
  .hud-review.open { display: block; }
  @keyframes popIn {
    from { opacity: 0; transform: translateY(8px) scale(0.98); }
    to { opacity: 1; transform: none; }
  }
  .hud-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 12px;
  }
  .hud-badges {
    display: flex;
    align-items: center;
    gap: 7px;
    flex-wrap: wrap;
  }
  .hud-lang-tag {
    font-weight: 800;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 6px 6px 6px 2px;
    background: var(--zh);
    color: var(--zh-ink);
  }
  .hud-shield-tag {
    font-size: 11px;
    font-weight: 800;
    color: var(--ok);
    background: var(--ok-soft);
    border: 1px solid rgba(24, 134, 75, 0.28);
    padding: 2px 8px;
    border-radius: 99px;
  }
  .hud-close {
    border: 1px solid var(--line);
    background: var(--bg);
    color: var(--ink-2);
    width: 22px;
    height: 22px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
  }
  .hud-translation {
    background: #FFFDF7;
    border: 1px solid rgba(245, 184, 0, 0.45);
    border-left: 3.5px solid var(--amber);
    border-radius: 10px;
    padding: 9px 12px;
    font-size: 14.5px;
    font-family: var(--ff-cjk);
    line-height: 1.5;
    font-weight: 700;
    color: var(--ink);
  }
  .hud-back {
    margin-top: 6px;
    font-size: 12px;
    color: var(--ink-2);
    line-height: 1.45;
  }
  .hud-back strong {
    color: var(--ink);
    font-weight: 800;
  }
  .hud-actions {
    margin-top: 9px;
    padding-top: 9px;
    border-top: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
  }
  .hud-hint {
    font-size: 11.5px;
    color: var(--ink-2);
    font-weight: 600;
  }
  .hud-send-btn {
    border: 0;
    background: var(--send);
    color: #FFFFFF;
    font-weight: 800;
    font-size: 12.5px;
    padding: 6px 14px;
    border-radius: 999px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 0 0 0 rgba(255, 122, 26, 0.5);
    animation: pulseSend 2s infinite;
  }
  @keyframes pulseSend {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 122, 26, 0.55); }
    60% { box-shadow: 0 0 0 8px rgba(255, 122, 26, 0); }
  }

  /* Câu mẫu & ô nhập */
  .preset-bar {
    padding: 7px 12px 0;
    background: #FFFFFF;
    border-top: 1px solid var(--line);
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    font-size: 11.5px;
  }
  .preset-bar span {
    color: var(--ink-3);
    font-weight: 700;
    white-space: nowrap;
  }
  .preset-chip {
    border: 1px solid var(--line-strong);
    background: var(--bg);
    color: var(--ink-2);
    padding: 3px 9px;
    border-radius: 99px;
    cursor: pointer;
    white-space: nowrap;
    font-weight: 600;
    transition: all 0.15s;
  }
  .preset-chip:hover {
    border-color: var(--red);
    color: var(--red);
    background: var(--red-soft);
  }
  .compose-row {
    background: #FFFFFF;
    padding: 9px 12px 11px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .compose-input {
    flex: 1;
    min-width: 0;
    border: 1.5px solid var(--line-strong);
    border-radius: 11px;
    padding: 8px 12px;
    font-size: 13.5px;
    font-weight: 500;
    background: var(--bg);
    color: var(--ink);
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
  }
  .compose-input:focus {
    border-color: var(--red);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(200, 55, 45, 0.14);
  }
  .bk-floating-btn {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 0;
    padding: 0;
    background: transparent;
    cursor: pointer;
    flex: none;
    transition: transform 0.15s;
  }
  .bk-floating-btn img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: block;
    box-shadow: 0 4px 10px rgba(200, 55, 45, 0.35);
  }
  .bk-floating-btn:hover { transform: scale(1.06); }
  .bk-floating-btn i {
    position: absolute;
    right: -6px;
    bottom: -5px;
    font-style: normal;
    font-size: 10px;
    font-weight: 900;
    padding: 1px 6px;
    border-radius: 99px;
    background: var(--zh);
    color: var(--zh-ink);
    border: 1.5px solid #fff;
  }
  .enter-trigger-btn {
    border: 1px solid #C9C4BC;
    border-bottom-width: 3px;
    background: linear-gradient(180deg, #FFFFFF 0%, #EFECE6 100%);
    color: var(--ink);
    font-family: var(--ff-mono);
    font-weight: 800;
    font-size: 12px;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.12s;
  }
  .enter-trigger-btn:hover {
    border-color: var(--red);
    color: var(--red);
  }

  .lock-val {
    display: inline-flex;
    align-items: center;
    background: var(--amber-soft);
    color: var(--amber-ink);
    border: 1px solid rgba(245, 184, 0, 0.65);
    font-weight: 800;
    padding: 0 6px;
    border-radius: 5px;
  }

  /* =========================================================
     PHẦN 2: SO SÁNH ĐỐI ĐẦU (CÁCH CŨ MỆT MỎI vs CÓ BEEKEY)
     ========================================================= */
  .section {
    padding: clamp(64px, 7.5vw, 108px) 0;
  }
  .sec-head {
    max-width: 980px;
    margin-bottom: clamp(32px, 4vw, 48px);
  }
  .sec-tag {
    display: inline-block;
    font-size: 12.5px;
    font-weight: 800;
    color: var(--red);
    background: var(--red-soft);
    padding: 5px 13px;
    border-radius: 8px 8px 8px 2px;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
  }
  .sec-head h2 {
    font-size: clamp(1.85rem, 1.4rem + 1.5vw, 2.55rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.15;
  }
  .sec-head p {
    margin-top: 12px;
    font-size: 17px;
    color: var(--ink-2);
    max-width: 68ch;
  }

