/* ============================================================
   AI MEDIA → GROWTH — TAS Global
   Direction: phòng dựng phim. Nền graphite (không phải đen tuyền)
   để 9 video output giữ đúng tương phản. Hai nguồn sáng:
   tungsten (ấm) = đầu ra / tiền / hành động,
   daylight (lạnh) = cấu trúc / đầu vào / chú thích.
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root {
  /* Ground */
  --bg:        #191b1f;
  --bg-deep:   #121418;
  --surface:   #212429;
  --raised:    #292d34;
  --line:      #383d47;
  --line-soft: #262a31;

  /* Ink */
  --fg:        #f2f0ed;
  --fg-dim:    #a8aeb8;
  --fg-faint:  #757c88;

  /* Tungsten — key light */
  --tung:      #e8a13c;
  --tung-hi:   #ffc275;
  --tung-deep: #b4711a;
  --tung-glow: rgba(232, 161, 60, .18);

  /* Daylight — fill */
  --day:       #8ec5ff;
  --day-soft:  rgba(142, 197, 255, .14);

  /* Signal */
  --ok:        #6ee7a8;
  --bad:       #ff7a6b;

  /* Type */
  --display: "Archivo", "Be Vietnam Pro", system-ui, sans-serif;
  --body:    "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, "Cascadia Mono", monospace;

  /* Space */
  --gut: clamp(1rem, 4vw, 2.5rem);
  --sec: clamp(4.5rem, 9vw, 8rem);
  --r:   14px;
  --r-lg: 22px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
:focus-visible {
  outline: 2px solid var(--tung);
  outline-offset: 3px;
  border-radius: 4px;
}
::selection { background: var(--tung); color: #14161a; }

/* ---------- 3. Primitives ---------- */
.wrap { width: min(1180px, 100% - var(--gut) * 2); margin-inline: auto; }
.wrap--narrow { width: min(820px, 100% - var(--gut) * 2); }

.section { padding-block: var(--sec); position: relative; }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }
.section--edge { border-top: 1px solid var(--line-soft); }

.eyebrow {
  font-family: var(--mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--day);
  display: inline-flex;
  align-items: center;
  gap: .6rem;
}
.eyebrow::before {
  content: "";
  width: 18px; height: 1px;
  background: var(--day);
  opacity: .6;
}

/* Chữ hoa tiếng Việt có dấu chồng (Ữ, Ẫ, Ộ) nên cần nhiều khoảng dọc hơn
   tiếng Anh — line-height dưới 1.0 sẽ cắt cụt dấu ở dòng trên. */
.h1, .h2, .h3 {
  font-family: var(--display);
  font-weight: 800;
  font-stretch: 118%;
  line-height: 1.06;
  letter-spacing: -.02em;
  text-transform: uppercase;
  text-wrap: balance;          /* chia đều các dòng, không để một chữ rơi lại */
}
.h1 { font-size: clamp(2.6rem, 7.2vw, 5.1rem); line-height: 1.04; }
.h2 { font-size: clamp(1.9rem, 4.4vw, 3.2rem); max-width: 24ch; }
.h3 { font-size: clamp(1.25rem, 2.2vw, 1.7rem); font-stretch: 108%; letter-spacing: -.01em; line-height: 1.18; }

/* Bỏ chữ mồ côi ở dòng cuối đoạn văn. Áp cho toàn bộ chữ chạy. */
p, li, figcaption, dd { text-wrap: pretty; }

.lede {
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  color: var(--fg-dim);
  max-width: 54ch;
  text-wrap: pretty;
}
.mono { font-family: var(--mono); }
.tung { color: var(--tung); }
.dim { color: var(--fg-dim); }
.faint { color: var(--fg-faint); }

/* Hai bậc chữ nhỏ, dùng chung cho mọi chú thích trong trang.
   Trước đây rải rác 6 giá trị inline (.72 .75 .85 .86 .92) cho cùng một
   việc — sát nhau tới mức không tạo được phân cấp nào, lại nằm ngoài
   hệ token. Gom về hai bậc cách nhau 1.25 lần. */
.txt-sm  { font-size: .9rem;  line-height: 1.55; }
.txt-cap { font-size: .72rem; line-height: 1.5; }

