/* Vạn Giới Bí Cảnh — trang game. Bảng màu theo bộ UI trong game: mực ngọc tối, ngọc bích, vàng kim, giấy kem, son. */
:root {
  --ink: #071a1d;
  --ink-2: #0c2629;
  --ink-3: #12353a;
  --jade: #2fc79a;
  --jade-deep: #138a6a;
  --gold: #f6c453;
  --gold-deep: #c98a1e;
  --paper: #f6eedb;
  --paper-ink: #2a1d14;
  --cinnabar: #c8402c;
  --text: #eef4ec;
  --dim: #a9c0b9;
  --line: rgba(246, 196, 83, .22);
  --radius: 18px;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: 16px; top: -60px; z-index: 50; padding: 10px 16px; background: var(--gold); color: var(--ink); border-radius: 10px; }
.skip-link:focus { top: 12px; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

/* ---------------- header ---------------- */
.top {
  position: absolute; inset: 0 0 auto 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px clamp(16px, 4vw, 48px);
}
.studio img { width: 92px; }
.top nav { display: flex; align-items: center; gap: clamp(10px, 2.4vw, 28px); font-weight: 600; font-size: 15px; }
.top nav a { text-decoration: none; text-shadow: 0 1px 6px rgba(0, 0, 0, .55); }
.top nav a:hover { color: var(--gold); }
.lang {
  font: inherit; font-weight: 700; font-size: 13px; letter-spacing: .06em; color: var(--ink);
  background: var(--gold); border: 0; border-radius: 999px; padding: 6px 12px; cursor: pointer;
}

/* ---------------- hero ---------------- */
.hero { position: relative; min-height: min(100svh, 920px); display: flex; align-items: center; overflow: hidden; isolation: isolate; }
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(180deg, rgba(7, 26, 29, .25) 0%, rgba(7, 26, 29, .15) 35%, rgba(7, 26, 29, .78) 78%, var(--ink) 100%),
    url("assets/bg.jpg") center 70% / cover no-repeat;
}
.hero-inner {
  width: min(1180px, 100%); margin: 0 auto;
  padding: 110px clamp(16px, 4vw, 48px) 64px;
  display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: clamp(28px, 5vw, 72px);
}
.logo { margin: 0 0 8px; }
.logo img { width: min(560px, 100%); filter: drop-shadow(0 10px 18px rgba(20, 10, 0, .45)); }
.tagline {
  margin: 0 0 20px; font-size: clamp(18px, 2.1vw, 22px); font-weight: 600; line-height: 1.5;
  text-shadow: 0 2px 10px rgba(0, 0, 0, .7);
}
.facts { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0 0 26px; padding: 0; }
.facts li {
  padding: 5px 13px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: rgba(7, 26, 29, .62); border: 1px solid var(--line); backdrop-filter: blur(6px);
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 54px;
  padding: 0 26px; border-radius: 14px; font-weight: 800; font-size: 16px; text-decoration: none;
  transition: transform .15s ease, filter .15s ease;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn-jade {
  color: #fff; background: linear-gradient(180deg, #3fe0ad, var(--jade-deep));
  border: 2px solid var(--gold); box-shadow: 0 6px 0 #0b5a45, 0 10px 24px rgba(0, 0, 0, .35);
  text-shadow: 0 1px 2px rgba(0, 0, 0, .45);
}
.btn-ghost { color: var(--text); background: rgba(7, 26, 29, .55); border: 1px solid rgba(255, 255, 255, .3); backdrop-filter: blur(6px); }
.btn.pending { opacity: .55; pointer-events: none; }
.soon { display: flex; align-items: center; gap: 10px; margin: 22px 0 0; color: var(--dim); font-size: 14px; font-weight: 600; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--jade); box-shadow: 0 0 0 4px rgba(47, 199, 154, .25); animation: pulse 2s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 9px rgba(47, 199, 154, 0); } }

.phone {
  position: relative; margin: 0 auto; width: min(340px, 100%); aspect-ratio: 9 / 16;
  border-radius: 34px; padding: 10px; background: linear-gradient(160deg, #3a2c12, #0c1d1f 40%, #3a2c12);
  border: 2px solid var(--gold); box-shadow: 0 30px 60px rgba(0, 0, 0, .55), 0 0 0 8px rgba(246, 196, 83, .08);
}
.phone video { width: 100%; height: 100%; object-fit: cover; border-radius: 25px; background: #000; display: block; }
.sound {
  position: absolute; left: 50%; bottom: -20px; transform: translateX(-50%);
  font: inherit; font-weight: 700; font-size: 14px; color: var(--ink); white-space: nowrap;
  background: var(--gold); border: 0; border-radius: 999px; padding: 9px 18px; cursor: pointer;
  box-shadow: 0 6px 16px rgba(0, 0, 0, .4);
}

/* ---------------- sections ---------------- */
section { scroll-margin-top: 20px; }
.sec-head { text-align: center; margin: 0 auto 36px; max-width: 720px; }
.eyebrow { margin: 0 0 8px; color: var(--gold); font-weight: 800; letter-spacing: .14em; text-transform: uppercase; font-size: 13px; }
.eyebrow.ink { color: var(--cinnabar); }
h2 { margin: 0; font-size: clamp(26px, 4vw, 40px); line-height: 1.2; font-weight: 900; letter-spacing: -.01em; }
h3 { margin: 14px 0 6px; font-size: 19px; font-weight: 800; color: var(--gold); }

