/* AI Translator — website marketing. Không dùng thư viện: CSS thuần, font tự host (Be Vietnam Pro, OFL).
   Màu thương hiệu lấy từ biểu tượng app (#4b9bf5 → #1a5cc0, thanh sóng #1d63c9). Sáng/tối theo hệ thống, có nút đổi. */

@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 400; font-display: swap;
  src: url(/assets/fonts/be-vietnam-pro-400-vietnamese.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(/assets/fonts/be-vietnam-pro-400-latin.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(/assets/fonts/be-vietnam-pro-600-vietnamese.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(/assets/fonts/be-vietnam-pro-600-latin.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(/assets/fonts/be-vietnam-pro-700-vietnamese.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(/assets/fonts/be-vietnam-pro-700-latin.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; }

/* ---------- Tokens ---------- */
:root {
  color-scheme: light dark;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --bg: #fbfcfe;
  --bg-alt: #f1f5fb;
  --surface: #ffffff;
  --surface-2: #f6f9fe;
  --ink: #0b1322;
  --ink-2: #33405a;
  --ink-3: #566178;
  --line: #dfe7f2;
  --line-strong: #c6d3e6;
  --brand: #1d63c9;
  --brand-hover: #174fa3;
  --brand-ink: #0f4aa3;
  --brand-soft: #e7f0ff;
  --brand-glow: rgba(46, 125, 235, 0.16);
  --accent: #0a8f83;
  --accent-soft: #dcf5f1;
  --warn: #8a5a00;
  --warn-soft: #fff4d9;
  --ok: #0c7a4b;
  --on-brand: #ffffff;
  --shadow-sm: 0 1px 2px rgba(11, 19, 34, .06), 0 1px 1px rgba(11, 19, 34, .04);
  --shadow-md: 0 8px 24px -8px rgba(11, 19, 34, .14), 0 2px 6px rgba(11, 19, 34, .05);
  --shadow-lg: 0 30px 70px -24px rgba(16, 52, 120, .35), 0 8px 24px -12px rgba(11, 19, 34, .18);