.rule { height: 1px; background: var(--line-soft); border: 0; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  padding: .95rem 1.5rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .01em;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease;
  border: 1px solid transparent;
  text-align: center;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: var(--tung);
  color: #16181c;
  box-shadow: 0 0 0 0 var(--tung-glow);
}
.btn--primary:hover { background: var(--tung-hi); box-shadow: 0 10px 30px -8px var(--tung-glow); }
.btn--ghost {
  border-color: var(--line);
  color: var(--fg);
  background: rgba(255,255,255,.02);
}
.btn--ghost:hover { border-color: var(--fg-faint); background: rgba(255,255,255,.05); }
.btn--block { width: 100%; }
.btn--lg { padding: 1.1rem 1.8rem; font-size: 1rem; }
.btn--sm { padding: .6rem 1rem; font-size: .9rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }

/* Chips */
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .42rem .7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-dim);
  white-space: nowrap;
}
.chip--live { border-color: var(--tung-deep); color: var(--tung); }
.chip--live::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--tung);
  margin-right: .5rem;
  vertical-align: middle;
  animation: blink 1.8s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.25} }

/* ---------- 4. Header ---------- */
.hdr {
  position: sticky; top: 0; z-index: 60;
  background: rgba(19,21,25,.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.hdr__in {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-block: .85rem;
}
.brand {
  font-family: var(--display);
  font-weight: 800; font-stretch: 118%;
  text-transform: uppercase;
  letter-spacing: -.01em;
  font-size: 1.02rem;
  display: flex; align-items: center; gap: .45rem;
}
.brand__arrow { color: var(--tung); }
.nav { display: none; gap: 1.9rem; font-size: .88rem; color: var(--fg-dim); }
.nav a { transition: color .18s; }
.nav a:hover { color: var(--fg); }
.hdr__cta { display: none; }
.burger {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  border: 1px solid var(--line); border-radius: 10px;
}
.burger span { display: block; width: 17px; height: 1.5px; background: var(--fg); position: relative; }
.burger span::before, .burger span::after {
  content: ""; position: absolute; left: 0; width: 17px; height: 1.5px; background: var(--fg);
}
.burger span::before { top: -5.5px; } .burger span::after { top: 5.5px; }

.mnav {
  display: none;
  border-top: 1px solid var(--line-soft);
  background: var(--bg-deep);
  padding: 1rem var(--gut) 1.4rem;
}
.mnav.is-open { display: block; }
.mnav a { display: block; padding: .7rem 0; color: var(--fg-dim); border-bottom: 1px solid var(--line-soft); }

@media (min-width: 900px) {
  .nav { display: flex; }
  .hdr__cta { display: inline-flex; }
  .burger { display: none; }
  .mnav { display: none !important; }
}

/* ---------- 5. Hero ---------- */
.hero { padding-block: clamp(2.5rem, 6vw, 5rem) var(--sec); position: relative; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute; inset: -20% -10% auto -10%; height: 70%;
  background: radial-gradient(60% 60% at 70% 0%, var(--tung-glow), transparent 70%);
  pointer-events: none;
}
.hero__grid { display: grid; gap: clamp(2.5rem, 5vw, 4rem); position: relative; }

.hero__title { margin-top: 1.15rem; }
.hero__title .h1 { display: block; }
.hero__title .h1 + .h1 { display: flex; align-items: baseline; gap: .3em; }
.hero__sub {
  margin-top: 1.15rem;
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  color: var(--fg-dim);
  max-width: 46ch;
}
.hero__pipe {
  display: flex; flex-wrap: wrap; align-items: center; gap: .55rem;
  margin-top: 1.5rem;
  font-family: var(--mono); font-size: .74rem;
  letter-spacing: .14em; text-transform: uppercase;
}
.hero__pipe b { font-weight: 700; color: var(--fg); }
.hero__pipe i { font-style: normal; color: var(--tung); }

.hero__meta { margin-top: 1.9rem; display: grid; gap: .55rem; font-size: .92rem; color: var(--fg-dim); }
.hero__meta li { display: flex; gap: .65rem; align-items: flex-start; }
.hero__meta svg { flex: none; margin-top: .3rem; color: var(--day); }

.hero__buy { margin-top: 2rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.25rem; }
.hero__cta .btn { flex: 1 1 210px; }