.how { padding: 8px clamp(16px, 4vw, 48px) 72px; }
.steps { list-style: none; margin: 0 auto; padding: 0; max-width: 1080px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { display: grid; gap: 2px; padding: 20px 22px; border-radius: var(--radius); background: var(--ink-2); border: 1px solid var(--line); }
.steps b { color: var(--jade); font-size: 14px; letter-spacing: .1em; }
.steps strong { font-size: 18px; }
.steps span { color: var(--dim); font-size: 15px; }

.features { padding: 40px clamp(16px, 4vw, 48px) 90px; }
.grid { max-width: 1080px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
  padding: 24px; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--ink-3), var(--ink-2)); border: 1px solid var(--line);
}
.card p { margin: 0; color: var(--dim); }
.icons { display: flex; gap: 10px; }
.icons img {
  width: 56px; height: 56px; image-rendering: pixelated; padding: 6px; border-radius: 12px;
  background: rgba(0, 0, 0, .3); border: 1px solid rgba(246, 196, 83, .35);
}
.icons img.round { padding: 0; object-fit: cover; }

/* cốt truyện: tấm giấy kem chữ mực như trang Vạn Yêu Lục */
.story { padding: 20px clamp(16px, 4vw, 48px) 100px; }
.scroll {
  max-width: 860px; margin: 0 auto; padding: clamp(28px, 5vw, 56px);
  background: var(--paper); color: var(--paper-ink); border-radius: 22px;
  border: 3px solid #b88a3c; box-shadow: inset 0 0 0 6px #efe2c3, 0 24px 50px rgba(0, 0, 0, .45);
}
.scroll h2 { color: #3b1a10; margin-bottom: 16px; }
.scroll p { margin: 0 0 14px; font-size: 17px; }
.duel { display: grid; gap: 14px; margin-top: 26px; }
.line { display: flex; align-items: center; gap: 16px; padding: 14px 18px; border-radius: 16px; background: #0a2023; color: var(--text); }
.line img { width: 72px; height: 72px; border-radius: 12px; image-rendering: pixelated; flex: none; }
.line b { display: block; font-size: 15px; }
.line q { font-size: 17px; quotes: "“" "”"; }
.line.say-boss { border: 2px solid #b83a26; flex-direction: row-reverse; text-align: right; }
.line.say-boss b { color: #ff8a70; }
.line.say-boss img { image-rendering: pixelated; transform: scaleX(-1); }   /* sprite gốc quay phải: lật cho nhìn vào lời thoại */
.line.say-hero { border: 2px solid var(--gold); }
.line.say-hero b { color: var(--gold); }
.line.say-hero img { image-rendering: auto; }

.shots { padding: 0 0 100px; }
.strip {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(200px, 240px); gap: 16px;
  overflow-x: auto; padding: 6px clamp(16px, 4vw, 48px) 18px; scroll-snap-type: x mandatory;
  scrollbar-color: var(--gold-deep) transparent;
}
.strip figure { margin: 0; scroll-snap-align: center; }
.strip img { border-radius: 16px; border: 2px solid rgba(246, 196, 83, .45); box-shadow: 0 14px 30px rgba(0, 0, 0, .4); }
.strip figcaption { margin-top: 10px; text-align: center; font-weight: 700; color: var(--dim); font-size: 14px; }

.realms { padding: 0 clamp(16px, 4vw, 48px) 100px; }
.realm-list { list-style: none; margin: 0 auto; padding: 0; max-width: 1080px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.realm-list li {
  display: grid; gap: 4px; padding: 22px; border-radius: var(--radius);
  background: repeating-linear-gradient(135deg, var(--ink-2) 0 14px, #0a2124 14px 28px); border: 1px dashed rgba(255, 255, 255, .18);
  color: var(--dim);
}
.realm-list li.open { background: linear-gradient(160deg, #165545, var(--ink-2)); border: 2px solid var(--jade); color: var(--text); }
.realm-list strong { font-size: 24px; font-weight: 900; color: var(--text); }
.tag { justify-self: start; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; padding: 3px 10px; border-radius: 999px; background: rgba(255, 255, 255, .1); }
.open .tag { background: var(--jade); color: var(--ink); }

.join { padding: 0 clamp(16px, 4vw, 48px) 110px; }
.join-card {
  max-width: 980px; margin: 0 auto; display: flex; gap: 32px; align-items: center;
  padding: clamp(24px, 4vw, 44px); border-radius: 24px;
  background: radial-gradient(circle at 15% 20%, rgba(47, 199, 154, .25), transparent 55%), var(--ink-3);
  border: 2px solid var(--gold);
}
.join-card p { color: var(--dim); }
.app-icon { width: 128px; height: 128px; border-radius: 28px; flex: none; box-shadow: 0 12px 28px rgba(0, 0, 0, .45); }

.foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px;
  padding: 28px clamp(16px, 4vw, 48px); border-top: 1px solid var(--line); color: var(--dim); font-size: 14px;
}
.foot .studio img { width: 80px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; }
.foot-links a { text-decoration: none; }
.foot-links a:hover { color: var(--gold); }

/* ---------------- mobile ---------------- */
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; padding-top: 96px; }
  .facts, .cta-row, .soon { justify-content: center; }
  .logo img { margin: 0 auto; }
  .phone { width: min(300px, 82vw); margin-top: 8px; }
  .steps, .grid, .realm-list { grid-template-columns: 1fr; }
  .join-card { flex-direction: column; text-align: center; }
  .join-card .cta-row { justify-content: center; }
}
@media (max-width: 520px) {
  .top nav a { display: none; }
  .btn { width: 100%; }
  .line q { font-size: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dot { animation: none; }
  .btn { transition: none; }
}