/* Website PFamily — giao diện 2026-11.
   Màu lấy từ app (FTreeClient lib/theme.dart): đỏ son #5B1A1A, kem #F4F1EA, vàng #E7D3A1.
   Nền tối (hero, tiêu đề trang, dải tối, chân trang, chế độ tối của máy): chữ CHỈ trắng /
   vàng nhạt, không để màu link mặc định (luật của app).
   CSP của site là 'self': không style="" trong HTML; JS chỉ đổi biến CSS qua CSSOM.
   Hiệu ứng 3D/chuyển động tắt hết khi máy bật "giảm chuyển động". */

@font-face { font-family: "Be Vietnam Pro"; font-weight: 400; font-display: swap; src: url(../fonts/BeVietnamPro-Regular.woff2) format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-weight: 600; font-display: swap; src: url(../fonts/BeVietnamPro-SemiBold.woff2) format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-weight: 700; font-display: swap; src: url(../fonts/BeVietnamPro-Bold.woff2) format("woff2"); }
@font-face { font-family: "Playfair Display"; font-weight: 400 900; font-display: swap; src: url(../fonts/PlayfairDisplay.woff2) format("woff2"); }

:root {
  --lac: #5B1A1A;
  --lac-2: #7A2121;
  --lac-3: #8A1F1F;
  --lac-deep: #2A0B0A;
  --lac-ink: #160605;
  --gold: #E7D3A1;
  --gold-2: #F3D28A;
  --gold-3: #C9A866;
  --gold-deep: #9C7631;
  --cream: #F4F1EA;

  --page: #F7F2E8;
  --page-alt: #FFFBF3;
  --card: #FFFFFF;
  --ink: #2B2420;
  --muted: #6A5E54;
  --border: #EADFC9;
  --accent: var(--lac-3);
  --link: var(--lac-3);
  --ico-bg: linear-gradient(140deg, var(--lac-3), var(--lac-deep));
  --ico: var(--gold-2);
  --shadow-sm: 0 1px 2px rgba(91, 26, 26, .06), 0 6px 18px rgba(91, 26, 26, .06);
  --shadow: 0 30px 60px -28px rgba(60, 14, 12, .45);
  --grad-gold: linear-gradient(120deg, #FFE7AE 0%, #F3D28A 35%, #D4A64E 70%, #F6DB98 100%);
  --grad-lac: linear-gradient(160deg, #3A0E0C 0%, #5B1A1A 55%, #7A2121 100%);

  --serif: "Playfair Display", "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans: "Be Vietnam Pro", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;

  --r-sm: 10px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px;
  --wrap: 1180px;
  --gutter: 16px;
  --top-h: 68px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #140E0C;
    --page-alt: #1B1310;
    --card: #231A16;
    --ink: #FFFFFF;
    --muted: rgba(255, 255, 255, .74);
    --border: #3E302A;
    --accent: var(--gold-2);
    --link: var(--gold-2);
    --gold-deep: var(--gold);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow: 0 30px 60px -28px rgba(0, 0, 0, .8);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--top-h) + 12px); }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 400 17px/1.7 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { max-width: 100%; }
img { height: auto; display: block; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--gold-2); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1, h2 { font-family: var(--serif); font-weight: 700; font-variant-numeric: lining-nums; }
h2 { font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.7rem); }
h3 { font-size: 1.14rem; font-weight: 600; }
p { margin: 0 0 1em; }
b, strong { font-weight: 600; }
kbd { font: 600 .82em var(--sans); padding: 1px 7px; border-radius: 6px; border: 1px solid var(--border); border-bottom-width: 2px; background: var(--card); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--gold-2); color: var(--lac-ink); padding: 10px 16px; border-radius: 10px; font-weight: 600; }
.skip:focus { top: 12px; }
.wrap { width: min(var(--wrap), 100% - 2 * var(--gutter)); margin-inline: auto; }
.wrap.narrow { width: min(820px, 100% - 2 * var(--gutter)); }
.center { text-align: center; }
.ico { width: 26px; height: 26px; flex: none; }

/* ---------- nút ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; border: 1.5px solid transparent;
  font: 600 .98rem/1.2 var(--sans); text-decoration: none; cursor: pointer;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn .ico { width: 18px; height: 18px; }
.btn-primary { background: var(--grad-lac); color: #fff; box-shadow: 0 14px 30px -14px rgba(91, 26, 26, .9); }
.btn-gold { background: var(--grad-gold); color: var(--lac-ink); box-shadow: 0 14px 30px -14px rgba(184, 137, 58, .95); }
.btn-outline { border-color: var(--accent); color: var(--accent); background: transparent; }
.btn-outline:hover { background: var(--accent); color: var(--page); }
.btn-ghost-light { border-color: rgba(255, 255, 255, .45); color: #fff; background: rgba(255, 255, 255, .06); }
.btn-ghost-light:hover { background: rgba(255, 255, 255, .14); border-color: var(--gold-2); color: var(--gold-2); }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; text-decoration: none; }
.link-arrow .ico { width: 18px; height: 18px; transition: transform .2s; }
.link-arrow:hover .ico { transform: translateX(4px); }