/* Price block */
.price {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, var(--surface), rgba(33,36,41,.4));
  padding: 1.4rem 1.5rem;
}
.price__row { display: flex; align-items: baseline; flex-wrap: wrap; gap: .7rem; }
.price__was {
  font-family: var(--mono); font-size: 1rem; color: var(--fg-faint);
  text-decoration: line-through; text-decoration-color: var(--bad);
}
.price__now {
  font-family: var(--display); font-weight: 800; font-stretch: 118%;
  font-size: clamp(2.3rem, 5vw, 3.2rem); line-height: 1;
  color: var(--tung); letter-spacing: -.02em;
}
.price__unit { font-family: var(--mono); font-size: .8rem; color: var(--fg-dim); }
.price__note { margin-top: .7rem; font-size: .84rem; color: var(--fg-dim); }

/* Countdown */
.cd { display: flex; align-items: center; gap: .5rem; margin-top: .9rem; flex-wrap: wrap; }
.cd__label { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--fg-faint); }
.cd__t { display: flex; gap: .35rem; }
.cd__u {
  font-family: var(--mono); font-weight: 700; font-size: .95rem;
  background: var(--raised); border: 1px solid var(--line);
  border-radius: 7px; padding: .25rem .5rem; min-width: 2.9rem; text-align: center;
}
.cd__u small { display: block; font-size: .52rem; letter-spacing: .1em; color: var(--fg-faint); font-weight: 400; }

/* ---------- 6. Reel (hero video) ---------- */
.reel { display: grid; gap: .9rem; }
.reel__stage {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-deep);
  border: 1px solid var(--line);
  aspect-ratio: 9 / 16;
  max-height: 68vh;
  margin-inline: auto;
  width: 100%;
  max-width: 380px;
}
.reel__stage video { width: 100%; height: 100%; object-fit: cover; }
.reel__badge {
  position: absolute; top: .8rem; left: .8rem;
  font-family: var(--mono); font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  background: rgba(18,20,24,.78); backdrop-filter: blur(6px);
  border: 1px solid var(--line); border-radius: 6px;
  padding: .3rem .55rem; color: var(--fg-dim);
}
.reel__sound {
  position: absolute; bottom: .8rem; right: .8rem;
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .1em; text-transform: uppercase;
  background: rgba(18,20,24,.78); backdrop-filter: blur(6px);
  border: 1px solid var(--line); border-radius: 999px;
  padding: .4rem .7rem; color: var(--fg);
}
.reel__sound:hover { border-color: var(--tung); color: var(--tung); }

.reel__cap { text-align: center; }
.strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 62px;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .4rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
  justify-content: start;
  max-width: 380px;
  margin-inline: auto;
  width: 100%;
}
.strip::-webkit-scrollbar { height: 5px; }
.strip::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }
.strip__i {
  aspect-ratio: 9 / 16;
  border-radius: 7px;
  overflow: hidden;
  border: 1.5px solid transparent;
  opacity: .5;
  transition: opacity .2s, border-color .2s;
  position: relative;
}
.strip__i img { width: 100%; height: 100%; object-fit: cover; }
.strip__i:hover { opacity: .85; }
.strip__i.is-on { opacity: 1; border-color: var(--tung); }

/* ---------- 7. Output grid ---------- */
/* Số cột đặt cứng theo từng breakpoint. Đã thử repeat(auto-fit, minmax())
   nhưng track rỗng không co lại, để 5 ô dồn trái và hở một mảng bên phải.
   Hai lưới có số phần tử cố định (5 và 4) nên đặt thẳng là chắc ăn nhất. */
.outgrid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .9rem;
  margin-top: 2rem;
}
.vcard {
  position: relative;
  border-radius: var(--r);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--bg-deep);
  aspect-ratio: 9 / 16;
  transition: border-color .2s, transform .2s;
  width: 100%;
  display: block;
  text-align: left;
}
.vcard:hover { border-color: var(--tung); transform: translateY(-3px); }
.vcard img { width: 100%; height: 100%; object-fit: cover; transition: opacity .2s; }
.vcard:hover img { opacity: .78; }
.vcard__cap {
  position: absolute; inset: auto 0 0 0;
  padding: 2.2rem .7rem .65rem;
  background: linear-gradient(180deg, transparent, rgba(15,17,20,.92));
  font-size: .74rem; line-height: 1.3; font-weight: 600;
}
.vcard__dur {
  position: absolute; top: .55rem; right: .55rem;
  font-family: var(--mono); font-size: .6rem;
  background: rgba(15,17,20,.8); border-radius: 5px; padding: .18rem .38rem;
  color: var(--fg-dim);
}
.vcard__play {
  position: absolute; inset: 0; display: grid; place-items: center;
  opacity: 0; transition: opacity .2s;
}
.vcard:hover .vcard__play, .vcard:focus-visible .vcard__play { opacity: 1; }
.vcard__play span {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--tung); color: #16181c;
  display: grid; place-items: center;
}