  .vs-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 24px;
    align-items: stretch;
  }
  .vs-card {
    border-radius: var(--bub-lg);
    padding: clamp(26px, 3.2vw, 38px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  .vs-old {
    background: #F4F1EA;
    border: 1.5px dashed rgba(22, 19, 18, 0.2);
    color: var(--ink-2);
  }
  .vs-new {
    background: #FFFFFF;
    color: var(--ink);
    border: 2px solid var(--red);
    box-shadow: 0 24px 56px -12px rgba(200, 55, 45, 0.16), 0 4px 16px rgba(22, 19, 18, 0.05);
    position: relative;
  }
  .vs-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 800;
    padding: 5px 12px;
    border-radius: 99px;
    margin-bottom: 16px;
  }
  .vs-old .vs-badge {
    background: rgba(22, 19, 18, 0.08);
    color: var(--ink-2);
  }
  .vs-new .vs-badge {
    background: var(--red);
    color: #fff;
  }
  .vs-card h3 {
    font-size: clamp(1.4rem, 1.2rem + 0.6vw, 1.85rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: 18px;
    color: var(--ink);
  }
  .vs-old h3 { color: var(--ink); }
  .vs-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .vs-step-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: 12px;
    font-size: 14.5px;
    font-weight: 600;
  }
  .vs-old .vs-step-item {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(22, 19, 18, 0.08);
  }
  .vs-new .vs-step-item {
    background: #FAF6F0;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    font-size: 15.5px;
  }
  .vs-num {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 12.5px;
    font-weight: 800;
    flex: none;
  }
  .vs-old .vs-num { background: rgba(22, 19, 18, 0.12); color: var(--ink); }
  .vs-new .vs-num { background: var(--amber); color: var(--amber-ink); }
  .vs-summary {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid rgba(22, 19, 18, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 800;
    font-size: 15px;
  }
  .vs-new .vs-summary {
    border-top-color: var(--line-strong);
    color: var(--red-deep);
    font-size: 16.5px;
  }

  /* KHUNG HÌNH ĐỘNG (LIVE ANIMATION STAGE) TRONG 2 THẺ SO SÁNH */
  .vs-anim-stage {
    margin-bottom: 18px;
    border-radius: 16px;
    padding: 14px;
    position: relative;
    overflow: hidden;
  }
  .vs-old .vs-anim-stage {
    background: #E8E3DA;
    border: 1px solid rgba(22, 19, 18, 0.14);
  }
  .vs-new .vs-anim-stage {
    background: linear-gradient(180deg, #FFFDF8 0%, #FAF5EC 100%);
    border: 1.5px solid rgba(245, 184, 0, 0.55);
    box-shadow: inset 0 1px 0 #FFFFFF, 0 8px 20px -6px rgba(22, 19, 18, 0.06);
  }
  .vs-anim-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 12px;
    font-weight: 800;
  }
  .vs-timer-pill {
    font-family: var(--ff-mono);
    font-size: 12px;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 99px;
  }
  .vs-old .vs-timer-pill {
    background: rgba(200, 55, 45, 0.12);
    color: var(--red-deep);
    border: 1px solid rgba(200, 55, 45, 0.28);
  }
  .vs-new .vs-timer-pill {
    background: var(--ok-soft);
    color: var(--ok);
    border: 1px solid rgba(24, 134, 75, 0.3);
  }

  /* Hiệu ứng chuyển cảnh mượt (Silky Smooth Cross-fade & Slide) */
  .smooth-swap {
    transition: opacity 0.32s cubic-bezier(0.22, 1, 0.36, 1), transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
  }
  .smooth-swap.is-fading {
    opacity: 0.08;
    transform: translateY(5px);
  }

  /* Thanh tiến trình mượt trong khung mô phỏng */
  .vs-progress-track {
    height: 4px;
    border-radius: 99px;
    background: rgba(0, 0, 0, 0.08);
    overflow: hidden;
    margin-bottom: 11px;
  }
  .vs-new .vs-progress-track {
    background: rgba(245, 184, 0, 0.22);
  }
  .vs-progress-fill {
    height: 100%;
    border-radius: 99px;
    transition: width 0.65s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: width;
  }
  .vs-old .vs-progress-fill {
    background: linear-gradient(90deg, #E03E33 0%, #C8372D 100%);
    width: 16.6%;
  }
  .vs-new .vs-progress-fill {
    background: linear-gradient(90deg, var(--amber) 0%, #18864B 100%);
    width: 33.3%;
  }

  /* Màn hình giả lập bên trái: 2 cửa sổ phải chuyển qua lại */
  .old-dual-wins {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
    position: relative;
  }
  .old-mini-win {
    background: #FFFFFF;
    border: 1.5px solid rgba(22, 19, 18, 0.14);
    border-radius: 10px;
    padding: 8px 9px;
    font-size: 11.5px;
    color: var(--ink);
    min-height: 102px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.45s ease, box-shadow 0.55s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.45s ease;
    will-change: transform, opacity;
  }
  .old-mini-win.dim {
    opacity: 0.52;
    transform: translateY(2px) scale(0.975);
  }
  .old-mini-win.focus-win {
    border-color: var(--red);
    box-shadow: 0 10px 22px -4px rgba(200, 55, 45, 0.22);
    opacity: 1;
    transform: translateY(-3px) scale(1.015);
  }
  .old-win-head {
    font-size: 10.5px;
    font-weight: 800;
    color: var(--ink-3);
    padding-bottom: 4px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .old-win-box {
    margin-top: 6px;
    background: var(--bg);
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 5px 7px;
    font-size: 11px;
    min-height: 40px;
    line-height: 1.35;
    font-family: var(--ff-cjk);
    transition: background-color 0.35s ease, border-color 0.35s ease, opacity 0.28s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
  }
  .old-win-box.selected-txt {
    background: #DBEAFE;
    border-color: #3B82F6;
  }
  .old-action-tag {
    margin-top: 5px;
    font-size: 10px;
    font-weight: 800;
    color: var(--red);
    font-family: var(--ff-mono);
    transition: opacity 0.28s ease, color 0.28s ease;
  }