/* ---------- thanh đầu trang ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50; height: var(--top-h);
  background: rgba(30, 8, 7, .55);
  -webkit-backdrop-filter: saturate(1.4) blur(16px); backdrop-filter: saturate(1.4) blur(16px);
  border-bottom: 1px solid rgba(243, 210, 138, .12);
  transition: background .3s, box-shadow .3s;
}
.topbar.scrolled { background: rgba(26, 7, 6, .92); box-shadow: 0 10px 30px -18px rgba(0, 0, 0, .8); }
.topbar-in { height: 100%; display: flex; align-items: center; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font: 700 1.35rem/1 var(--serif); letter-spacing: .01em; }
.brand img { width: 36px; height: 36px; filter: drop-shadow(0 4px 10px rgba(0, 0, 0, .35)); }
.nav { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 4px; }
.nav a { color: rgba(255, 255, 255, .86); text-decoration: none; font-size: .95rem; font-weight: 500; }
.nav > ul:first-child a { display: block; padding: 8px 12px; border-radius: 999px; transition: background .2s, color .2s; }
.nav > ul:first-child a:hover { color: var(--gold-2); background: rgba(255, 255, 255, .06); }
.nav a[aria-current="page"] { color: var(--gold-2); background: rgba(243, 210, 138, .1); }
.nav .langs { gap: 2px; padding: 3px; border: 1px solid rgba(255, 255, 255, .16); border-radius: 999px; }
.langs a { display: block; padding: 4px 10px; border-radius: 999px; font-size: .8rem; color: rgba(255, 255, 255, .75); text-decoration: none; }
.langs a[aria-current="true"] { background: var(--gold-2); color: var(--lac-ink); font-weight: 600; }
.nav-admin { padding: 9px 18px; font-size: .9rem; }
.menu-btn { display: none; margin-left: auto; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; border-radius: 12px; }
.menu-bars, .menu-bars::before, .menu-bars::after { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; margin: auto; position: relative; transition: transform .25s, background .25s; }
.menu-bars::before, .menu-bars::after { content: ""; position: absolute; left: 0; }
.menu-bars::before { top: -7px; } .menu-bars::after { top: 7px; }
.menu-open .menu-bars { background: transparent; }
.menu-open .menu-bars::before { transform: translateY(7px) rotate(45deg); }
.menu-open .menu-bars::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero trang chủ ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate; color: #fff;
  margin-top: calc(-1 * var(--top-h));
  padding: calc(var(--top-h) + clamp(40px, 7vw, 96px)) 0 clamp(150px, 20vw, 290px);
  background: linear-gradient(180deg, #1E0706 0%, #3D0F0D 30%, #6E1F1A 58%, #A8452A 82%, #D98A4E 100%);
}
.hero-sky { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.hero-sun { /* mặt trời lặn giữa chữ và cụm điện thoại: đĩa sáng, quầng, tia xoay chậm */
  position: absolute; left: 57%; top: 36%; width: clamp(220px, 26vw, 400px); aspect-ratio: 1; border-radius: 50%;
  translate: -50% -50%;
  background: radial-gradient(circle at 45% 40%, #FFFBEA 0%, #FFE9A8 30%, #FCC86A 58%, #F29A45 78%, #E2702F 100%);
  box-shadow: 0 0 40px 10px rgba(255, 214, 130, .75), 0 0 140px 60px rgba(252, 180, 90, .5), 0 0 320px 140px rgba(240, 140, 70, .32);
  animation: sun 7s ease-in-out infinite alternate;
}
.hero-sun::before { /* tia nắng */
  content: ""; position: absolute; inset: -95%; border-radius: 50%; z-index: -1;
  background: repeating-conic-gradient(from 0deg, rgba(255, 224, 150, .2) 0deg 5deg, rgba(255, 224, 150, 0) 5deg 15deg);
  -webkit-mask-image: radial-gradient(closest-side, #000 22%, transparent 100%); mask-image: radial-gradient(closest-side, #000 22%, transparent 100%);
  animation: rays 140s linear infinite;
}
.hero-sun::after { /* vầng sáng loé trên mặt đĩa */
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle at 38% 32%, rgba(255, 255, 255, .7), rgba(255, 255, 255, 0) 38%);
}
@keyframes sun { from { scale: 1; filter: brightness(.96); } to { scale: 1.05; filter: brightness(1.08); } }
@keyframes rays { to { rotate: 360deg; } }
.hero-clouds { position: absolute; left: 0; right: 0; top: 8%; height: 46%; background: url(../img/art/clouds.svg) repeat-x 0 0 / auto 100%; opacity: .55; animation: drift 120s linear infinite; }
@keyframes drift { to { background-position: -1600px 0; } }
.hero-layer { position: absolute; left: 0; right: 0; bottom: 0; height: 100%; width: 100%; object-fit: cover; object-position: 60% 100%; will-change: transform; }
.hero-far { transform: translate3d(calc(var(--px, 0) * -10px), calc(var(--sy, 0) * .15px), 0); }
.hero-near { transform: translate3d(calc(var(--px, 0) * -22px), calc(var(--sy, 0) * -.05px), 0); }
.embers span {
  position: absolute; bottom: -10px; width: 5px; height: 5px; border-radius: 50%;
  background: #FFD98A; box-shadow: 0 0 10px 3px rgba(255, 196, 107, .7); opacity: 0;
  animation: ember 9s linear infinite;
}
.embers span:nth-child(1) { left: 8%; animation-delay: 0s; }
.embers span:nth-child(2) { left: 18%; animation-delay: 2.4s; animation-duration: 11s; }
.embers span:nth-child(3) { left: 27%; animation-delay: 5s; }
.embers span:nth-child(4) { left: 39%; animation-delay: 1.2s; animation-duration: 12s; }
.embers span:nth-child(5) { left: 52%; animation-delay: 3.6s; }
.embers span:nth-child(6) { left: 63%; animation-delay: 6.5s; animation-duration: 10s; }
.embers span:nth-child(7) { left: 74%; animation-delay: .8s; }
.embers span:nth-child(8) { left: 83%; animation-delay: 4.4s; animation-duration: 13s; }
.embers span:nth-child(9) { left: 92%; animation-delay: 7.2s; }
.embers span:nth-child(10) { left: 46%; animation-delay: 8.1s; animation-duration: 14s; }
@keyframes ember {
  0% { transform: translate3d(0, 0, 0) scale(.6); opacity: 0; }
  10% { opacity: .9; }
  50% { transform: translate3d(24px, -45vh, 0) scale(1); }
  100% { transform: translate3d(-18px, -90vh, 0) scale(.4); opacity: 0; }
}