.grouphead {
  display: flex; align-items: baseline; gap: .8rem;
  margin-top: 3rem; padding-bottom: .7rem;
  border-bottom: 1px solid var(--line-soft);
}
.grouphead:first-of-type { margin-top: 2.4rem; }
.grouphead h3 {
  font-family: var(--mono); font-size: .78rem; font-weight: 700;
  letter-spacing: .18em; text-transform: uppercase;
}
.grouphead p { font-size: .82rem; color: var(--fg-faint); }

/* ---------- 8. Problem ---------- */
.probs { display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--r-lg); overflow: hidden; margin-top: 2.5rem; }
.prob { background: var(--bg); padding: 1.7rem 1.5rem; }
.prob__n { font-family: var(--mono); font-size: .7rem; color: var(--bad); letter-spacing: .14em; }
.prob h3 { font-size: 1.05rem; font-weight: 700; margin-top: .7rem; text-wrap: balance; }
.prob p { font-size: .92rem; color: var(--fg-dim); margin-top: .5rem; }

/* ---------- 9. Curriculum — the pipeline rail ---------- */
.pipe { margin-top: 3rem; position: relative; }
.pipe::before {
  content: ""; position: absolute; left: 7px; top: 10px; bottom: 10px; width: 1px;
  background: linear-gradient(180deg, transparent, var(--line) 6%, var(--line) 94%, transparent);
}
.ses { position: relative; padding-left: 2.4rem; padding-bottom: 2.6rem; }
.ses:last-child { padding-bottom: 0; }
.ses__dot {
  position: absolute; left: 0; top: 6px;
  width: 15px; height: 15px; border-radius: 3px;
  background: var(--bg); border: 1.5px solid var(--line);
}
.ses__dot::after {
  content: ""; position: absolute; inset: 3px; border-radius: 1px; background: var(--tung);
  opacity: 0; transition: opacity .3s;
}
.ses.is-in .ses__dot::after { opacity: 1; }
.ses__date {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--day);
}
.ses__hd { display: flex; flex-wrap: wrap; align-items: baseline; gap: .5rem .9rem; margin-top: .5rem; }
.ses__n {
  font-family: var(--display); font-weight: 800; font-stretch: 125%;
  font-size: 1.5rem; color: var(--fg-faint); line-height: 1;
}
.ses__t { font-size: clamp(1.05rem, 2vw, 1.35rem); font-weight: 700; line-height: 1.25; flex: 1 1 260px; text-wrap: balance; }
.ses__by {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--fg-dim); border: 1px solid var(--line); border-radius: 999px; padding: .22rem .6rem;
}
.ses__tag { font-size: .92rem; color: var(--fg-dim); margin-top: .6rem; font-style: italic; }
.ses__body { margin-top: 1.1rem; display: grid; gap: 1.1rem; }

/* Dấu đầu dòng đặt tuyệt đối, KHÔNG dùng flex.
   Flex biến mỗi thẻ con (<b>, <ul>) thành một cột riêng — chính là lý do
   "Video animation bán hàng" và "bằng Veo 3" bị tách làm hai cột. */
.ses__list { display: grid; gap: .6rem; list-style: none; padding: 0; margin: 0; }
.ses__list li { position: relative; padding-left: 1.3rem; font-size: .93rem; color: var(--fg-dim); }
.ses__list li::before { content: "▸"; position: absolute; left: 0; top: 0; color: var(--day); opacity: .8; }
.ses__list b { color: var(--fg); font-weight: 600; }
.ses__list ul { display: grid; gap: .4rem; margin: .5rem 0 0 0; padding: 0; list-style: none; }
.ses__list ul li { font-size: .87rem; color: var(--fg-faint); padding-left: 1.1rem; }
.ses__list ul li::before { content: "–"; color: var(--fg-faint); opacity: 1; }
.ses__phase {
  display: block;
  font-family: var(--mono); font-size: .66rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--fg-faint); margin-bottom: .35rem;
}