  --r-sm: 8px; --r-md: 14px; --r-lg: 22px; --r-xl: 30px;
  --maxw: 1180px; --prose: 740px;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 68px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}
:root[data-theme="dark"] {
  --bg: #080d18; --bg-alt: #0c1322; --surface: #111a2d; --surface-2: #152036;
  --ink: #eef3fb; --ink-2: #c3cde0; --ink-3: #98a5bf; --line: #1f2c47; --line-strong: #2b3b5c;
  --brand: #4d9bff; --brand-hover: #74b0ff; --brand-ink: #8fc0ff; --brand-soft: #12274a; --brand-glow: rgba(77, 155, 255, .20);
  --accent: #2fd0c0; --accent-soft: #0e2b2b; --warn: #f2c15a; --warn-soft: #2a2110; --ok: #4fd69b; --on-brand: #04122b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4); --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, .6);
  --shadow-lg: 0 30px 80px -24px rgba(0, 0, 0, .75), 0 0 0 1px rgba(255, 255, 255, .04);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #080d18; --bg-alt: #0c1322; --surface: #111a2d; --surface-2: #152036;
    --ink: #eef3fb; --ink-2: #c3cde0; --ink-3: #98a5bf; --line: #1f2c47; --line-strong: #2b3b5c;
    --brand: #4d9bff; --brand-hover: #74b0ff; --brand-ink: #8fc0ff; --brand-soft: #12274a; --brand-glow: rgba(77, 155, 255, .20);
    --accent: #2fd0c0; --accent-soft: #0e2b2b; --warn: #f2c15a; --warn-soft: #2a2110; --ok: #4fd69b; --on-brand: #04122b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4); --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, .6);
    --shadow-lg: 0 30px 80px -24px rgba(0, 0, 0, .75), 0 0 0 1px rgba(255, 255, 255, .04);
  }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body { margin: 0; font-family: var(--font); font-size: 1.0625rem; line-height: 1.65; color: var(--ink-2); background: var(--bg);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: clip; }
img, svg, video { max-width: 100%; display: block; }
img { height: auto; }
h1, h2, h3, h4 { color: var(--ink); font-weight: 700; line-height: 1.18; letter-spacing: -0.02em; margin: 0 0 .5em; text-wrap: balance; }
h1 { font-size: clamp(2.05rem, 1.1rem + 3.4vw, 3.45rem); letter-spacing: -0.03em; line-height: 1.08; }
h2 { font-size: clamp(1.7rem, 1.1rem + 2vw, 2.55rem); letter-spacing: -0.025em; }
h3 { font-size: clamp(1.15rem, 1rem + .6vw, 1.4rem); letter-spacing: -0.015em; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1em; text-wrap: pretty; }
a { color: var(--brand-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--brand-hover); }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--brand); color: var(--on-brand); }
strong { color: var(--ink); font-weight: 600; }
code, kbd { font-family: var(--mono); font-size: .88em; }
code { background: var(--surface-2); border: 1px solid var(--line); padding: .1em .4em; border-radius: 6px; color: var(--ink); }
pre { margin: 1.2em 0; padding: 14px 18px; overflow-x: auto; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-md); font-size: .92rem; line-height: 1.55; }
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--brand); color: var(--on-brand); padding: 10px 16px; border-radius: var(--r-sm); font-weight: 600; text-decoration: none; }
.skip:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.icon { width: 1.25em; height: 1.25em; flex: none; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: calc(var(--maxw) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.narrow { max-width: calc(var(--prose) + var(--gutter) * 2); }
.section { padding-block: clamp(56px, 8vw, 112px); }
.section-tight { padding-block: clamp(36px, 5vw, 64px); }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: clamp(28px, 4vw, 52px); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p { font-size: 1.15rem; color: var(--ink-3); margin-bottom: 0; }
.eyebrow { display: inline-flex; align-items: center; gap: .5em; font-size: .8rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--brand-ink); margin-bottom: 1rem; }
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; border-radius: 2px; opacity: .7; }
.center .eyebrow { justify-content: center; }
.lead { font-size: clamp(1.1rem, 1rem + .5vw, 1.32rem); line-height: 1.6; color: var(--ink-2); }
.muted { color: var(--ink-3); }
.small { font-size: .9rem; }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.stack-lg { display: flex; flex-direction: column; gap: 1.75rem; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.row.center { justify-content: center; }
.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.split { display: grid; gap: clamp(28px, 5vw, 72px); align-items: center; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) {
  .split { grid-template-columns: 1fr 1fr; }
  .split.reverse > :first-child { order: 2; }
  /* wide-left: phần tử ĐẦU rộng hơn; wide-right: phần tử THỨ HAI rộng hơn (kể cả khi reverse đổi chỗ hiển thị). */
  .split.wide-left { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); }
  .split.wide-right { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }
  .split.wide-left.reverse { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }
  .split.wide-right.reverse { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); }
}

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; height: var(--header-h); border-bottom: 1px solid var(--line); }
/* Nền mờ đặt ở ::before: backdrop-filter trên chính header sẽ biến nó thành "khối chứa" của menu di động (position: fixed). */
.site-header::before { content: ""; position: absolute; inset: 0; z-index: -1; background: color-mix(in srgb, var(--bg) 84%, transparent); backdrop-filter: saturate(1.6) blur(14px); -webkit-backdrop-filter: saturate(1.6) blur(14px); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 100%; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.12rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand:hover { color: var(--ink); }
.nav { display: none; align-items: center; gap: 4px; }
.nav a, .nav summary { display: inline-flex; align-items: center; gap: 6px; padding: 9px 13px; border-radius: 999px; color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: .96rem; cursor: pointer; list-style: none; }
.nav a:hover, .nav summary:hover, .nav a[aria-current="page"] { background: var(--brand-soft); color: var(--brand-ink); }
.nav summary::-webkit-details-marker { display: none; }
.nav details { position: relative; }
.nav details[open] summary { background: var(--brand-soft); color: var(--brand-ink); }
.menu-pop { position: absolute; top: calc(100% + 8px); left: 0; min-width: 300px; padding: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); box-shadow: var(--shadow-md); display: grid; gap: 2px; }
.menu-pop a { display: block; border-radius: var(--r-sm); padding: 10px 12px; }
.menu-pop a span { display: block; font-size: .85rem; color: var(--ink-3); font-weight: 400; }
.header-tools { display: flex; align-items: center; gap: 8px; }
.lang-switch { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 999px; overflow: hidden; font-size: .85rem; font-weight: 600; }
.lang-switch a, .lang-switch span { padding: 6px 11px; text-decoration: none; color: var(--ink-3); }
.lang-switch [aria-current="true"] { background: var(--brand); color: var(--on-brand); }
.lang-switch a:hover { background: var(--brand-soft); color: var(--brand-ink); }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.icon-btn:hover { background: var(--brand-soft); color: var(--brand-ink); }
.mnav summary { list-style: none; }
.mnav summary::-webkit-details-marker { display: none; }
.nav-toggle { display: inline-grid; cursor: pointer; }
.mobile-nav { position: fixed; inset: var(--header-h) 0 0 0; z-index: 49; background: var(--bg); overflow-y: auto; padding: 16px var(--gutter) 40px; }
.mobile-nav a { display: block; padding: 14px 4px; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; font-weight: 600; font-size: 1.08rem; }
.mobile-nav .sub a { padding-left: 18px; font-weight: 500; color: var(--ink-2); font-size: 1rem; }
.mobile-nav .btn { margin-top: 20px; width: 100%; }
@media (min-width: 980px) { .nav { display: flex; } .mnav { display: none !important; } }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.site-footer .about p { max-width: 34em; margin-top: 14px; }
.site-footer .about p + p { margin-top: 0; }
.site-header .header-cta { display: none; }
@media (min-width: 640px) { .site-header .header-cta { display: inline-flex; } }