.hero-in { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(28px, 4vw, 64px); align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 22px;
  padding: 7px 16px 7px 8px; border-radius: 999px; font-size: .85rem; font-weight: 600; letter-spacing: .02em;
  color: var(--gold-2); background: rgba(255, 255, 255, .07); border: 1px solid rgba(243, 210, 138, .3);
}
.pill i { width: 22px; height: 22px; border-radius: 50%; background: var(--grad-gold); display: grid; place-items: center; }
.pill i::after { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--lac); }
.hero h1 { font-size: clamp(2.4rem, 1.3rem + 4.6vw, 4.6rem); line-height: 1.06; letter-spacing: -.02em; margin-bottom: .35em; text-wrap: balance; }
.gold-text, .hero h1 span, .cta h2 span, .page-head h1 span {
  background: var(--grad-gold); background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: shine 6s ease-in-out infinite alternate;
}
@keyframes shine { to { background-position: 100% 0; } }
.hero .lead { font-size: clamp(1.03rem, .95rem + .4vw, 1.2rem); color: rgba(255, 255, 255, .86); max-width: 56ch; margin-bottom: 28px; }
.hero-admin { margin: 18px 0 0; color: rgba(255, 255, 255, .8); font-size: .95rem; }
.hero-admin a { color: var(--gold-2); }
.trust { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 26px 0 0; padding: 0; list-style: none; font-size: .88rem; color: rgba(255, 255, 255, .78); }
.trust li { display: inline-flex; align-items: center; gap: 7px; }
.trust .ico { width: 17px; height: 17px; color: var(--gold-2); }

/* ---- điện thoại 3D ---- */
.stage { position: relative; perspective: 1600px; height: clamp(440px, 46vw, 600px); z-index: 1; }
.phones {
  position: absolute; inset: 0; transform-style: preserve-3d;
  transform: rotateX(calc(8deg + var(--py, 0) * -6deg)) rotateY(calc(-14deg + var(--px, 0) * 10deg));
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
}
.device {
  position: absolute; width: clamp(190px, 18.5vw, 260px); aspect-ratio: 1206 / 2622;
  border-radius: 38px; padding: 9px;
  background: linear-gradient(145deg, #4A1A16, #120404 60%, #2A0B0A);
  box-shadow: inset 0 0 0 1.5px rgba(243, 210, 138, .35), 0 40px 80px -30px rgba(0, 0, 0, .85);
  transform-style: preserve-3d;
}
.device img { width: 100%; height: 100%; object-fit: cover; border-radius: 30px; }
.device::after { /* ánh kính */
  content: ""; position: absolute; inset: 9px; border-radius: 30px; pointer-events: none;
  background: linear-gradient(115deg, rgba(255, 255, 255, .22) 0%, rgba(255, 255, 255, 0) 32%, rgba(255, 255, 255, 0) 70%, rgba(255, 255, 255, .08) 100%);
}
.device.d-front { left: 50%; top: 50%; translate: -50% -50%; transform: translateZ(90px); animation: float 7s ease-in-out infinite; z-index: 3; }
.device.d-left { left: 6%; top: 50%; translate: 0 -46%; transform: translateZ(-60px) rotateY(18deg); animation: float 8s ease-in-out -2s infinite; opacity: .96; }
.device.d-right { right: 4%; top: 50%; translate: 0 -54%; transform: translateZ(-30px) rotateY(-16deg); animation: float 9s ease-in-out -4s infinite; opacity: .96; }
@keyframes float { 50% { margin-top: -14px; } }
.chip3d {
  position: absolute; z-index: 4; display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 16px; color: #2B2420; font-size: .82rem; line-height: 1.3;
  background: rgba(255, 251, 243, .95); box-shadow: 0 20px 40px -18px rgba(0, 0, 0, .6);
  transform: translateZ(160px); white-space: nowrap;
}
.chip3d b { display: block; font-size: .92rem; color: var(--lac); }
.chip3d .ico { width: 34px; height: 34px; padding: 7px; border-radius: 10px; background: var(--ico-bg); color: var(--gold-2); }
.chip3d.c1 { left: -2%; top: 14%; animation: float 6s ease-in-out -1s infinite; }
.chip3d.c2 { right: -2%; bottom: 12%; animation: float 7s ease-in-out -3s infinite; }