/* Deliverable ledger — the signature */
.out {
  border: 1px solid var(--tung-deep);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(232,161,60,.07), rgba(232,161,60,.02));
  padding: 1.1rem 1.2rem;
}
.out__hd {
  font-family: var(--mono); font-size: .66rem; font-weight: 700;
  letter-spacing: .18em; text-transform: uppercase; color: var(--tung);
  display: flex; align-items: center; gap: .55rem;
}
.out__hd::after { content: ""; flex: 1; height: 1px; background: var(--tung-deep); opacity: .45; }
.out__list { display: grid; gap: .5rem; margin-top: .8rem; list-style: none; padding: 0; }
.out__list li { position: relative; padding-left: 1.35rem; font-size: .9rem; }
.out__list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--tung); font-weight: 700; }

/* ---------- 10. Instructors ---------- */
.gvs { display: grid; gap: 1.4rem; margin-top: 2.8rem; }
.gv {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: var(--surface);
  overflow: hidden;
  display: grid;
}
.gv__pic { position: relative; aspect-ratio: 16 / 9; background: var(--bg-deep); overflow: hidden; }
.gv__pic img { width: 100%; height: 100%; object-fit: cover; }
.gv__pic::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(33,36,41,.85));
}
.gv__body { padding: 1.5rem; }
.gv__name { font-family: var(--display); font-weight: 800; font-stretch: 112%; text-transform: uppercase; font-size: 1.4rem; letter-spacing: -.01em; }
.gv__role { font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--tung); margin-top: .45rem; }
.gv__list { display: grid; gap: .55rem; margin-top: 1.1rem; list-style: none; padding: 0; }
.gv__list li { position: relative; padding-left: 1rem; font-size: .88rem; color: var(--fg-dim); line-height: 1.55; }
.gv__list li::before { content: ""; position: absolute; left: 0; top: .62rem; width: 4px; height: 4px; border-radius: 50%; background: var(--day); }
.gv__stats { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.1rem; }
.gv__stat { border: 1px solid var(--line); border-radius: 8px; padding: .5rem .75rem; }
.gv__stat b { font-family: var(--mono); font-size: 1rem; color: var(--tung); display: block; }
.gv__stat small { font-size: .68rem; color: var(--fg-faint); }
.gv__more {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--day); margin-top: 1.1rem; display: inline-flex; align-items: center; gap: .4rem;
}
.gv__fold { display: none; margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--line-soft); }
.gv__fold.is-open { display: block; }
.gv__fold h4 { font-family: var(--mono); font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; color: var(--fg-faint); margin-bottom: .6rem; }

/* ---------- 11. Gallery ---------- */
/* 6 ảnh: đặt cứng 3 cột ở desktop để thành 3+3, không lệch 4+2 */
.gal { display: grid; grid-template-columns: repeat(2, 1fr); gap: .8rem; margin-top: 2.2rem; }
@media (min-width: 900px) { .gal { grid-template-columns: repeat(3, 1fr); } }
.gal img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-radius: var(--r); border: 1px solid var(--line-soft); }

/* ---------- 12. Pricing + form ---------- */
.buy { display: grid; gap: 1.5rem; margin-top: 2.8rem; align-items: start; }