  /* Màn hình giả lập bên phải: 1 cửa sổ duy nhất có BeeKey (Tone sáng chuẩn văn phòng) */
  .new-single-win {
    background: #FFFFFF;
    border: 1.5px solid rgba(200, 55, 45, 0.25);
    border-radius: 12px;
    padding: 10px 12px;
    min-height: 118px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    box-shadow: 0 6px 18px rgba(22, 19, 18, 0.05);
    transition: border-color 0.45s ease, box-shadow 0.45s ease;
  }
  .new-win-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--ink-2);
    padding-bottom: 6px;
    border-bottom: 1px solid var(--line);
  }
  .new-hud-pop {
    margin: 6px 0;
    background: #FFFBF0;
    border: 1px solid rgba(245, 184, 0, 0.45);
    border-left: 3.5px solid var(--amber);
    border-radius: 7px;
    padding: 6px 9px;
    font-size: 11.5px;
    font-family: var(--ff-cjk);
    color: var(--ink);
    font-weight: 600;
    opacity: 0;
    transform: translateY(6px) scale(0.98);
    transition: opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1), transform 0.42s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.35s ease;
    will-change: opacity, transform;
  }
  .new-hud-pop.show {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  .new-compose-line {
    background: #F8F6F1;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    padding: 6px 9px;
    font-size: 11.5px;
    color: var(--ink);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    transition: border-color 0.35s ease;
  }
  .new-sent-pill {
    background: #95EC69;
    color: #111;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 99px;
    font-size: 10.5px;
    transition: background-color 0.35s cubic-bezier(0.22, 1, 0.36, 1), color 0.35s ease, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    white-space: nowrap;
  }
  .new-sent-pill.pressing {
    transform: translateY(2px) scale(0.93);
  }

  /* Làm nổi bật bước đang chạy trong danh sách bên dưới */
  .vs-step-item {
    transition: transform 0.38s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.38s cubic-bezier(0.22, 1, 0.36, 1);
  }
  .vs-old .vs-step-item.active-step {
    background: #FFFFFF;
    border-color: var(--red);
    color: var(--ink);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(200, 55, 45, 0.12);
  }
  .vs-old .vs-step-item.active-step .vs-num {
    background: var(--red);
    color: #fff;
  }
  .vs-new .vs-step-item.active-step {
    background: #FFF9EB;
    border-color: var(--amber);
    color: var(--ink);
    transform: translateX(4px);
    box-shadow: 0 6px 16px rgba(245, 184, 0, 0.18);
  }
  .vs-new .vs-step-item.active-step .vs-num {
    background: var(--red);
    color: #fff;
  }

  /* =========================================================
     PHẦN 3: BA BƯỚC NGAY TRONG Ô CHAT
     ========================================================= */
  .steps-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
  .step-card {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--bub-lg);
    padding: 28px;
    box-shadow: 0 12px 32px -8px rgba(22, 19, 18, 0.06);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
  }
  .step-num-big {
    font-family: var(--ff-mono);
    font-size: 13px;
    font-weight: 800;
    color: var(--red);
    background: var(--red-soft);
    padding: 4px 10px;
    border-radius: 99px;
    display: inline-block;
    margin-bottom: 14px;
  }
  .step-visual {
    background: var(--bg);
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    padding: 20px;
    min-height: 148px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-bottom: 20px;
  }
  .step-card h3 {
    font-size: 19.5px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    line-height: 1.25;
  }
  .step-card p {
    font-size: 15px;
    color: var(--ink-2);
  }

  /* =========================================================
     PHẦN 4: 4 ĐIỂM KHÁC BIỆT CHO CÔNG VIỆC (BENTO TƯƠNG TÁC)
     ========================================================= */
  .bento {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px;
  }
  .b-card {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--bub-xl);
    padding: clamp(26px, 3vw, 38px);
    box-shadow: 0 14px 36px -10px rgba(22, 19, 18, 0.07);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    position: relative;
  }
  .b-span-7 { grid-column: span 7; }
  .b-span-5 { grid-column: span 5; }
  .b-span-8 { grid-column: span 8; }
  .b-span-4 { grid-column: span 4; }
  .b-span-12 { grid-column: span 12; }
  .b-card.dark-card {
    background: linear-gradient(180deg, #FFFDF7 0%, #FAF4E8 100%);
    color: var(--ink);
    border-color: rgba(245, 184, 0, 0.55);
  }
  .b-card.dark-card p { color: var(--ink-2); }
  .b-card h3 {
    font-size: clamp(1.3rem, 1.1rem + 0.55vw, 1.65rem);
    font-weight: 900;
    letter-spacing: -0.025em;
    line-height: 1.2;
  }
  .b-card > div > p {
    margin-top: 10px;
    color: var(--ink-2);
    font-size: 15px;
  }

  /* Ô 1: Giữ đúng số, giá, mã hàng */
  .num-shield-box {
    margin-top: 24px;
    background: var(--bg);
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    padding: 18px;
  }
  .ns-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 14px;
    flex-wrap: wrap;
  }
  .ns-tab {
    border: 1px solid var(--line-strong);
    background: var(--surface);
    padding: 6px 13px;
    border-radius: 9px;
    font-size: 12.5px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.15s;
  }
  .ns-tab.active {
    background: var(--red);
    color: #fff;
    border-color: var(--red);
  }
  .ns-pair {
    display: grid;
    gap: 10px;
  }
  .ns-row {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 14.5px;
    font-family: var(--ff-cjk);
  }
  .ns-row small {
    display: block;
    font-size: 11.5px;
    font-weight: 800;
    color: var(--ink-3);
    margin-bottom: 4px;
  }

  /* Ô 2: Chọn giọng văn */
  .tone-switcher {
    margin-top: 22px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .tone-seg {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, minmax(0, 1fr)));
    background: #EFEAD9;
    padding: 4px;
    border-radius: 12px;
    gap: 4px;
    border: 1px solid var(--line-strong);
  }
  .t-btn {
    border: 0;
    background: transparent;
    color: var(--ink-2);
    font-weight: 800;
    font-size: 13px;
    padding: 9px;
    border-radius: 9px;
    cursor: pointer;
    transition: all 0.15s;
  }
  .t-btn.active {
    background: var(--red);
    color: #fff;
    box-shadow: 0 2px 8px rgba(200, 55, 45, 0.25);
  }
  .tone-output {
    background: #FFFFFF;
    border: 1.5px solid var(--line-strong);
    border-radius: 14px;
    padding: 16px;
    font-family: var(--ff-cjk);
    box-shadow: 0 4px 14px rgba(22, 19, 18, 0.04);
  }
  .tone-output .t-jp {
    font-size: 15.5px;
    color: var(--ink);
    font-weight: 800;
  }
  .tone-output .t-explain {
    margin-top: 8px;
    font-size: 12.5px;
    color: #9A6700;
    font-weight: 700;
  }