.scroll-cue { position: absolute; left: 50%; bottom: 22px; translate: -50% 0; width: 26px; height: 42px; border: 2px solid rgba(255, 255, 255, .55); border-radius: 14px; z-index: 3; }
.scroll-cue::after { content: ""; position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: var(--gold-2); animation: cue 1.8s ease-in-out infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

/* ---------- kho ứng dụng ---------- */
.store-row { display: flex; flex-wrap: wrap; gap: 12px; }
.store {
  display: inline-flex; align-items: center; gap: 12px; min-width: 186px;
  padding: 10px 20px 10px 16px; border-radius: 16px; text-decoration: none;
  background: #0E0303; color: #fff; border: 1px solid rgba(243, 210, 138, .35);
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, .9); transition: transform .2s, border-color .2s;
}
a.store:hover { transform: translateY(-3px); border-color: var(--gold-2); }
.store-apk { background: linear-gradient(140deg, #1F3A1E, #0E1F0D); border-color: rgba(140, 210, 120, .45); }
.store-apk svg { color: #9BE07F; }
.store svg { width: 28px; height: 28px; }
.store span { display: flex; flex-direction: column; font: 600 1.12rem/1.15 var(--sans); }
.store small { font-size: .7rem; font-weight: 400; opacity: .8; }
.store.is-soon { opacity: .78; cursor: default; }
.store-note { margin: 12px 0 0; font-size: .86rem; opacity: .85; }
.apk-verify { margin-top: 14px; border: 1px solid var(--border); border-radius: var(--r-md); background: var(--card); font-size: .88rem; }
.apk-verify summary { cursor: pointer; padding: 10px 14px; font-weight: 600; }
.apk-verify > :not(summary) { padding: 0 14px; }
.apk-verify p { margin: 0 0 8px; color: var(--muted); }
.apk-verify dl { margin: 0; padding-bottom: 12px; }
.apk-verify dt { font-weight: 600; margin-top: 8px; }
.apk-verify dd { margin: 4px 0 0; }
.apk-verify code { display: block; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .78rem; overflow-wrap: anywhere; word-break: break-all; background: rgba(127, 127, 127, .12); padding: 6px 8px; border-radius: 6px; user-select: all; }
.apk-verify small { display: block; margin-top: 4px; color: var(--muted); }
.hero .store-note a, .cta .store-note a, .band-dark .store-note a { color: var(--gold-2); }

/* ---------- dải số liệu ---------- */
.stats { position: relative; z-index: 5; margin-top: clamp(-90px, -7vw, -60px); }
.stats-in {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-xl);
  box-shadow: var(--shadow); overflow: hidden;
}
.stat { padding: 26px 24px; position: relative; }
.stat + .stat::before { content: ""; position: absolute; left: 0; top: 22%; bottom: 22%; width: 1px; background: var(--border); }
.stat b { display: block; font: 700 clamp(1.9rem, 1.4rem + 1.6vw, 2.6rem)/1.1 var(--serif); color: var(--accent); white-space: nowrap; }
.stat span { display: block; margin-top: 6px; font-size: .9rem; color: var(--muted); line-height: 1.45; }

/* ---------- khối chung ---------- */
.section { padding: clamp(68px, 9vw, 120px) 0; position: relative; }
.section-alt { background: var(--page-alt); }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto clamp(36px, 5vw, 60px); }
.sec-head.left { text-align: left; margin-left: 0; }
.sec-head p:last-child { color: var(--muted); font-size: 1.06rem; margin-bottom: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; margin: 0 0 14px;
  font: 700 .78rem/1.3 var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--gold-deep);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; border-radius: 2px; background: currentColor; }
.sec-head:not(.left) .eyebrow::after { content: ""; width: 26px; height: 2px; border-radius: 2px; background: currentColor; }
.lead { font-size: 1.1rem; color: var(--muted); }

/* thẻ */
.cards { display: grid; gap: 22px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  position: relative; background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 28px; box-shadow: var(--shadow-sm); overflow: hidden;
  transition: box-shadow .3s, border-color .3s;
}
.card > .ico {
  width: 52px; height: 52px; padding: 13px; margin-bottom: 18px; border-radius: 15px;
  background: var(--ico-bg); color: var(--ico);
  box-shadow: 0 12px 24px -12px rgba(91, 26, 26, .9);
}
.card h3 { margin-bottom: .45em; }
.card p { color: var(--muted); margin: 0; font-size: .97rem; }
.card::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--grad-gold); opacity: 0; transition: opacity .3s; }
.card:hover { border-color: rgba(201, 168, 102, .6); box-shadow: var(--shadow); }
.card:hover::before { opacity: 1; }
.mini .card { padding: 20px; }
.mini .card > .ico { width: 44px; height: 44px; padding: 11px; margin-bottom: 12px; }
.contact-card { display: flex; flex-direction: column; align-items: flex-start; }
.contact-card .btn { margin-top: 20px; }
.contact-mail { margin-top: 32px; color: var(--muted); }