.plans { display: grid; gap: 1rem; }
.plan {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: 1.5rem;
  position: relative;
  transition: border-color .2s, background .2s;
  cursor: pointer;
  display: block;
}
.plan:hover { border-color: var(--fg-faint); }
.plan.is-on { border-color: var(--tung); background: linear-gradient(180deg, rgba(232,161,60,.08), var(--surface)); }
.plan__tag {
  position: absolute; top: -9px; right: 16px;
  font-family: var(--mono); font-size: .6rem; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
  background: var(--tung); color: #16181c;
  border-radius: 5px; padding: .2rem .5rem;
}
.plan__hd { display: flex; align-items: flex-start; gap: .8rem; }
.plan__radio {
  flex: none; width: 19px; height: 19px; border-radius: 50%;
  border: 1.5px solid var(--line); margin-top: .25rem; position: relative;
}
.plan.is-on .plan__radio { border-color: var(--tung); }
.plan.is-on .plan__radio::after {
  content: ""; position: absolute; inset: 3.5px; border-radius: 50%; background: var(--tung);
}
.plan__hd > span:last-child { flex: 1; min-width: 0; }
.plan__name { display: block; font-weight: 700; font-size: 1.02rem; }
.plan__amt {
  display: block;
  font-family: var(--display); font-weight: 800; font-stretch: 118%;
  font-size: 2rem; line-height: 1.1; margin-top: .4rem; letter-spacing: -.02em;
}
.plan.is-on .plan__amt { color: var(--tung); }
.plan__sub { display: block; font-size: .86rem; color: var(--fg-dim); margin-top: .5rem; }
.plan__list { display: grid; gap: .4rem; margin-top: .9rem; list-style: none; padding: 0; }
.plan__list li { position: relative; padding-left: 1.15rem; font-size: .84rem; color: var(--fg-dim); }
.plan__list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--ok); }

.incl { border: 1px solid var(--line-soft); border-radius: var(--r-lg); padding: 1.3rem 1.4rem; background: rgba(255,255,255,.015); }
.incl h3 { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--fg-faint); }
.incl ul { display: grid; gap: .55rem; margin-top: .9rem; list-style: none; padding: 0; }
.incl li { position: relative; padding-left: 1.25rem; font-size: .89rem; color: var(--fg-dim); }
.incl li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--tung); }

/* Form */
.form {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: clamp(1.3rem, 3vw, 1.9rem);
  /* sticky chỉ bật ở desktop — trên điện thoại form cao hơn màn hình,
     dính lại chỉ làm cuộn giật */
}
.form__hd { font-family: var(--display); font-weight: 800; font-stretch: 112%; text-transform: uppercase; font-size: 1.2rem; }
.form__note { font-size: .82rem; color: var(--fg-dim); margin-top: .4rem; }
.fieldset { display: grid; gap: .85rem; margin-top: 1.3rem; border: 0; padding: 0; }
.field { display: grid; gap: .35rem; }
.field > label {
  font-family: var(--mono); font-size: .64rem; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase; color: var(--fg-faint);
}
.input {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: .78rem .85rem;
  font-size: .93rem;
  transition: border-color .16s, box-shadow .16s;
}
.input::placeholder { color: var(--fg-faint); }
.input:focus { outline: none; border-color: var(--tung); box-shadow: 0 0 0 3px var(--tung-glow); }
.input[aria-invalid="true"] { border-color: var(--bad); }
select.input { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--fg-faint) 50%), linear-gradient(135deg, var(--fg-faint) 50%, transparent 50%); background-position: calc(100% - 18px) 52%, calc(100% - 13px) 52%; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 2.2rem; }
textarea.input { resize: vertical; min-height: 68px; }
.err { font-size: .76rem; color: var(--bad); min-height: 0; }
.err:empty { display: none; }

.check { display: flex; gap: .6rem; align-items: flex-start; cursor: pointer; font-size: .88rem; }
.check input { flex: none; width: 17px; height: 17px; margin-top: .18rem; accent-color: var(--tung); }
.subfields { display: grid; gap: .7rem; margin-top: .8rem; padding: 1rem; border: 1px solid var(--line-soft); border-radius: var(--r); background: var(--bg-deep); }
.hidden { display: none !important; }

.vch { display: flex; gap: .5rem; }
.vch .input { flex: 1; text-transform: uppercase; }
.vch .btn { flex: none; padding-inline: 1.1rem; }
.vmsg { font-size: .78rem; margin-top: .4rem; }
.vmsg--ok { color: var(--ok); }
.vmsg--bad { color: var(--bad); }
/* Gói đặt cọc không dùng được mã — làm mờ thay vì để khách gõ rồi báo lỗi */
#voucherBox.is-off .vch { opacity: .4; }
#voucherBox.is-off .input { cursor: not-allowed; }

.total {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem;
  margin-top: 1.3rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
}
.total__l { font-family: var(--mono); font-size: .66rem; letter-spacing: .14em; text-transform: uppercase; color: var(--fg-faint); flex: none; max-width: 8rem; }
.total__v { font-family: var(--display); font-weight: 800; font-stretch: 118%; font-size: 2rem; color: var(--tung); line-height: 1; letter-spacing: -.02em; }
.total__sub { font-size: .76rem; color: var(--fg-faint); text-align: right; margin-top: .3rem; }