  /* Ô 3: Một tin, cả nhóm đều đọc được */
  .group-interactive {
    margin-top: 22px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 18px;
    align-items: center;
    background: var(--red-soft);
    border-radius: 20px;
    padding: 20px;
  }
  .g-checks {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .g-check {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 13.5px;
    font-weight: 700;
    cursor: pointer;
    border: 1px solid rgba(200, 55, 45, 0.15);
  }
  .g-check input {
    width: 16px;
    height: 16px;
    accent-color: var(--red);
  }
  .g-preview-bubble {
    background: #95EC69;
    color: #111;
    border-radius: 18px 18px 4px 18px;
    padding: 14px 16px;
    font-family: var(--ff-cjk);
    font-size: 13.5px;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  }
  .g-line {
    padding-bottom: 6px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }
  .g-line:last-child {
    padding-bottom: 0;
    border-bottom: 0;
  }

  /* Ô 4: Nhớ ngôn ngữ theo từng cuộc chat */
  .mem-list {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .mem-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 14px;
    border-radius: 12px;
    background: var(--bg);
    border: 1px solid var(--line);
    cursor: pointer;
    transition: all 0.15s;
    font-size: 13.5px;
    font-weight: 700;
  }
  .mem-item.active {
    background: var(--red-soft);
    border-color: var(--red);
  }

  /* Ô 5: Từ điển thuật ngữ riêng (Custom Glossary) */
  .glossary-grid {
    margin-top: 22px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: 20px;
    align-items: stretch;
  }
  .gloss-left {
    background: var(--bg);
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 12px;
  }
  .gloss-domain-tabs {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
  }
  .gloss-tab {
    border: 1px solid var(--line-strong);
    background: var(--surface);
    padding: 6px 12px;
    border-radius: 9px;
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.15s;
    color: var(--ink-2);
  }
  .gloss-tab.active {
    background: var(--red);
    color: #FFFFFF;
    border-color: var(--red);
  }
  .gloss-term-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .gloss-term-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 11px;
    padding: 9px 12px;
    font-size: 13px;
  }
  .gloss-term-vi {
    font-weight: 800;
    color: var(--ink);
  }
  .gloss-term-arrow {
    color: var(--ink-3);
    font-family: var(--ff-mono);
    font-size: 12px;
  }
  .gloss-term-target {
    font-family: var(--ff-cjk);
    font-weight: 800;
    background: rgba(245, 184, 0, 0.22);
    color: #5C4300;
    border: 1px solid rgba(245, 184, 0, 0.55);
    padding: 2px 9px;
    border-radius: 6px;
  }
  .gloss-right {
    background: linear-gradient(180deg, #FFFDF7 0%, #FAF5EB 100%);
    color: var(--ink);
    border-radius: 18px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 14px;
    border: 1.5px solid rgba(245, 184, 0, 0.55);
    box-shadow: 0 8px 24px -8px rgba(22, 19, 18, 0.06);
  }
  .gloss-right-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line-strong);
  }
  .gloss-switch-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--amber-soft);
    border: 1px solid rgba(245, 184, 0, 0.65);
    color: #7A5200;
    font-size: 12px;
    font-weight: 800;
    padding: 5px 12px;
    border-radius: 99px;
    cursor: pointer;
    transition: all 0.15s;
  }
  .gloss-switch-btn.off {
    background: var(--bg-warm);
    border-color: var(--line-strong);
    color: var(--ink-3);
  }
  .gloss-compare-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 12px;
  }
  .gloss-box {
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-radius: 12px;
    padding: 12px;
    font-size: 13.5px;
    font-family: var(--ff-cjk);
  }
  .gloss-box.good {
    background: #FFFBF0;
    border: 1.5px solid var(--amber);
    box-shadow: 0 4px 12px rgba(245, 184, 0, 0.12);
  }
  .gloss-box small {
    display: block;
    font-family: var(--ff-sans);
    font-size: 11px;
    font-weight: 800;
    margin-bottom: 5px;
    color: var(--ink-3);
  }
  .gloss-box.good small {
    color: #8F6100;
  }

  /* =========================================================
     PHẦN 5: QUYỀN RIÊNG TƯ - CHAT CỦA BẠN LÀ CỦA BẠN (TONE SÁNG BẢO MẬT)
     ========================================================= */
  .vault-box {
    background: linear-gradient(135deg, #F2FBF6 0%, #FFFFFF 55%, #FFFDF5 100%);
    color: var(--ink);
    border: 1.5px solid rgba(24, 134, 75, 0.28);
    border-radius: var(--bub-xl);
    padding: clamp(28px, 4.5vw, 56px);
    box-shadow: 0 24px 56px -14px rgba(24, 134, 75, 0.12), 0 4px 16px rgba(22, 19, 18, 0.04);
    position: relative;
    overflow: hidden;
  }
  .vault-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 32px;
    align-items: center;
    margin-top: 32px;
  }
  .pipeline {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, minmax(0, 1fr)));
    gap: 12px;
  }
  .pipe-node {
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 6px 18px rgba(22, 19, 18, 0.04);
  }
  .pipe-node.zero-log {
    border: 1.5px solid rgba(24, 134, 75, 0.45);
    background: linear-gradient(180deg, #F0FDF6 0%, #FFFFFF 100%);
  }
  .pipe-badge {
    display: inline-block;
    font-size: 11.5px;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 6px;
    background: var(--bg-warm);
    color: var(--ink-2);
    margin-bottom: 10px;
  }
  .pipe-node.zero-log .pipe-badge {
    background: var(--ok);
    color: #FFFFFF;
  }
  .pipe-node h4 {
    font-size: 15.5px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--ink);
  }
  .pipe-node p {
    font-size: 13px;
    color: var(--ink-2);
    line-height: 1.5;
  }

