:root {
  --paper: #f7f3ea; --card: #fffdf8; --ink: #17202e; --muted: #5d6675; --line: #e3dccb;
  --seal: #d1342b; --seal-ink: #fff; --jade: #1f7a5c; --wash: #efe8d8;
  --display: "Be Vietnam Pro", "Segoe UI", system-ui, sans-serif;
}
/* Mỗi mùa chỉ đổi vài màu chủ đạo; bố cục giữ nguyên */
[data-season=tet] { --seal: #c8102e; --wash: #fbe9c6; --jade: #b7791f; }
[data-season=he] { --seal: #0b76b8; --wash: #dff1fb; --paper: #f4f8fa; --line: #d6e3ea; }
[data-season=tuu-truong] { --seal: #1f7a5c; --wash: #e0efe2; --jade: #b45309; }
[data-season=noel] { --seal: #b3202a; --wash: #e3eee6; --jade: #14613f; }
[data-season=sale] {
  --paper: #12131a; --card: #1b1d27; --ink: #f3f1ea; --muted: #a5a9b8; --line: #2c2f3d;
  --seal: #ff3d6e; --wash: #1f2130; --jade: #22d3ee;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--display); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img, svg { max-width: 100%; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { line-height: 1.12; letter-spacing: -0.025em; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--seal); margin: 0 0 12px; }
.lead { color: var(--muted); font-size: 19px; max-width: 58ch; }
:is(a, button, summary):focus-visible { outline: 2px solid var(--seal); outline-offset: 3px; border-radius: 6px; }

/* Thanh mùa + đầu trang */
#season-bar { background: var(--seal); color: var(--seal-ink); text-align: center; padding: 9px 16px; font-size: 15px; font-weight: 600; }
.top { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; text-decoration: none; letter-spacing: -0.02em; white-space: nowrap; }
.seal {
  width: 30px; height: 30px; flex: none; border-radius: 7px; border: 2.5px solid var(--seal); color: var(--seal);
  display: grid; place-items: center; font-size: 17px; font-weight: 800; line-height: 1; transform: rotate(-8deg);
}
.brand b { color: var(--seal); font-weight: 800; }
.top nav { display: flex; gap: 22px; margin-left: auto; font-size: 15px; font-weight: 600; }
.top nav a { text-decoration: none; color: var(--muted); }
.top nav a:hover { color: var(--ink); }
.btn {
  display: inline-flex; align-items: center; gap: 8px; background: var(--seal); color: var(--seal-ink); text-decoration: none;
  font-weight: 700; padding: 13px 24px; border-radius: 12px; border: 0; font-size: 17px; cursor: pointer;
  box-shadow: 0 6px 0 color-mix(in srgb, var(--seal) 65%, #000); transition: transform .12s, box-shadow .12s;
}
.btn:hover { transform: translateY(2px); box-shadow: 0 4px 0 color-mix(in srgb, var(--seal) 65%, #000); }
.btn:active { transform: translateY(6px); box-shadow: none; }
.btn.small { padding: 9px 16px; font-size: 15px; box-shadow: 0 4px 0 color-mix(in srgb, var(--seal) 65%, #000); }
.btn.ghost { background: none; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--line); }
.btn.ghost:hover { transform: none; box-shadow: inset 0 0 0 1.5px var(--ink); }

/* Phần mở đầu */
.hero { position: relative; overflow: hidden; background: linear-gradient(180deg, var(--wash), var(--paper)); }
#fx { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 56px; align-items: center; padding-top: 72px; padding-bottom: 84px; }
.hero h1 { font-size: clamp(36px, 5.6vw, 62px); font-weight: 800; }
.hero h1 em { font-style: normal; color: var(--seal); }
.hero .lead { margin: 20px 0 30px; }
.cta { display: flex; flex-wrap: wrap; gap: 14px 20px; align-items: center; }
.cta small { color: var(--muted); font-size: 14px; }
.facts { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 0; margin: 30px 0 0; font-size: 15px; font-weight: 600; }
.facts li::before { content: "✓"; color: var(--jade); margin-right: 7px; font-weight: 800; }