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* ---------- 13. FAQ ---------- */
.faq { margin-top: 2.5rem; display: grid; gap: .6rem; }
.faq__i { border: 1px solid var(--line-soft); border-radius: var(--r); background: var(--surface); overflow: hidden; }
.faq__i.is-open { border-color: var(--line); }
.faq__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.1rem 1.3rem; text-align: left; font-weight: 600; font-size: .97rem;
}
.faq__q svg { flex: none; color: var(--fg-faint); transition: transform .25s; }
.faq__i.is-open .faq__q svg { transform: rotate(45deg); color: var(--tung); }
.faq__a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .28s ease; }
.faq__i.is-open .faq__a { grid-template-rows: 1fr; }
.faq__a > div { overflow: hidden; }
.faq__a p { padding: 0 1.3rem 1.2rem; font-size: .9rem; color: var(--fg-dim); }

/* ---------- 14. Payment ---------- */
.pay { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; background: var(--surface); margin-top: 2.2rem; }
.pay__side { padding: clamp(1.4rem, 3vw, 2rem); background: var(--bg-deep); border-bottom: 1px solid var(--line); }
.pay__main { padding: clamp(1.4rem, 3vw, 2rem); display: grid; justify-items: center; text-align: center; gap: 1.2rem; }
.pay__lbl { font-family: var(--mono); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: var(--fg-faint); }
.pay__val { font-weight: 700; font-size: .98rem; margin-top: .2rem; word-break: break-word; }
.pay__block + .pay__block { margin-top: 1.1rem; }
.pay__code {
  font-family: var(--mono); font-weight: 700; font-size: .95rem; letter-spacing: .04em;
  background: var(--tung-glow); border: 1px solid var(--tung-deep); color: var(--tung-hi);
  border-radius: 7px; padding: .45rem .7rem; display: inline-block; margin-top: .3rem;
  word-break: break-all;
}
.pay__amt { font-family: var(--display); font-weight: 800; font-stretch: 118%; font-size: 2.2rem; color: var(--tung); line-height: 1; margin-top: .3rem; letter-spacing: -.02em; }
.pay__qr { background: #fff; padding: .7rem; border-radius: var(--r); width: 232px; height: 232px; display: grid; place-items: center; }
.pay__qr img { width: 100%; height: 100%; object-fit: contain; }
.pay__qr--empty { background: var(--raised); border: 1px dashed var(--line); }
.pay__bank { display: grid; gap: .45rem; font-size: .9rem; width: 100%; }
.pay__bank .row { display: flex; align-items: center; justify-content: space-between; gap: .8rem; border-bottom: 1px solid var(--line-soft); padding-bottom: .45rem; }
.pay__bank .row span { color: var(--fg-faint); font-size: .78rem; font-family: var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.pay__bank .row b { font-weight: 700; text-align: right; }
.copy {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase;
  border: 1px solid var(--line); border-radius: 6px; padding: .22rem .45rem; color: var(--fg-dim);
  transition: border-color .16s, color .16s;
}
.copy:hover { border-color: var(--tung); color: var(--tung); }
.copy.is-done { border-color: var(--ok); color: var(--ok); }

.status { display: flex; align-items: center; gap: .6rem; font-size: .85rem; color: var(--fg-dim); }
.status__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--tung); animation: blink 1.4s infinite; flex: none; }
.status--ok .status__dot { background: var(--ok); animation: none; }
.status--bad .status__dot { background: var(--bad); animation: none; }

/* Cùng cách xử lý với .out (khung viền mảnh + nền pha màu), chỉ đổi màu theo
   sắc thái. Trước đây khối này có thêm một vệt màu dày bên trái — một kiểu
   trang trí lạc lõng so với phần còn lại của trang. */
.alert {
  border: 1px solid var(--bad);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(255,122,107,.09), rgba(255,122,107,.03));
  padding: 1rem 1.1rem; font-size: .87rem; color: var(--fg-dim);
  text-align: left; width: 100%;
}
.alert b { display: block; color: var(--fg); margin-bottom: .25rem; }