/* ---------- Buttons & chips ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 46px; padding: 11px 22px; border-radius: 999px; border: 1px solid transparent; font: inherit; font-weight: 600; font-size: 1rem; text-decoration: none; cursor: pointer; transition: transform .15s var(--ease), background .15s, box-shadow .2s, border-color .15s; line-height: 1.2; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: var(--on-brand); box-shadow: 0 6px 18px -6px var(--brand-glow), inset 0 1px 0 rgba(255,255,255,.18); }
.btn-primary:hover { background: var(--brand-hover); color: var(--on-brand); box-shadow: 0 10px 26px -8px var(--brand-glow); transform: translateY(-1px); }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--brand); color: var(--brand-ink); background: var(--brand-soft); }
.btn-ghost { color: var(--brand-ink); padding-inline: 8px; }
.btn-ghost:hover { background: var(--brand-soft); }
.btn-lg { min-height: 54px; padding: 14px 28px; font-size: 1.06rem; }
.btn-sm { min-height: 40px; padding: 8px 16px; font-size: .94rem; }
.pill { display: inline-flex; align-items: center; gap: 7px; padding: 6px 13px; border-radius: 999px; background: var(--brand-soft); color: var(--brand-ink); font-size: .86rem; font-weight: 600; border: 1px solid color-mix(in srgb, var(--brand) 22%, transparent); }
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent); }
.pill-plain { background: var(--surface); color: var(--ink-2); border-color: var(--line-strong); }
.badge { display: inline-block; padding: 2px 9px; border-radius: 6px; font-size: .72rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; background: var(--accent-soft); color: var(--accent); }
.badge-pro { background: var(--brand-soft); color: var(--brand-ink); }
.badge-soon { background: var(--warn-soft); color: var(--warn); }
kbd { display: inline-block; min-width: 1.9em; padding: .18em .5em; text-align: center; border-radius: 7px; border: 1px solid var(--line-strong); border-bottom-width: 2px; background: var(--surface); color: var(--ink); font-weight: 500; box-shadow: var(--shadow-sm); }
.keys { display: inline-flex; gap: 5px; align-items: center; flex-wrap: wrap; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: clamp(40px, 7vw, 96px) clamp(48px, 7vw, 100px); isolation: isolate; }
.hero::before { content: ""; position: absolute; inset: -20% -10% auto -10%; height: 90%; z-index: -1;
  background: radial-gradient(600px 360px at 18% 18%, var(--brand-glow), transparent 70%), radial-gradient(520px 320px at 86% 8%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%), radial-gradient(700px 400px at 60% 60%, color-mix(in srgb, var(--brand) 8%, transparent), transparent 70%); }
.hero-grid { display: grid; gap: clamp(32px, 5vw, 64px); align-items: center; }
@media (min-width: 1000px) { .hero-grid { grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr); } }
.hero h1 { margin-bottom: .45em; }
.hero h1 em { font-style: normal; background: linear-gradient(100deg, var(--brand) 0%, var(--accent) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { max-width: 34em; margin-bottom: 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 1.4rem; }
.trust { display: flex; flex-wrap: wrap; gap: 8px 18px; padding: 0; margin: 0; list-style: none; font-size: .93rem; color: var(--ink-3); }
.trust li { display: inline-flex; align-items: center; gap: 7px; }
.trust .icon { color: var(--ok); width: 1.1em; height: 1.1em; }
.page-hero { padding-block: clamp(40px, 6vw, 84px) clamp(28px, 4vw, 48px); border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--bg-alt), var(--bg)); }
.page-hero h1 { font-size: clamp(2rem, 1.2rem + 3vw, 3.2rem); max-width: 18em; }
.page-hero .lead { max-width: 42em; margin-bottom: 0; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 0 0 1.2rem; font-size: .9rem; color: var(--ink-3); }
.breadcrumb li + li::before { content: "/"; margin-right: 6px; opacity: .5; }
.breadcrumb a { color: var(--ink-3); text-decoration: none; }
.breadcrumb a:hover { color: var(--brand-ink); text-decoration: underline; }