  .pw-demo-card {
    background: #FFFFFF;
    border: 1.5px solid var(--line-strong);
    border-radius: 18px;
    padding: 22px;
    box-shadow: 0 8px 24px rgba(22, 19, 18, 0.05);
  }
  .pw-demo-card h4 {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--ink);
  }
  .pw-demo-card p {
    font-size: 13px;
    color: var(--ink-2);
    margin-bottom: 14px;
  }
  .pw-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #FAF8F3;
    border: 1.5px solid var(--line-strong);
    border-radius: 12px;
    padding: 10px 14px;
    transition: border-color 0.2s;
  }
  .pw-input-wrap:focus-within {
    border-color: var(--ok);
  }
  .pw-input-wrap input {
    flex: 1;
    background: transparent;
    border: 0;
    color: var(--ink);
    outline: none;
    font-size: 14px;
    font-weight: 700;
  }
  .pw-status-pill {
    font-size: 11.5px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 99px;
    background: var(--ok-soft);
    color: var(--ok);
    border: 1px solid rgba(24, 134, 75, 0.25);
    white-space: nowrap;
  }

  /* =========================================================
     PHẦN 6: BẢNG GIÁ (#bang-gia)
     ========================================================= */
  .plans-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: stretch;
  }
  .plan-card {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--bub-xl);
    padding: 34px;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 12px 32px -8px rgba(22, 19, 18, 0.06);
  }
  .plan-card.pro-pick {
    background: linear-gradient(165deg, var(--red-bright) 0%, var(--red-deep) 100%);
    color: #fff;
    border-color: var(--red);
    box-shadow: 0 28px 56px -12px rgba(200, 55, 45, 0.45);
    transform: translateY(-8px);
  }
  .plan-badge {
    position: absolute;
    top: 20px;
    right: 24px;
    background: var(--amber);
    color: var(--amber-ink);
    font-size: 11.5px;
    font-weight: 900;
    padding: 4px 11px;
    border-radius: 10px 10px 10px 3px;
  }
  .plan-card h3 { font-size: 23px; font-weight: 900; }
  .plan-price {
    margin-top: 16px;
    font-size: 40px;
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1;
  }
  .plan-price small {
    font-size: 15px;
    font-weight: 600;
    opacity: 0.85;
    letter-spacing: 0;
  }
  .plan-sub {
    margin-top: 8px;
    font-size: 14px;
    opacity: 0.9;
  }
  .plan-list {
    margin: 24px 0 28px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
    font-size: 14.5px;
    font-weight: 500;
  }
  .plan-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
  }
  .plan-list li::before {
    content: "";
    width: 11px;
    height: 9px;
    border-radius: 4px 4px 4px 1px;
    background: var(--red);
    margin-top: 6px;
    flex: none;
  }
  .plan-card.pro-pick .plan-list li::before {
    background: var(--amber);
  }

  /* =========================================================
     PHẦN 7: CÂU HỎI THƯỜNG GẶP - HỎI ĐÁP (#hoi-dap)
     ========================================================= */
  .faq-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }
  .faq-item {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    overflow: hidden;
    transition: border-color 0.2s, box-shadow 0.2s;
  }
  .faq-item.open {
    border-color: var(--red);
    box-shadow: 0 12px 28px -8px rgba(200, 55, 45, 0.14);
  }
  .faq-q {
    width: 100%;
    border: 0;
    background: transparent;
    padding: 18px 20px;
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    font-size: 15.5px;
    font-weight: 800;
    color: var(--ink);
    cursor: pointer;
    line-height: 1.35;
  }
  .faq-q:hover {
    color: var(--red);
  }
  .faq-icon {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: var(--bg-warm);
    color: var(--ink-2);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 900;
    flex: none;
    transition: transform 0.2s, background-color 0.2s, color 0.2s;
  }
  .faq-item.open .faq-icon {
    background: var(--red);
    color: #fff;
    transform: rotate(45deg);
  }
  .faq-a {
    display: none;
    padding: 0 20px 18px;
    font-size: 14.5px;
    color: var(--ink-2);
    line-height: 1.6;
    border-top: 1px dashed var(--line);
    padding-top: 12px;
  }
  .faq-item.open .faq-a {
    display: block;
    animation: popIn 0.18s var(--ease);
  }

  /* Video hướng dẫn cài trên iPhone (trang Tải về, chỉ bản tiếng Việt) */
  .dl-video {
    display: flex;
    align-items: center;
    gap: 18px;
    margin: 18px 0 0;
    padding: 14px;
    background: var(--bg-warm);
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    line-height: 1.45;
  }
  .dl-video[hidden] {
    display: none;
  }
  .dl-video video {
    display: block;
    width: 180px;
    height: auto;
    aspect-ratio: 9 / 16;
    flex: none;
    border-radius: 12px;
    background: #000;
  }
  .dl-video figcaption strong {
    display: block;
    font-size: 14.5px;
    color: var(--ink);
    margin-bottom: 4px;
  }
  .dl-video figcaption span {
    font-size: 13px;
    color: var(--ink-2);
  }
  @media (max-width: 600px) {
    .dl-video {
      flex-direction: column;
      align-items: stretch;
    }
    .dl-video video {
      width: 100%;
      max-width: 320px;
      margin: 0 auto;
    }
  }

  /* Mã QR cho iPhone / Android và Bảng tra cứu phím tắt trang Tải về */
  .dl-qr-wrap {
    display: none;
    align-items: center;
    gap: 18px;
    max-width: 100%;
    box-sizing: border-box;
    background: var(--bg-warm);
    border: 1.5px dashed rgba(200, 55, 45, 0.35);
    border-radius: 16px;
    padding: 14px 20px 14px 14px;
    margin-top: 16px;
    line-height: 1.45;
  }
  .dl-qr-wrap.show {
    display: inline-flex;
    animation: popIn 0.2s var(--ease);
  }
  /* SVG đã có lề trắng 4 ô; khung chỉ bo góc, không đệm thêm. SVG co theo khung để không tràn ra ngoài */
  .dl-qr-svg {
    display: block;
    width: 96px;
    height: 96px;
    box-sizing: border-box;
    overflow: hidden;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--line-strong);
    box-shadow: 0 4px 12px -6px rgba(22, 19, 18, 0.15);
    flex: none;
  }
  .dl-qr-svg svg {
    display: block;
    width: 100%;
    height: 100%;
  }
  .dl-qr-wrap > div {
    min-width: 0;
  }
  #dl-qr-title {
    margin-bottom: 4px;
  }
  .dl-cheat-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
  .dl-cheat-card {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 20px;
    padding: 22px;
    box-shadow: 0 10px 26px -8px rgba(22, 19, 18, 0.05);
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .dl-cheat-card h3 {
    font-size: 17.5px;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
  }
  .dl-sc-row {
    display: flex;
    flex-direction: column;
    gap: 3px;
    font-size: 13px;
  }
  .dl-sc-row span {
    color: var(--ink-3);
    font-size: 12px;
    font-weight: 700;
  }
  .dl-sc-row strong {
    color: var(--ink);
    font-weight: 800;
  }