/* thẻ nghiêng 3D theo chuột (JS đặt --rx, --ry, --gx, --gy) */
.js .tilt { transform: perspective(900px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transition: transform .4s cubic-bezier(.2, .7, .2, 1), box-shadow .3s, border-color .3s, opacity .9s; }
.js .tilt.tilting { transition: transform .08s linear, box-shadow .3s, opacity .9s; }
.tilt::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .3s;
  background: radial-gradient(420px circle at var(--gx, 50%) var(--gy, 50%), rgba(243, 210, 138, .22), transparent 45%);
}
.tilt:hover::after { opacity: 1; }

/* danh sách dấu tích */
.ticks { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.ticks li { display: flex; gap: 12px; align-items: flex-start; }
.ticks .ico { width: 24px; height: 24px; padding: 4px; border-radius: 50%; background: var(--grad-gold); color: var(--lac-ink); stroke-width: 3; margin-top: 2px; }
.ticks.big li { font-size: 1.08rem; }
.ticks + p { margin-top: 24px; }

/* hai cột */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.split-art { display: grid; place-items: center; }
.split-art > .ico { width: min(260px, 60%); height: auto; aspect-ratio: 1; padding: 18%; border-radius: 40px; background: var(--ico-bg); color: var(--gold-2); box-shadow: var(--shadow); }

/* ---------- trình chiếu màn hình (vòng 3D) ---------- */
.showcase { overflow: hidden; }
.show-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(24px, 5vw, 64px); align-items: center; }
.show-tabs { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.show-tab {
  width: 100%; text-align: left; display: grid; grid-template-columns: 44px 1fr; gap: 14px; align-items: start;
  padding: 16px 18px; border-radius: var(--r-lg); border: 1px solid transparent; background: transparent;
  color: var(--ink); font: inherit; cursor: pointer; transition: background .3s, border-color .3s, box-shadow .3s;
}
.show-tab .ico { width: 44px; height: 44px; padding: 11px; border-radius: 13px; background: var(--border); color: var(--accent); transition: background .3s, color .3s; }
.show-tab b { display: block; font-size: 1.05rem; font-weight: 600; }
.show-tab span span { display: block; color: var(--muted); font-size: .94rem; line-height: 1.55; margin-top: 2px; }
.show-tab:hover { background: var(--card); }
.show-tab[aria-selected="true"] { background: var(--card); border-color: var(--border); box-shadow: var(--shadow); }
.show-tab[aria-selected="true"] .ico { background: var(--ico-bg); color: var(--gold-2); }

.carousel { position: relative; height: clamp(520px, 50vw, 640px); perspective: 1400px; }
.ring { position: absolute; inset: 0 0 60px; transform-style: preserve-3d; }
.slide { position: absolute; left: 50%; top: 50%; width: clamp(210px, 19vw, 250px); }
.slide .device { position: relative; width: 100%; }
.js .ring { --r: 330px; transform: translateZ(calc(-1 * var(--r))) rotateY(var(--angle, 0deg)); transition: transform 1s cubic-bezier(.2, .75, .2, 1); }
.js .slide { translate: -50% -50%; transition: opacity .8s, filter .8s; opacity: .35; filter: saturate(.6) brightness(.9); }
.js .slide.on { opacity: 1; filter: none; }
.js .slide.s0 { transform: rotateY(0deg) translateZ(var(--r)); }
.js .slide.s1 { transform: rotateY(72deg) translateZ(var(--r)); }
.js .slide.s2 { transform: rotateY(144deg) translateZ(var(--r)); }
.js .slide.s3 { transform: rotateY(216deg) translateZ(var(--r)); }
.js .slide.s4 { transform: rotateY(288deg) translateZ(var(--r)); }
.carousel-floor { position: absolute; left: 12%; right: 12%; bottom: 46px; height: 60px; border-radius: 50%; background: radial-gradient(closest-side, rgba(91, 26, 26, .3), transparent); filter: blur(4px); }
.car-nav { position: absolute; left: 0; right: 0; bottom: 0; display: flex; justify-content: center; gap: 10px; z-index: 3; }
.car-nav button {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border); background: var(--card); color: var(--accent);
  cursor: pointer; display: grid; place-items: center; box-shadow: var(--shadow-sm); transition: transform .2s;
}
.car-nav button:hover { transform: translateY(-2px); }
.car-nav .ico { width: 20px; height: 20px; }
.car-nav .prev .ico { transform: scaleX(-1); }
.no-js .ring { display: flex; gap: 18px; overflow-x: auto; position: static; padding: 10px 4px; scroll-snap-type: x mandatory; }
.no-js .slide { position: static; flex: none; scroll-snap-align: center; }
.no-js .carousel { height: auto; }
.no-js .car-nav, .no-js .carousel-floor { display: none; }