/* ---------- Demo (minh họa cuộc họp có phụ đề dịch) ---------- */
.demo { position: relative; border-radius: var(--r-xl); background: linear-gradient(160deg, #14213d 0%, #0b1426 100%); border: 1px solid rgba(255,255,255,.08); box-shadow: var(--shadow-lg); overflow: hidden; color: #e8eefb; }
.demo-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(255,255,255,.04); border-bottom: 1px solid rgba(255,255,255,.07); font-size: .8rem; color: #9fb0cf; }
.demo-bar i { width: 10px; height: 10px; border-radius: 50%; background: #ff6159; box-shadow: 18px 0 0 #ffbd2e, 36px 0 0 #28c940; margin-right: 38px; }
.demo-bar .rec { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; }
.demo-bar .rec::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #ff5a5f; animation: pulse 1.6s ease-in-out infinite; }
.demo-stage { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px 14px 128px; min-height: 380px; }
.tile { position: relative; border-radius: 14px; background: linear-gradient(160deg, var(--t1, #1c2b4d), var(--t2, #121c35)); overflow: hidden; min-height: 126px; }
.tile::after { content: attr(data-name); position: absolute; left: 10px; bottom: 8px; z-index: 2; font-size: .74rem; padding: 3px 9px; border-radius: 999px; background: rgba(0,0,0,.5); color: #dbe5fa; }
.tile .avatar { position: absolute; left: 50%; bottom: 0; width: 56%; height: 82%; transform: translateX(-50%); }
.tile .avatar::before { content: ""; position: absolute; left: 50%; top: 4%; width: 40%; aspect-ratio: 1; transform: translateX(-50%); border-radius: 50%; background: radial-gradient(circle at 35% 30%, var(--c1), var(--c2)); box-shadow: 0 6px 18px -6px rgba(0,0,0,.5); }
.tile .avatar::after { content: ""; position: absolute; left: 50%; bottom: 0; width: 100%; height: 46%; transform: translateX(-50%); border-radius: 50% 50% 0 0 / 80% 80% 0 0; background: linear-gradient(180deg, var(--c2), color-mix(in srgb, var(--c2) 55%, #000)); }
.av1 { --t1: #1d3566; --t2: #0e1b3b; --c1: #8dbcff; --c2: #3f78e6; }
.av2 { --t1: #124b4a; --t2: #0a2a2c; --c1: #7ff0dd; --c2: #14a396; }
.av3 { --t1: #4a1d43; --t2: #260f27; --c1: #fbb6dc; --c2: #d03a8a; }
.av4 { --t1: #4d3510; --t2: #2a1c08; --c1: #fde08a; --c2: #d98a14; }
.tile.speaking { box-shadow: inset 0 0 0 2px #4ade80; }
.subtitle-bar { position: absolute; left: 4%; right: 4%; bottom: 16px; padding: 14px 18px 15px; border-radius: 16px; background: rgba(8, 13, 26, .86); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border: 1px solid rgba(255,255,255,.12); box-shadow: 0 18px 40px -12px rgba(0,0,0,.6); min-height: 92px; }
.subtitle-bar .lang { position: absolute; top: -13px; left: 16px; display: inline-flex; gap: 6px; align-items: center; padding: 3px 11px; border-radius: 999px; font-size: .72rem; font-weight: 700; letter-spacing: .05em; background: var(--brand); color: #fff; }
.subtitle-bar .pair { position: absolute; inset: 14px 18px 15px; opacity: 0; animation: line 12s infinite; }
.subtitle-bar .pair:nth-of-type(2) { animation-delay: 4s; }
.subtitle-bar .pair:nth-of-type(3) { animation-delay: 8s; }
.subtitle-bar .src { display: block; font-size: .8rem; color: #8ea2c7; margin-bottom: 4px; line-height: 1.4; }
.subtitle-bar .dst { display: block; font-size: clamp(1rem, .9rem + .5vw, 1.2rem); font-weight: 600; color: #fff; line-height: 1.35; letter-spacing: -.01em; }
.demo-note { position: absolute; right: 14px; top: 52px; font-size: .7rem; color: #7f93b8; }
@keyframes line { 0% { opacity: 0; transform: translateY(8px); } 6%, 30% { opacity: 1; transform: none; } 36%, 100% { opacity: 0; transform: translateY(-6px); } }
@keyframes pulse { 50% { opacity: .35; } }
.floaty { position: absolute; z-index: 2; display: inline-flex; gap: 8px; align-items: center; padding: 8px 14px; border-radius: 999px; background: var(--surface); color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow-md); font-size: .85rem; font-weight: 600; }
.floaty .icon { color: var(--brand); }
.demo-wrap { position: relative; }
.demo-wrap { padding-top: 30px; }
.demo-wrap .floaty.a { left: 26px; top: 0; } .demo-wrap .floaty.b { right: 26px; bottom: -18px; }
@media (max-width: 700px) { .demo-wrap .floaty { display: none; } .demo-stage { grid-template-columns: 1fr 1fr; padding-bottom: 130px; } }