  /* =========================================================
     VIEW 2: TRANG TẢI ỨNG DỤNG (/tai-ve)
     ========================================================= */

  .dl-hero {
    background: linear-gradient(180deg, #FFFFFF 0%, #FAF5EC 55%, #F4EFE6 100%);
    color: var(--ink);
    padding: 48px 0 64px;
    border-bottom: 1px solid var(--line-strong);
  }
  .os-dock {
    display: inline-flex;
    background: #EFEBE2;
    border: 1px solid var(--line-strong);
    padding: 6px;
    border-radius: 20px;
    gap: 6px;
    margin-top: 24px;
    flex-wrap: wrap;
  }
  .os-dock-btn {
    border: 0;
    background: transparent;
    padding: 11px 22px;
    border-radius: 14px;
    font-weight: 800;
    font-size: 14.5px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ink-2);
    transition: all 0.18s var(--ease);
  }
  .os-dock-btn:hover { color: var(--ink); background: rgba(255, 255, 255, 0.75); }
  .os-dock-btn.active {
    background: var(--red);
    color: #fff;
    box-shadow: 0 4px 16px rgba(200, 55, 45, 0.35);
  }

  .unbox-card {
    margin-top: 28px;
    background: var(--surface);
    color: var(--ink);
    border: 1.5px solid var(--line-strong);
    border-radius: var(--bub-xl);
    padding: clamp(28px, 4vw, 48px);
    box-shadow: 0 24px 56px -14px rgba(22, 19, 18, 0.12), 0 4px 16px rgba(22, 19, 18, 0.04);
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: center;
  }
  .unbox-meta {
    font-size: 13px;
    color: var(--ok);
    font-weight: 800;
    margin-bottom: 8px;
  }
  .unbox-card h2 {
    font-size: clamp(1.9rem, 1.5rem + 1.5vw, 2.6rem);
    font-weight: 900;
    letter-spacing: -0.03em;
  }
  .unbox-specs {
    margin-top: 8px;
    font-size: 14px;
    color: var(--ink-2);
  }
  .unbox-steps {
    margin-top: 26px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, minmax(0, 1fr)));
    gap: 12px;
  }
  .u-step {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    font-size: 13px;
  }
  .u-step b {
    display: block;
    font-size: 13.5px;
    color: var(--red);
    margin-bottom: 4px;
  }

  .os-mockup-stage {
    background: linear-gradient(180deg, #FAF7F1 0%, #F2EDE3 100%);
    border-radius: 24px;
    padding: 20px;
    color: var(--ink);
    box-shadow: inset 0 1px 0 #FFFFFF, 0 14px 34px -8px rgba(22, 19, 18, 0.1);
    min-height: 330px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1.5px solid var(--line-strong);
  }
  .os-stage-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 12px;
    color: var(--ink-2);
    font-weight: 700;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line-strong);
  }
  .os-stage-body {
    margin: 14px 0;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  /* 4 khung minh hoạ riêng biệt theo từng hệ điều hành (Tone sáng tinh tế) */
  .os-scene { display: none; animation: popIn 0.24s var(--ease); }
  .os-scene.active { display: block; }

  /* 1. Minh hoạ macOS: Thanh Menu Bar sáng + Cửa sổ WeChat Mac trắng + Nút BK nổi */
  .mac-menubar {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--line-strong);
    border-radius: 10px 10px 0 0;
    padding: 6px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11.5px;
    font-weight: 700;
    color: var(--ink);
  }
  .mac-menubar-right {
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .mac-menu-bk {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--red);
    color: #fff;
    padding: 1px 7px;
    border-radius: 5px;
    font-size: 10.5px;
    font-weight: 800;
  }
  .mac-win {
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-top: 0;
    border-radius: 0 0 14px 14px;
    padding: 14px;
    box-shadow: 0 10px 24px rgba(22, 19, 18, 0.06);
  }

  /* 2. Minh hoạ Windows: Cửa sổ Zalo PC sáng + Khay hệ thống (System Tray) góc phải dưới */
  .win-frame {
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    border-radius: 12px 12px 0 0;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(22, 19, 18, 0.05);
  }
  .win-titlebar {
    background: #F1EFEA;
    padding: 6px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11.5px;
    color: var(--ink);
    border-bottom: 1px solid var(--line-strong);
  }
  .win-ctrls {
    display: flex;
    gap: 10px;
    font-family: var(--ff-mono);
    font-size: 11px;
    color: var(--ink-3);
  }
  .win-taskbar {
    background: #E8E4DC;
    border: 1px solid var(--line-strong);
    border-top: 0;
    border-radius: 0 0 12px 12px;
    padding: 7px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--ink-2);
    font-weight: 600;
  }
  .win-tray {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #FFFFFF;
    padding: 3px 9px;
    border-radius: 6px;
    border: 1px solid rgba(245, 184, 0, 0.65);
  }