/* ---------- dải tối ---------- */
.band-dark {
  position: relative; overflow: hidden; color: #fff;
  background: url(../img/art/pattern.svg) 0 0 / 120px 120px, radial-gradient(900px 500px at 15% 50%, rgba(201, 120, 60, .28), transparent 60%), var(--grad-lac);
}
.band-dark h2 { color: #fff; }
.band-dark p { color: rgba(255, 255, 255, .84); }
.band-dark b { color: var(--gold-2); }
.band-dark a:not(.btn) { color: var(--gold-2); }
.band-dark .eyebrow { color: var(--gold-2); }
.band-dark .ticks li { color: rgba(255, 255, 255, .9); }
.orb-wrap { perspective: 1200px; display: grid; place-items: center; }
.orb {
  position: relative; width: min(560px, 100%); aspect-ratio: 1;
  transform: rotateX(48deg); transform-style: preserve-3d;
  animation: orb 80s linear infinite;
}
.orb img { width: 100%; height: 100%; filter: drop-shadow(0 0 30px rgba(243, 210, 138, .25)); }
.orb::before { content: ""; position: absolute; inset: 4%; border-radius: 50%; border: 1px solid rgba(243, 210, 138, .25); transform: translateZ(-40px); box-shadow: 0 0 90px rgba(243, 210, 138, .14) inset; }
@keyframes orb { from { transform: rotateX(48deg) rotateZ(0deg); } to { transform: rotateX(48deg) rotateZ(360deg); } }
.big-number { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; margin: 6px 0 18px; }
.big-number b { font: 700 clamp(3rem, 2rem + 4vw, 5rem)/1 var(--serif); background: var(--grad-gold); -webkit-background-clip: text; background-clip: text; color: transparent; white-space: nowrap; }
.big-number span { color: rgba(255, 255, 255, .8); max-width: 24ch; line-height: 1.4; }

/* ---------- máy tính bảng 3D ---------- */
.tablet-stage { perspective: 1600px; display: grid; place-items: center; padding: 20px 0; }
.tablet {
  position: relative; width: min(500px, 88%); aspect-ratio: 2064 / 2752; padding: 14px; border-radius: 34px;
  background: linear-gradient(145deg, #3A1512, #0F0303 60%, #2A0B0A);
  box-shadow: inset 0 0 0 1.5px rgba(243, 210, 138, .3), 0 60px 90px -40px rgba(40, 8, 6, .8);
  transform: rotateY(calc(-16deg + var(--px, 0) * 6deg)) rotateX(calc(6deg + var(--py, 0) * -4deg)) rotateZ(1deg);
  transform-style: preserve-3d; transition: transform .6s cubic-bezier(.2, .7, .2, 1);
}
.tablet img { width: 100%; height: 100%; object-fit: cover; border-radius: 22px; }
.tablet .chip3d { transform: translateZ(80px); }
.tablet .chip3d.c1 { left: -10%; top: 16%; }
.tablet .chip3d.c2 { right: -10%; bottom: 14%; }

/* ---------- các bước ---------- */
.steps { list-style: none; padding: 0; margin: 0 0 40px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; position: relative; }
.steps::before { content: ""; position: absolute; left: 12%; right: 12%; top: 31px; border-top: 2px dashed var(--gold-3); opacity: .6; }
.steps li { position: relative; text-align: center; padding: 0 8px; }
.step-n {
  width: 62px; height: 62px; margin: 0 auto 18px; border-radius: 50%; display: grid; place-items: center; position: relative;
  font: 700 1.5rem/1 var(--serif); color: var(--gold-2); background: var(--grad-lac);
  box-shadow: 0 0 0 6px var(--page), 0 0 0 7px var(--border), 0 16px 30px -12px rgba(91, 26, 26, .8);
}
.section-alt .step-n { box-shadow: 0 0 0 6px var(--page-alt), 0 0 0 7px var(--border), 0 16px 30px -12px rgba(91, 26, 26, .8); }
.steps p { color: var(--muted); font-size: .96rem; }

/* ---------- kêu gọi cuối trang ---------- */
.cta {
  position: relative; overflow: hidden; color: #fff; text-align: center;
  padding: clamp(80px, 10vw, 130px) 0;
  background: url(../img/art/pattern.svg) 0 0 / 120px 120px, radial-gradient(700px 360px at 50% 110%, rgba(240, 160, 79, .45), transparent 70%), var(--grad-lac);
}
.cta::before { content: ""; position: absolute; inset: auto 0 0 0; height: 60%; background: url(../img/art/hero-far.svg) 50% 100% / cover no-repeat; opacity: .5; -webkit-mask-image: linear-gradient(transparent, #000 70%); mask-image: linear-gradient(transparent, #000 70%); }
.cta-in { position: relative; display: flex; flex-direction: column; align-items: center; }
.cta h2 { color: #fff; max-width: 22ch; font-size: clamp(2rem, 1.3rem + 3vw, 3.3rem); text-wrap: balance; }
.cta p { color: rgba(255, 255, 255, .86); max-width: 56ch; font-size: 1.08rem; }
.cta .store-row { justify-content: center; margin: 12px 0 8px; }
.cta .btn { margin: 6px; }