.more-link { margin-top: 18px; }

/* ---------- Cards & features ---------- */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(20px, 2.4vw, 30px); box-shadow: var(--shadow-sm); }
.card h3 { margin-bottom: .4em; }
.card p:last-child { margin-bottom: 0; }
.card-link { display: block; text-decoration: none; color: inherit; transition: transform .2s var(--ease), box-shadow .2s, border-color .2s; }
.card-link:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--line-strong); color: inherit; }
.card-link .more { display: inline-flex; gap: 6px; align-items: center; color: var(--brand-ink); font-weight: 600; margin-top: .5rem; }
.card-link:hover .more .icon { transform: translateX(3px); }
.card-link .more .icon { transition: transform .2s var(--ease); }
.card-title { display: block; font-size: 1.15rem; font-weight: 700; color: var(--ink); letter-spacing: -.015em; line-height: 1.25; margin-bottom: .35em; }
.feature .ico { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; background: var(--brand-soft); color: var(--brand); margin-bottom: 1rem; }
.feature .ico .icon { width: 24px; height: 24px; }
.feature p { color: var(--ink-3); }
.feature.accent .ico { background: var(--accent-soft); color: var(--accent); }
.bento { display: grid; gap: clamp(14px, 1.8vw, 22px); grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); }
@media (min-width: 900px) { .bento { grid-template-columns: repeat(6, 1fr); } .bento > .span-2 { grid-column: span 2; } .bento > .span-3 { grid-column: span 3; } .bento > .span-4 { grid-column: span 4; } }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: clamp(16px, 3vw, 32px); margin-top: clamp(32px, 5vw, 56px); padding: clamp(22px, 3vw, 40px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-xl); box-shadow: var(--shadow-sm); }
.center-text { text-align: center; margin-top: 28px; }
.stat { text-align: center; padding: 8px; }
.stat span { display: block; margin-top: 8px; line-height: 1.45; }
.stat b { display: block; font-size: clamp(2rem, 1.4rem + 2vw, 3rem); color: var(--ink); letter-spacing: -.03em; line-height: 1.1; font-weight: 700; }
.stat span { color: var(--ink-3); font-size: .95rem; }

/* ---------- Steps ---------- */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; gap: clamp(14px, 2vw, 22px); grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.steps > li { counter-increment: step; position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 70px 24px 24px; box-shadow: var(--shadow-sm); }
.steps > li::before { content: counter(step); position: absolute; left: 24px; top: 20px; width: 38px; height: 38px; border-radius: 12px; display: grid; place-items: center; background: var(--brand); color: var(--on-brand); font-weight: 700; font-size: 1.05rem; }
.steps h3 { margin-bottom: .35em; font-size: 1.15rem; }
.steps p { margin: 0; color: var(--ink-3); }
.steps.vertical { grid-template-columns: 1fr; gap: 14px; }
.steps.vertical > li { padding: 22px 22px 22px 84px; }
.steps.vertical > li::before { top: 22px; left: 22px; }

/* ---------- Lists ---------- */
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .65rem; }
.check-list li { position: relative; padding-left: 30px; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .3em; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a8f83' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center/12px no-repeat; }
.check-list.no li::before { background-color: var(--warn-soft); background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a5a00' stroke-width='3' stroke-linecap='round'%3E%3Cpath d='M7 7l10 10M17 7L7 17'/%3E%3C/svg%3E"); }