  /* 3. Minh hoạ iPhone (iOS): Khung điện thoại + Bàn phím BeeKey có thanh dịch ngược & nút Gửi cam */
  .phone-frame {
    max-width: 310px;
    margin: 0 auto;
    background: #FFFFFF;
    border: 2.5px solid #D6D1C7;
    border-radius: 26px;
    padding: 10px 10px 8px;
    box-shadow: 0 14px 32px rgba(22, 19, 18, 0.12);
  }
  .phone-notch {
    width: 68px;
    height: 14px;
    background: #27272A;
    border-radius: 99px;
    margin: 0 auto 8px;
  }
  .phone-chat-area {
    background: #F6F4EF;
    color: var(--ink);
    border-radius: 14px 14px 0 0;
    padding: 9px 10px;
    font-size: 12px;
    border: 1px solid var(--line);
    border-bottom: 0;
  }
  .ios-kb {
    background: #E5E7EB;
    color: #111827;
    border-radius: 0 0 16px 16px;
    padding: 7px 6px 6px;
  }
  .ios-kb-toolbar {
    background: #FFFFFF;
    color: var(--ink);
    border: 1px solid var(--line-strong);
    border-radius: 9px;
    padding: 6px 8px;
    margin-bottom: 6px;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
  }
  .kb-row {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-bottom: 4px;
  }
  .kb-k {
    background: #FFFFFF;
    color: #111;
    border-radius: 5px;
    padding: 5px 0;
    flex: 1;
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    box-shadow: 0 1px 0 #9CA3AF;
  }
  .kb-send-ios {
    background: var(--send);
    color: #fff;
    flex: 2.2;
    font-weight: 800;
  }

  /* 4. Minh hoạ Android: Bàn phím Telex sáng hiện đại + Thanh công cụ nút Đọc / 中 / EN / Nhật / Hàn */
  .and-kb {
    background: #EAECEF;
    color: var(--ink);
    border-radius: 0 0 16px 16px;
    padding: 7px 6px 6px;
    border-top: 1px solid var(--line-strong);
  }
  .and-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
    margin-bottom: 6px;
  }
  .and-pill {
    font-size: 10.5px;
    font-weight: 800;
    padding: 4px 7px;
    border-radius: 6px;
    background: #FFFFFF;
    color: var(--ink-2);
    border: 1px solid var(--line-strong);
    white-space: nowrap;
  }
  .and-pill.pri {
    background: var(--zh);
    color: var(--zh-ink);
    border-color: var(--zh);
  }
  .and-pill.read {
    background: var(--ok-soft);
    color: var(--ok);
    border: 1px solid rgba(24, 134, 75, 0.35);
  }
  .and-k {
    background: #FFFFFF;
    color: var(--ink);
    border-radius: 5px;
    padding: 5px 0;
    flex: 1;
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    box-shadow: 0 1px 0 #CBD5E1;
  }
  .and-k.dich {
    background: var(--red);
    color: #fff;
    flex: 2.1;
    font-weight: 800;
  }

  /* =========================================================
     CHÂN TRANG CHUYÊN NGHIỆP TONE SÁNG (LIGHT ENTERPRISE FOOTER)
     ========================================================= */
  .site-footer {
    background: linear-gradient(180deg, #F5F1E9 0%, #ECE6DA 100%);
    color: var(--ink-2);
    padding: clamp(56px, 7vw, 88px) 0 36px;
    border-top: 1.5px solid var(--line-strong);
    position: relative;
    overflow: hidden;
  }
  .site-footer::before {
    content: "";
    position: absolute;
    top: -180px;
    right: -80px;
    width: 560px;
    height: 560px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(200, 55, 45, 0.08) 0%, rgba(245, 184, 0, 0.08) 45%, transparent 70%);
    pointer-events: none;
  }

  /* Tầng 1: Khối kêu gọi hành động cuối trang (Đỏ thương hiệu ấm áp & nổi bật) */
  .foot-cta-banner {
    position: relative;
    z-index: 1;
    background: linear-gradient(135deg, #D9382E 0%, #B8291F 60%, #9E1F16 100%);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--bub-xl);
    padding: clamp(28px, 3.8vw, 42px);
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) auto;
    align-items: center;
    gap: 32px;
    box-shadow: 0 24px 52px -12px rgba(200, 55, 45, 0.32);
    margin-bottom: clamp(48px, 6vw, 72px);
  }
  .foot-cta-copy {
    max-width: 640px;
  }
  .foot-cta-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 800;
    color: #FFFDF7;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.32);
    padding: 4px 12px;
    border-radius: 99px;
    margin-bottom: 12px;
  }
  .foot-cta-copy h3 {
    font-size: clamp(1.45rem, 1.15rem + 1vw, 2rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.22;
    color: #fff;
  }
  .foot-cta-copy p {
    margin-top: 8px;
    font-size: 14.5px;
    color: rgba(255, 255, 255, 0.92);
  }
  .foot-cta-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
  }
  .foot-os-pills {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: nowrap;
  }
  .foot-os-pill {
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.14);
    color: #FFFFFF;
    font-size: 12px;
    font-weight: 700;
    padding: 5px 10px;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s;
  }
  .foot-os-pill:hover {
    background: #FFFFFF;
    border-color: #FFFFFF;
    color: var(--red-deep);
  }

  /* Tầng 2: Lưới điều hướng 5 cột chuẩn sản phẩm (Tone sáng thanh lịch) */
  .foot-main-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.05fr) minmax(0, 1.2fr);
    gap: clamp(20px, 2.4vw, 34px);
    padding-bottom: clamp(40px, 5vw, 56px);
    border-bottom: 1px solid var(--line-strong);
  }
  .foot-brand-col {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding-right: 8px;
  }
  .foot-word {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 900;
    font-size: 26px;
    letter-spacing: -0.035em;
    color: var(--ink);
    line-height: 1;
  }
  .foot-word img {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(200, 55, 45, 0.25);
  }
  .foot-desc {
    font-size: 13.5px;
    color: var(--ink-2);
    line-height: 1.62;
    max-width: 36ch;
  }
  .foot-lang-badges {
    display: grid;
    grid-template-columns: repeat(2, max-content);
    gap: 6px;
  }
  .foot-lang-badges span {
    font-size: 11.5px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 6px 6px 6px 2px;
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    white-space: nowrap;
  }
  .foot-beeca-box {
    margin-top: 4px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(135deg, #12151E 0%, #1C202B 100%);
    border: 1px solid rgba(245, 184, 0, 0.35);
    border-radius: 14px;
    padding: 11px 16px;
    width: fit-content;
    box-shadow: 0 10px 24px -6px rgba(18, 21, 30, 0.28);
  }
  .foot-beeca-box img {
    height: 36px;
    width: auto;
    display: block;
  }
  .foot-beeca-box div {
    font-size: 12px;
    line-height: 1.35;
    color: #CBD5E1;
    white-space: nowrap;
  }
  .foot-beeca-box strong {
    display: block;
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 800;
  }