/* ---------- tiêu đề trang con ---------- */
.page-head {
  position: relative; overflow: hidden; color: #fff;
  margin-top: calc(-1 * var(--top-h));
  padding: calc(var(--top-h) + clamp(48px, 7vw, 92px)) 0 clamp(72px, 8vw, 110px);
  background: url(../img/art/pattern.svg) 0 0 / 120px 120px, radial-gradient(800px 380px at 85% 0%, rgba(240, 160, 79, .35), transparent 70%), var(--grad-lac);
}
.page-head::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 48px; background: var(--page); clip-path: ellipse(62% 100% at 50% 100%); }
.page-head::before { content: ""; position: absolute; right: -60px; top: 18%; width: 520px; height: 260px; background: url(../img/art/clouds.svg) 0 0 / cover no-repeat; opacity: .35; }
.page-head .wrap { position: relative; z-index: 1; }
.page-head h1 { font-size: clamp(2.1rem, 1.4rem + 3vw, 3.5rem); max-width: 22ch; text-wrap: balance; }
.page-head .lead { color: rgba(255, 255, 255, .86); max-width: 62ch; margin: 0; }
.page-head .eyebrow { color: var(--gold-2); }
.page-head .doc-meta { color: var(--gold); margin: 10px 0 0; font-size: .95rem; }
.page-head.notfound { min-height: 70vh; display: flex; align-items: center; }
.page-head.notfound .eyebrow { font: 700 clamp(4rem, 10vw, 7rem)/1 var(--serif); letter-spacing: 0; text-transform: none; background: var(--grad-gold); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-head.notfound .eyebrow::before { display: none; }
.page-head.notfound .btn { margin-top: 26px; }

/* ---------- trang tài liệu (privacy, support, terms) ---------- */
.doc { display: grid; grid-template-columns: 250px 1fr; gap: clamp(28px, 4vw, 56px); align-items: start; }
.doc-toc {
  position: sticky; top: calc(var(--top-h) + 20px);
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 20px 22px; box-shadow: var(--shadow-sm);
  font-size: .92rem;
}
.doc-toc b { display: block; font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--gold-deep); margin-bottom: 8px; }
.doc-toc ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.doc-toc a { color: var(--ink); text-decoration: none; }
.doc-toc a:hover { color: var(--accent); text-decoration: underline; }
.doc-body { min-width: 0; max-width: 760px; }
.doc-body h2 { font-size: clamp(1.4rem, 1.1rem + 1vw, 1.75rem); margin: 1.8em 0 .55em; padding-top: 4px; }
.doc-body > h2:first-child, .doc-body .callout:first-child h2 { margin-top: 0; }
.doc-body h3 { margin: 1.4em 0 .4em; }
.doc-body ul, .doc-body ol { padding-left: 1.3em; }
.doc-body li { margin: .35em 0; }
.doc-body table { width: 100%; border-collapse: collapse; margin: 14px 0 22px; font-size: .94rem; display: block; overflow-x: auto; }
.doc-body th, .doc-body td { text-align: left; vertical-align: top; padding: 11px 14px; border-bottom: 1px solid var(--border); }
.doc-body th { background: var(--page-alt); font-weight: 600; white-space: nowrap; }
.callout { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--gold-3); border-radius: var(--r-md); padding: 22px 24px; margin: 0 0 24px; box-shadow: var(--shadow-sm); }
.callout h2 { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.note { font-size: .93rem; color: var(--muted); background: var(--page-alt); border-radius: var(--r-sm); padding: 10px 14px; border: 1px dashed var(--border); }

/* hướng dẫn: dòng thời gian */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 30px; top: 30px; bottom: 30px; width: 2px; background: linear-gradient(var(--gold-3), transparent); }
.timeline > li { display: grid; grid-template-columns: 62px 1fr; gap: 22px; margin-bottom: 42px; position: relative; }
.timeline > li .step-n { margin: 0; }
.timeline h2 { font-size: clamp(1.35rem, 1.1rem + .9vw, 1.7rem); margin-top: 12px; }
.timeline .store-row { margin-top: 10px; }

/* hỏi đáp */
.faq h2 { margin: 1.6em 0 .7em; font-size: clamp(1.4rem, 1.1rem + 1vw, 1.8rem); }
.faq h2:first-child { margin-top: 0; }
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: var(--r-md); margin-bottom: 10px; box-shadow: var(--shadow-sm); transition: border-color .3s; }
.faq details[open] { border-color: var(--gold-3); }
.faq summary { cursor: pointer; list-style: none; padding: 17px 54px 17px 20px; font-weight: 600; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 22px; top: 50%; width: 9px; height: 9px; margin-top: -7px; border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(45deg); transition: transform .3s; }
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq details > :not(summary) { padding: 0 20px; color: var(--muted); }
.faq details > :last-child { padding-bottom: 6px; }
.faq-more { margin-top: 32px; text-align: center; }

/* ---------- chân trang ---------- */
.footer { background: var(--lac-ink); color: rgba(255, 255, 255, .78); padding: 64px 0 28px; font-size: .94rem; position: relative; }
.footer::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px; background: var(--grad-gold); opacity: .7; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; }
.footer-brand p { margin: 16px 0 0; max-width: 34ch; color: rgba(255, 255, 255, .7); }
.footer h2 { font: 700 .78rem/1.3 var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--gold-2); margin: 6px 0 14px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.footer a { color: rgba(255, 255, 255, .82); text-decoration: none; }
.footer a:hover { color: var(--gold-2); text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: .86rem; }
.footer .langs-foot { display: flex; gap: 4px; }
.footer .langs-foot a { padding: 4px 10px; border-radius: 999px; }
.footer .langs-foot a[aria-current="true"] { background: rgba(243, 210, 138, .16); color: var(--gold-2); }
.footer-bottom > a { color: var(--gold-2); }