/* ---------- Pricing ---------- */
.plans { display: grid; gap: clamp(16px, 2vw, 26px); grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-xl); padding: clamp(24px, 2.6vw, 34px); box-shadow: var(--shadow-sm); }
.plan.featured { border: 2px solid var(--brand); box-shadow: var(--shadow-lg); background: linear-gradient(180deg, var(--brand-soft), var(--surface) 38%); }
.plan .tag { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--brand); color: var(--on-brand); font-size: .76rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 5px 14px; border-radius: 999px; white-space: nowrap; }
.plan h3 { font-size: 1.3rem; margin-bottom: .2em; }
.plan .for { color: var(--ink-3); font-size: .95rem; min-height: 3em; }
.price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px; margin: .6rem 0 .3rem; }
.price b { font-size: clamp(2.2rem, 1.6rem + 2vw, 3rem); color: var(--ink); letter-spacing: -.03em; line-height: 1; }
.price span { color: var(--ink-3); }
.plan .per { font-size: .9rem; color: var(--ink-3); margin-bottom: 1.2rem; }
.plan .check-list { margin-bottom: 1.6rem; flex: 1; }
.plan .btn { width: 100%; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); margin: 1.2rem 0; }
table { border-collapse: collapse; width: 100%; font-size: .96rem; }
th, td { padding: 13px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
thead th { background: var(--surface-2); color: var(--ink); font-weight: 600; white-space: nowrap; }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 0; }
tbody th { font-weight: 600; color: var(--ink); background: transparent; }
td .yes { color: var(--ok); font-weight: 700; } td .no { color: var(--ink-3); }
.compare th:first-child, .compare td:first-child { position: sticky; left: 0; background: var(--surface); }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 10px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); transition: border-color .2s, box-shadow .2s; }
.faq details[open] { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 22px; font-weight: 600; color: var(--ink); font-size: 1.04rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--brand-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231d63c9' stroke-width='2.6' stroke-linecap='round'%3E%3Cpath d='M12 6v12M6 12h12'/%3E%3C/svg%3E") center/12px no-repeat; transition: transform .25s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .answer { padding: 0 22px 20px; color: var(--ink-2); }
.faq .answer > :last-child { margin-bottom: 0; }

/* ---------- Callouts ---------- */
.callout { display: flex; gap: 14px; padding: 18px 20px; border-radius: var(--r-md); background: var(--brand-soft); border: 1px solid color-mix(in srgb, var(--brand) 25%, transparent); color: var(--ink-2); margin: 1.4rem 0; }
.callout > .icon { color: var(--brand); margin-top: .2em; width: 1.4em; height: 1.4em; }
.callout > div > :last-child { margin-bottom: 0; }
.callout strong { color: var(--ink); }
.callout.warn { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.callout.warn > .icon { color: var(--warn); }
.callout.ok { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.callout.ok > .icon { color: var(--accent); }