  .foot-col h4 {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ink);
    margin-bottom: 16px;
    white-space: nowrap;
  }
  .foot-links {
    display: flex;
    flex-direction: column;
    gap: 11px;
    font-size: 13.5px;
  }
  .foot-links a, .foot-links button {
    border: 0;
    background: none;
    padding: 0;
    text-align: left;
    color: var(--ink-2);
    font-weight: 600;
    cursor: pointer;
    transition: color 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    line-height: 1.35;
    white-space: nowrap;
  }
  .foot-links a:hover, .foot-links button:hover {
    color: var(--red);
  }
  .foot-tag-mini {
    font-size: 10.5px;
    font-weight: 800;
    padding: 1px 6px;
    border-radius: 4px;
    background: var(--red-soft);
    color: var(--red-deep);
    white-space: nowrap;
    flex: none;
  }
  .foot-contact-item {
    font-size: 13.5px;
    color: var(--ink-2);
    line-height: 1.5;
    margin-bottom: 12px;
  }
  .foot-contact-item strong {
    display: block;
    color: var(--ink-3);
    font-size: 12px;
    margin-bottom: 2px;
  }
  .foot-contact-item a {
    color: var(--red-deep);
    font-weight: 800;
    white-space: nowrap;
  }
  .foot-contact-item a:hover { color: var(--red-bright); }

  /* Tầng 3: Thanh bản quyền & trạng thái hệ thống */
  .foot-bottom {
    position: relative;
    z-index: 1;
    padding-top: 26px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--ink-2);
    font-weight: 600;
  }
  .foot-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    border-radius: 99px;
    background: #FFFFFF;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    font-size: 12.5px;
    font-weight: 700;
    white-space: nowrap;
  }
  .foot-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #10B981;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    flex: none;
  }
  .foot-legal-links {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
  }
  .foot-legal-links a {
    color: var(--ink-2);
    font-weight: 700;
    white-space: nowrap;
    transition: color 0.15s;
  }
  .foot-legal-links a:hover { color: var(--red); }

  @media (max-width: 1080px) {
    .hero-grid, .vs-grid, .bento, .vault-grid, .plans-grid, .unbox-card, .steps-grid, .foot-cta-banner, .glossary-grid, .faq-grid {
      grid-template-columns: minmax(0, 1fr);
    }
    .dl-cheat-grid { grid-template-columns: repeat(2, minmax(0, minmax(0, 1fr))); }
    .b-span-7, .b-span-5, .b-span-8, .b-span-4, .b-span-12 { grid-column: span 1; }
    .plan-card.pro-pick { transform: none; }
    .nav-links { display: none; }
    .mobile-menu-btn { display: inline-flex; }
    .foot-main-grid { grid-template-columns: repeat(2, minmax(0, minmax(0, 1fr))); }
    .foot-brand-col { grid-column: span 2; }
    .foot-cta-actions { align-items: flex-start; }
    .foot-os-pills { flex-wrap: wrap; }
  }
  @media (max-width: 640px) {
    .partner-tabs { grid-template-columns: repeat(2, minmax(0, minmax(0, 1fr))); }
    .pipeline, .unbox-steps, .group-interactive, .foot-main-grid, .gloss-compare-row, .dl-cheat-grid, .mobile-nav-list { grid-template-columns: minmax(0, 1fr); }
    .foot-brand-col { grid-column: span 1; }
  }

  /* Điện thoại: nút tải ở thanh trên tràn và che nút menu (bản thiết kế gốc cũng vậy) - ẩn, đã có nút tải lớn ở đầu trang */
  @media (max-width: 600px) {
    #nav-dl-btn { display: none; }
    .eyebrow-dark { max-width: 100%; flex-wrap: wrap; }
    /* Bản dịch dài hơn tiếng Việt: cụm .nb và nhãn được xuống dòng thay vì tràn ngang */
    .nb, .sec-tag, .pw-status-pill, .foot-status, .foot-status span { white-space: normal; }
    .foot-status { flex-wrap: wrap; max-width: 100%; }
    .sec-tag { max-width: 100%; }
    .b-card, .b-card * { min-width: 0; }
  }

  /* Logo nền tảng (thay emoji 🍎 🪟 📱 🤖) */
  .os-ico { width: 1.15em; height: 1.15em; flex: none; display: inline-block; vertical-align: -0.2em; }
  .os-dock-btn .os-ico, .foot-os-pill .os-ico, .foot-links .os-ico { margin-right: 6px; }
  .os-dock-btn.active .os-ico path[fill="#000"], .foot-cta-banner .os-ico path[fill="#000"] { fill: currentColor; }

  /* Cách dùng: 2 bước (chủ dự án 27/10/2026: trên Mac chỉ 2 bước - gõ, Enter để dịch và gửi) */
  .steps-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  @media (max-width: 1080px) { .steps-grid.two { grid-template-columns: minmax(0, 1fr); } }

  /* Ngắt dòng tiêu đề theo cụm nghĩa (chủ dự án 27/10/2026: không để chữ lẻ rơi xuống dòng cuối) */
  h1, h2, h3 { text-wrap: balance; }
  :lang(ko) :is(h1, h2, h3) { word-break: keep-all; }
  :lang(ja) :is(h1, h2, h3), :lang(zh-Hans) :is(h1, h2, h3) { word-break: auto-phrase; }
  :lang(en) .hero-stage h1 { font-size: clamp(1.9rem, 0.5rem + 2.7vw, 2.9rem); }
  @media (min-width: 420px) { .hero-stage h1 .hl-grad { white-space: nowrap; } }
  :lang(ja) .hero-stage h1 { font-size: clamp(1.9rem, 1.2rem + 2.2vw, 2.9rem); }
  .dl-cheat-card h3 { flex-wrap: wrap; gap: 6px 10px; }
  .dl-cheat-card h3 > span:first-child, .dl-cheat-card h3 .sec-tag { white-space: nowrap; }