/* Playfair mặc định số kiểu cổ; `font:` viết tắt ở trên xoá font-variant nên đặt ở đây. */
.stat b, .big-number b, .step-n, .page-head.notfound .eyebrow { font-variant-numeric: lining-nums; }

/* ---------- hiện dần khi cuộn ---------- */
.js [data-reveal] { opacity: 0; translate: 0 46px; transition: opacity .9s cubic-bezier(.2, .7, .2, 1), translate .9s cubic-bezier(.2, .7, .2, 1), transform .4s cubic-bezier(.2, .7, .2, 1), box-shadow .3s, border-color .3s; transition-delay: var(--d, 0s); }
.js [data-reveal].in { opacity: 1; translate: 0 0; }
.js [data-reveal].in.tilting { transition: opacity .9s, translate .9s, transform .08s linear, box-shadow .3s; transition-delay: 0s; }

/* ---------- màn hình vừa ---------- */
@media (max-width: 1080px) {
  .nav { gap: 10px; }
  .nav > ul:first-child a { padding: 8px 8px; }
  .chip3d.c1 { left: 0; } .chip3d.c2 { right: 0; }
}
@media (max-width: 960px) {
  :root { --top-h: 62px; }
  .menu-btn { display: block; }
  .nav {
    position: absolute; left: 0; right: 0; top: var(--top-h);
    flex-direction: column; align-items: stretch; gap: 14px; padding: 14px var(--gutter) 22px;
    background: rgba(26, 7, 6, .97); border-bottom: 1px solid rgba(243, 210, 138, .16);
    box-shadow: 0 30px 40px -24px rgba(0, 0, 0, .8);
    visibility: hidden; opacity: 0; transform: translateY(-8px); transition: opacity .25s, transform .25s, visibility 0s .25s;
    max-height: calc(100vh - var(--top-h)); overflow-y: auto;
  }
  .menu-open .nav { visibility: visible; opacity: 1; transform: none; transition: opacity .25s, transform .25s; }
  .no-js .nav { visibility: visible; opacity: 1; transform: none; }
  .no-js .menu-btn { display: none; }
  .nav > ul:first-child { flex-direction: column; align-items: stretch; }
  .nav > ul:first-child a { padding: 12px 10px; font-size: 1.02rem; border-radius: 10px; }
  .nav .langs { align-self: flex-start; }
  .nav-admin { align-self: stretch; }
  .hero-in, .split, .show-grid { grid-template-columns: 1fr; }
  .hero-sun { left: 50%; top: 68%; width: clamp(220px, 60vw, 380px); } /* sau cụm điện thoại, không sau chữ */
  .stage { height: clamp(420px, 88vw, 560px); max-width: 620px; width: 100%; margin: 0 auto; }
  .device { width: clamp(170px, 34vw, 240px); }
  .stats-in { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3)::before { display: none; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
  .cards-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 36px; }
  .steps::before { display: none; }
  .orb { width: min(460px, 92%); }
  .split-rev > .orb-wrap, .split > .tablet-stage { order: -1; }
  .doc { grid-template-columns: 1fr; }
  .doc-toc { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding-bottom: 150px; }
  .hero .store-row .store { flex: 1 1 140px; min-width: 0; padding: 9px 12px; gap: 9px; }
  .store span { font-size: 1rem; white-space: nowrap; }
  .store svg { width: 24px; height: 24px; }
  .hero-layer { top: auto; height: 560px; object-position: 74% 100%; }
  .hero-far { height: 640px; }
  .chip3d { transform: translateZ(110px); }
  .stage { height: 118vw; max-height: 520px; }
  .device { width: 46vw; max-width: 230px; border-radius: 28px; padding: 7px; }
  .device img, .device::after { border-radius: 22px; }
  .device::after { inset: 7px; }
  .device.d-left { left: -4%; } .device.d-right { right: -4%; }
  .chip3d { font-size: .74rem; padding: 8px 10px; }
  .chip3d b { font-size: .82rem; }
  .chip3d .ico { width: 28px; height: 28px; padding: 6px; }
  .chip3d.c1 { top: 2%; left: 0; } .chip3d.c2 { bottom: 2%; right: 0; }
  .stat { padding: 20px 16px; }
  .cards-3, .cards-2 { grid-template-columns: 1fr; }
  .mini.cards-2 { grid-template-columns: 1fr 1fr; gap: 12px; }
  .mini .card { padding: 16px; }
  .card { padding: 22px; }
  .steps { grid-template-columns: 1fr; }
  .show-tab { padding: 12px; grid-template-columns: 40px 1fr; }
  .show-tab .ico { width: 40px; height: 40px; padding: 10px; }
  .js .show-tab:not([aria-selected="true"]) span span { display: none; }
  .carousel { height: 500px; }
  .slide { width: 190px; }
  .js .ring { --r: 220px; }
  .tablet .chip3d.c1 { left: -4%; } .tablet .chip3d.c2 { right: -4%; }
  .timeline::before { left: 22px; }
  .timeline > li { grid-template-columns: 46px 1fr; gap: 14px; }
  .timeline .step-n { width: 46px; height: 46px; font-size: 1.15rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .scroll-cue { display: none; }
}

/* ---------- giảm chuyển động ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js [data-reveal] { opacity: 1; translate: 0 0; }
  .embers { display: none; }
}