/* Minh hoạ: ba việc đang chạy trên "bàn làm việc" */
.demo { display: grid; gap: 14px; perspective: 900px; }
.job {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; position: relative;
  box-shadow: 0 18px 40px -22px #0006; display: grid; gap: 9px;
}
.job:nth-child(1) { transform: rotate(-1.6deg); }
.job:nth-child(2) { transform: rotate(1.1deg) translateX(18px); }
.job:nth-child(3) { transform: rotate(-.6deg) translateX(-6px); }
.job .row { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 600; }
.job .row span:last-child { margin-left: auto; color: var(--muted); font-weight: 500; font-variant-numeric: tabular-nums; }
.fmt { display: inline-block; padding: 2px 8px; border-radius: 6px; color: #fff; font: 800 12px/1.5 var(--display); letter-spacing: .03em; }
.meter { height: 8px; border-radius: 99px; background: var(--wash); overflow: hidden; }
.meter i { display: block; height: 100%; width: 100%; border-radius: 99px; background: var(--jade); transform-origin: left; animation: fill 6s cubic-bezier(.3, .7, .2, 1) infinite; }
.job:nth-child(2) .meter i { animation-delay: .9s; }
.job:nth-child(3) .meter i { animation-delay: 1.8s; }
.stamp {
  position: absolute; right: 14px; top: -12px; padding: 3px 10px; border: 2.5px solid var(--seal); color: var(--seal); border-radius: 7px;
  font-size: 12px; font-weight: 800; letter-spacing: .1em; background: var(--card); transform: rotate(7deg); animation: stamp 6s infinite;
}
.job:nth-child(2) .stamp { animation-delay: .9s; }
.job:nth-child(3) .stamp { animation-delay: 1.8s; }
@keyframes fill { 0% { transform: scaleX(0); } 45%, 100% { transform: scaleX(1); } }
@keyframes stamp { 0%, 42% { opacity: 0; transform: rotate(7deg) scale(1.9); } 50%, 100% { opacity: 1; transform: rotate(7deg) scale(1); } }

/* Dải số liệu */
.strip { border-block: 1px solid var(--line); background: var(--card); }
.strip .wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding-block: 26px; text-align: center; }
.strip b { display: block; font-size: 34px; font-weight: 800; letter-spacing: -0.03em; color: var(--seal); line-height: 1.1; }
.strip span { color: var(--muted); font-size: 15px; }

section.block { padding: 88px 0; }
.block > .wrap > header { margin-bottom: 40px; }
.block > .wrap > header .lead { margin: 14px 0 0; }

/* Lưới công cụ */
.group { margin-top: 30px; }
.group h3 { font-size: 15px; font-weight: 700; color: var(--muted); margin-bottom: 12px; letter-spacing: 0; }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(176px, 1fr)); gap: 10px; }
a.tile { text-decoration: none; }
.tile {
  background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 14px; display: grid; gap: 8px; align-content: start;
  font-size: 15px; font-weight: 600; transition: transform .15s, border-color .15s, box-shadow .15s;
}
.tile:hover { transform: translateY(-3px) rotate(-.6deg); border-color: var(--seal); box-shadow: 0 12px 24px -16px #0007; }
.tile .tags { display: flex; gap: 6px; align-items: center; color: var(--seal); font-weight: 800; font-size: 13px; }

/* Riêng tư: so sánh hai cột */
.privacy { background: var(--ink); color: var(--paper); }
[data-season=sale] .privacy { background: #0b0c11; }
.privacy .eyebrow { color: #ffb4ab; }
.privacy .lead { color: #b9c0cc; }
.ticket {
  display: grid; justify-items: start; gap: 4px; padding: 26px 30px; margin-bottom: 18px; border-radius: 18px; position: relative;
  background: var(--seal); color: var(--seal-ink); overflow: hidden;
}
.ticket::before, .ticket::after {  /* hai vết khuyết như vé xé */
  content: ""; position: absolute; top: 50%; width: 28px; height: 28px; margin-top: -14px; border-radius: 50%; background: var(--ink);
}
[data-season=sale] .ticket::before, [data-season=sale] .ticket::after { background: #0b0c11; }
.ticket::before { left: -14px; }
.ticket::after { right: -14px; }
.ticket b { font-size: clamp(40px, 7vw, 64px); font-weight: 800; letter-spacing: -0.03em; line-height: 1; }
.ticket span { font-size: 19px; font-weight: 600; }
.ticket small { opacity: .85; font-size: 15px; margin-top: 6px; }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.compare > div { border-radius: 18px; padding: 26px; border: 1px solid #ffffff22; }
.compare .ours { background: var(--paper); color: var(--ink); border-color: transparent; }
[data-season=sale] .compare .ours { background: var(--card); }
.compare h3 { font-size: 20px; margin-bottom: 14px; }
.compare ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.compare li { padding-left: 26px; position: relative; }
.compare li::before { content: "✕"; position: absolute; left: 0; color: #ff8a80; font-weight: 800; }
.compare .ours li::before { content: "✓"; color: var(--jade); }