/* ---------- 15. Modal / lightbox ---------- */
.ov { position: fixed; inset: 0; z-index: 100; display: none; place-items: center; padding: var(--gut); }
.ov.is-open { display: grid; }
.ov__bd { position: absolute; inset: 0; background: rgba(10,11,13,.86); backdrop-filter: blur(8px); }
.ov__box { position: relative; z-index: 1; max-width: 420px; width: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 2rem; text-align: center; }
.ov__box--vid { max-width: 400px; padding: 0; overflow: hidden; background: #000; }
.ov__box--vid video { width: 100%; max-height: 82vh; }
.ov__close {
  position: absolute; top: -14px; right: -14px; z-index: 2;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--raised); border: 1px solid var(--line);
  display: grid; place-items: center;
}
.ov__close:hover { border-color: var(--tung); color: var(--tung); }
.ov__tick { width: 66px; height: 66px; border-radius: 50%; background: rgba(110,231,168,.13); border: 1px solid var(--ok); display: grid; place-items: center; margin: 0 auto 1.2rem; color: var(--ok); }
.ov__cap { padding: .8rem 1rem; font-size: .82rem; color: var(--fg-dim); text-align: left; background: var(--surface); }

/* Banner báo chế độ demo. Chỉ hiện khi CONFIG.api còn rỗng — không phải
   giao diện bán hàng, nên để riêng và giữ tương phản cỡ chữ rõ ràng. */
.demobar {
  background: #3a2410;
  border-bottom: 1px solid var(--tung-deep);
  padding: .7rem var(--gut);
  text-align: center;
  color: var(--tung-hi);
}
.demobar b {
  display: block;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.demobar span { font-size: .95rem; }
.demobar code {
  font-family: var(--mono);
  font-size: .85em;
  background: rgba(0,0,0,.28);
  padding: .1em .35em;
  border-radius: 4px;
}

/* ---------- 16. Footer + sticky CTA ---------- */
.ft { border-top: 1px solid var(--line-soft); padding-block: 2.5rem 6rem; font-size: .85rem; color: var(--fg-faint); }
.ft__in { display: grid; gap: 1rem; }
.ft a:hover { color: var(--tung); }

.sticky {
  position: fixed; inset: auto 0 0 0; z-index: 55;
  background: rgba(19,21,25,.94); backdrop-filter: blur(14px);
  border-top: 1px solid var(--line);
  padding: .7rem var(--gut);
  display: flex; align-items: center; gap: 1rem;
}
.sticky__p { flex: 1; min-width: 0; }
.sticky__p b { font-family: var(--mono); color: var(--tung); font-size: 1rem; display: block; }
.sticky__p small { font-size: .68rem; color: var(--fg-faint); }
.sticky .btn { flex: none; padding: .8rem 1.2rem; }
@media (min-width: 900px) { .sticky { display: none; } .ft { padding-bottom: 2.5rem; } }

/* ---------- 17. Reveal ---------- */
.rv { opacity: 0; transform: translateY(22px); transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1); }
.rv.is-in { opacity: 1; transform: none; }

/* ---------- 18. Responsive ---------- */
@media (min-width: 700px) {
  .probs { grid-template-columns: repeat(3, 1fr); }
  .ft__in { grid-template-columns: 1fr auto; align-items: center; }
  .outgrid { grid-template-columns: repeat(3, 1fr); }
  .pay { grid-template-columns: 1fr; }
}
@media (min-width: 900px) {
  .outgrid--5 { grid-template-columns: repeat(5, 1fr); }
  .outgrid--4 { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 900px) {
  .hero__grid { grid-template-columns: 1.05fr .95fr; align-items: center; }
  .gvs { grid-template-columns: repeat(3, 1fr); }
  .gv { grid-template-rows: auto 1fr; }
  .buy { grid-template-columns: 1.1fr .9fr; }
  .pay { grid-template-columns: 2fr 3fr; }
  .pay__side { border-bottom: 0; border-right: 1px solid var(--line); }
  .ses { padding-left: 3.2rem; }
  .ses__body { grid-template-columns: 1.35fr 1fr; align-items: start; }
  .form { position: sticky; top: 84px; }
  .reel__stage { max-width: 340px; }
  .strip { max-width: 340px; }
}
@media (min-width: 1100px) {
  .reel__stage { max-width: 375px; }
  .strip { max-width: 375px; }
}

/* ---------- 19. Motion off ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .rv { opacity: 1; transform: none; }
}