/* ---------- Dải tối: nhấn mạnh dữ liệu ở lại trên máy ---------- */
.band-dark { position: relative; isolation: isolate; overflow: hidden; background: linear-gradient(160deg, #0c1a38 0%, #0a1226 60%, #08101f 100%); color: #c9d6ee; border-block: 1px solid rgba(255,255,255,.06); }
.band-dark::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(520px 280px at 88% 0%, rgba(77,155,255,.24), transparent 70%), radial-gradient(480px 260px at 4% 100%, rgba(47,208,192,.15), transparent 70%); }
.band-dark h2, .band-dark h3 { color: #fff; }
.band-dark .eyebrow { color: #8fc0ff; }
.band-dark .section-head p { color: #adbcd9; }
.band-dark .card { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.1); box-shadow: none; }
.band-dark .feature p { color: #adbcd9; }
.band-dark .feature .ico { background: rgba(77,155,255,.16); color: #8fc0ff; }
.band-dark .feature.accent .ico { background: rgba(47,208,192,.18); color: #7ff0dd; }
.band-dark a:not(.btn) { color: #8fc0ff; }
.band-dark .btn-secondary { background: rgba(255,255,255,.06); color: #fff; border-color: rgba(255,255,255,.28); }
.band-dark .btn-secondary:hover { background: rgba(255,255,255,.14); color: #fff; border-color: #fff; }
.dataflow { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); margin-bottom: clamp(28px, 4vw, 44px); }
@media (min-width: 920px) { .dataflow { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); } }
.lane { border-radius: var(--r-lg); padding: 22px 24px 24px; border: 1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.04); }
.lane .tag { display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; padding: 4px 11px; border-radius: 999px; margin-bottom: 14px; }
.lane-cloud .tag { background: rgba(245,158,11,.16); color: #fbbf6b; }
.lane-local { border-color: rgba(47,208,192,.55); background: linear-gradient(160deg, rgba(47,208,192,.16), rgba(77,155,255,.08)); box-shadow: 0 0 0 1px rgba(47,208,192,.14), 0 24px 56px -24px rgba(47,208,192,.4); }
.lane-local .tag { background: rgba(47,208,192,.22); color: #7ff0dd; }
.nodes { list-style: none; margin: 0 0 14px; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 6px; align-items: center; }
.nodes li { padding: 7px 10px; border-radius: 10px; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.1); font-size: .9rem; line-height: 1.3; color: #e6eefc; font-weight: 600; }
.nodes li small { display: block; font-weight: 400; color: #9db0d3; font-size: .78rem; }
.nodes li.net { background: none; border: 1px dashed rgba(251,191,107,.55); color: #fbbf6b; }
.nodes li.ai { background: rgba(47,208,192,.2); border-color: rgba(47,208,192,.6); }
.nodes li.sep { background: none; border: 0; padding: 0 1px; color: #7d90b5; font-weight: 700; }
@media (max-width: 919px) { .nodes { flex-direction: column; align-items: flex-start; gap: 4px; } .nodes li.sep { transform: rotate(90deg); width: 16px; height: 16px; line-height: 16px; text-align: center; padding: 0; margin-left: 18px; } }
@media (min-width: 920px) { .nodes { flex-wrap: nowrap; gap: 4px; } .nodes li { font-size: .84rem; } .nodes li small { font-size: .72rem; } }
.lane > p { margin: 0; font-size: .94rem; color: #b8c6e0; }
.lane-local > p { color: #d3f6f0; }

/* ---------- CTA band ---------- */
.cta-band { position: relative; overflow: hidden; border-radius: var(--r-xl); padding: clamp(32px, 5vw, 64px); background: linear-gradient(135deg, #123b86 0%, #1d63c9 55%, #2a86e8 100%); color: #eaf2ff; text-align: center; isolation: isolate; }
.cta-band::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(500px 260px at 85% 0%, rgba(255,255,255,.2), transparent 70%), radial-gradient(420px 240px at 10% 100%, rgba(10,200,190,.25), transparent 70%); }
.cta-band h2 { color: #fff; max-width: 18em; margin-inline: auto; }
.cta-band p { color: #d3e3ff; max-width: 36em; margin-inline: auto; font-size: 1.12rem; }
.cta-band .row { justify-content: center; margin-top: 1.4rem; }
.cta-band .btn-primary { background: #fff; color: #0f3d8f; box-shadow: 0 10px 30px -10px rgba(0,0,0,.4); }
.cta-band .btn-primary:hover { background: #eaf2ff; color: #0b2f72; }
.cta-band .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.cta-band .btn-secondary:hover { background: rgba(255,255,255,.14); color: #fff; border-color: #fff; }

/* ---------- Prose (bài hướng dẫn, pháp lý) ---------- */
.prose { font-size: 1.08rem; }
.prose > * + * { margin-top: 1.1em; }
.prose > h2:first-child { margin-top: 0; }
.prose h2 { margin-top: 2.4em; padding-top: .2em; font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); }
.prose h3 { margin-top: 1.9em; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: .4em; }
.prose li::marker { color: var(--brand); }
.prose img { border-radius: var(--r-md); border: 1px solid var(--line); }
.prose blockquote { margin: 1.4em 0; padding: .2em 1.2em; border-left: 3px solid var(--brand); color: var(--ink-2); background: var(--surface-2); border-radius: 0 var(--r-sm) var(--r-sm) 0; }
.prose .table-wrap { margin: 1.4em 0; }
.legal h2 { font-size: 1.4rem; }
.doc-layout { display: grid; gap: 40px; align-items: start; grid-template-columns: minmax(0, 1fr); }
.doc-layout > * { min-width: 0; }
@media (min-width: 1060px) { .doc-layout { grid-template-columns: 250px minmax(0, 1fr); } .doc-layout.no-toc { grid-template-columns: minmax(0, 1fr); } }
.toc { position: sticky; top: calc(var(--header-h) + 24px); font-size: .93rem; border-left: 2px solid var(--line); padding-left: 16px; max-height: calc(100vh - var(--header-h) - 48px); overflow: auto; }
.toc b { display: block; color: var(--ink); margin-bottom: 8px; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; }
.toc a { display: block; padding: 5px 0; color: var(--ink-3); text-decoration: none; line-height: 1.4; }
.toc a:hover { color: var(--brand-ink); }
.toc .l3 { padding-left: 12px; font-size: .88rem; }
@media (max-width: 1059px) { .toc { position: static; border: 1px solid var(--line); border-radius: var(--r-md); padding: 14px 18px; background: var(--surface); max-height: none; } }
.doc-nav { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); margin-top: 3rem; }
.doc-nav a { display: block; padding: 16px 20px; border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); text-decoration: none; color: var(--ink); font-weight: 600; }
.doc-nav a span { display: block; font-size: .8rem; font-weight: 500; color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }
.doc-nav a:hover { border-color: var(--brand); }
.meta-line { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--ink-3); font-size: .9rem; margin-top: 1.2rem; }