/* Ba bước */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding: 0; margin: 0; list-style: none; }
.steps li { counter-increment: step; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; }
.steps li::before {
  content: counter(step); display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; margin-bottom: 16px;
  border: 2.5px solid var(--seal); color: var(--seal); font-weight: 800; font-size: 18px; transform: rotate(-6deg);
}
.steps h3 { font-size: 20px; margin-bottom: 8px; }
.steps p { margin: 0; color: var(--muted); }

/* Câu hỏi thường gặp */
.faq { max-width: 780px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; font-size: 18px; padding: 18px 34px 18px 0; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 14px; font-size: 26px; font-weight: 400; color: var(--seal); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0 0 18px; color: var(--muted); max-width: 66ch; }

.final { text-align: center; background: linear-gradient(180deg, var(--paper), var(--wash)); }
.final h2 { font-size: clamp(30px, 5vw, 48px); }
.final .lead { margin: 16px auto 30px; }
.final .cta { justify-content: center; }

footer { border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--muted); font-size: 15px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 26px; align-items: center; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); text-decoration: underline; }
footer .grow { flex: 1; }

/* Trang chữ (chính sách, điều khoản, liên hệ, cảm ơn) */
.doc { max-width: 760px; padding-block: 64px 96px; }
.doc h1 { font-size: clamp(32px, 5vw, 46px); font-weight: 800; margin-bottom: 10px; }
.doc h2 { font-size: 24px; margin: 38px 0 10px; }
.doc p, .doc li { color: color-mix(in srgb, var(--ink) 82%, var(--paper)); }
.doc .note { background: var(--wash); border-left: 4px solid var(--seal); padding: 14px 18px; border-radius: 0 10px 10px 0; }
.thanks { text-align: center; }
.thanks .big-seal { width: 96px; height: 96px; margin: 0 auto 26px; border: 5px solid var(--seal); color: var(--seal); border-radius: 22px; display: grid; place-items: center; font-size: 44px; font-weight: 800; transform: rotate(-8deg); animation: pop .5s cubic-bezier(.2, 1.6, .4, 1) both; }
@keyframes pop { from { transform: rotate(-8deg) scale(2.2); opacity: 0; } }

/* Thanh cookie */
#cookie {
  position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 40; max-width: 720px; margin: 0 auto; background: var(--card); color: var(--ink);
  border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; box-shadow: 0 20px 50px -20px #0008;
  display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; font-size: 15px;
}
#cookie p { margin: 0; flex: 1 1 300px; }
#cookie[hidden] { display: none; }

/* Hiện dần khi cuộn tới */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s, transform .6s cubic-bezier(.2, .7, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.tiles .reveal:nth-child(3n+2) { transition-delay: .06s; }
.tiles .reveal:nth-child(3n) { transition-delay: .12s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .meter i, .stamp, .thanks .big-seal { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .tile, .btn { transition: none; }
}
@media (max-width: 880px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 44px; padding-top: 48px; padding-bottom: 60px; }
  .top nav { display: none; }
  .top .btn { margin-left: auto; }
  .strip .wrap { grid-template-columns: repeat(2, 1fr); }
  .compare, .steps { grid-template-columns: 1fr; }
  section.block { padding: 64px 0; }
  .job:nth-child(2) { transform: rotate(1.1deg); }
}
@media (max-width: 520px) {
  .wrap { padding: 0 16px; }
  body { font-size: 16px; }
  .tiles { grid-template-columns: repeat(2, 1fr); }
}