/* ---------- Device frame (ảnh chụp giao diện app) ---------- */
.shot { position: relative; margin: 0; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line-strong); box-shadow: var(--shadow-lg); background: var(--surface); }
.shot img { width: 100%; }
.shot figcaption { padding: 12px 18px; font-size: .88rem; color: var(--ink-3); border-top: 1px solid var(--line); background: var(--surface); }
.shot.plain { box-shadow: var(--shadow-md); }
.shot.window .bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: var(--surface-2); border-bottom: 1px solid var(--line); font-size: .78rem; color: var(--ink-3); }
.shot.window .bar i { width: 10px; height: 10px; border-radius: 50%; background: #ff6159; box-shadow: 16px 0 0 #ffbd2e, 32px 0 0 #28c940; margin-right: 38px; }
.shot.window .bar span { margin-inline: auto; padding-right: 66px; font-weight: 600; letter-spacing: .01em; }
.shot.stage { background: transparent; border: 0; box-shadow: none; }
.shot.stage .backdrop { border-radius: var(--r-lg); padding: clamp(24px, 5vw, 52px) clamp(12px, 2.4vw, 28px); background: radial-gradient(600px 240px at 20% 0%, rgba(77,155,255,.28), transparent 70%), linear-gradient(160deg, #16264a, #0a1428); border: 1px solid rgba(255,255,255,.08); box-shadow: var(--shadow-md); }
.shot.stage .backdrop img { width: 100%; margin-inline: auto; }
.shot.stage figcaption { background: transparent; border: 0; padding-inline: 4px; }
.facts { display: grid; gap: 0; margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.split + .facts, .table-wrap + .facts, .grid + .facts { margin-top: clamp(28px, 4vw, 48px); }
.facts > div { padding: 16px 20px; box-shadow: inset 0 0 0 .5px var(--line); }
.facts dt { font-size: .78rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--brand-ink); margin-bottom: 4px; }
.facts dd { margin: 0; color: var(--ink); font-weight: 500; line-height: 1.5; }
.facts dd small { display: block; color: var(--ink-3); font-weight: 400; }

/* ---------- Chips, app strip ---------- */
.app-strip { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 0; padding: 0; list-style: none; }
.app-strip li { padding: 10px 18px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); color: var(--ink-2); font-weight: 600; font-size: .95rem; }
.disclaimer { font-size: .82rem; color: var(--ink-3); text-align: center; margin-top: 14px; }

/* ---------- Footer ---------- */
.site-footer { margin-top: clamp(56px, 8vw, 110px); background: var(--bg-alt); border-top: 1px solid var(--line); padding-block: clamp(40px, 6vw, 72px) 28px; font-size: .96rem; }
.footer-grid { display: grid; gap: 32px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr)); }
.footer-grid .about { grid-column: span 2; min-width: min(100%, 280px); }
@media (max-width: 560px) { .footer-grid .about { grid-column: 1 / -1; } }
.footer-title { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--ink); margin: 0 0 .9rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--brand-ink); text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: .86rem; }

/* ---------- Scroll reveal (chỉ khi có JS) ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
/* Khối trên màn hình đầu hiện ngay, không chờ JS (tốt cho LCP). */
.js .hero .reveal, .js .page-hero .reveal { opacity: 1; transform: none; transition: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
  .subtitle-bar .pair:first-of-type { opacity: 1; }
}
@media print { .site-header, .site-footer, .cta-band, .nav-toggle, .skip { display: none !important; } body { background: #fff; color: #000; } a { color: #000; } }