/* ============ GenshinCos — celestial theme ============ */
:root {
  --bg: #0a0f24;
  --bg-2: #101736;
  --card: rgba(255, 255, 255, 0.045);
  --card-border: rgba(255, 255, 255, 0.09);
  --gold: #d9b45b;
  --gold-2: #f2d992;
  --blue: #7db4ff;
  --text: #eef1ff;
  --muted: #a9b2d8;
  --tg: #2aabee;
  --radius: 18px;
  --font-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
html[lang="zh-CN"] { --font-display: "Noto Serif SC", "Cormorant Garamond", serif; }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
/* starfield + aurora glows */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,.8) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 34% 8%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 56% 30%, rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 74% 12%, rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 88% 38%, rgba(255,255,255,.75) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 22% 58%, rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 64% 66%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 42% 84%, rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 82% 78%, rgba(255,255,255,.65) 50%, transparent 51%),
    var(--bg);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(52% 38% at 82% -4%, rgba(96, 142, 255, 0.20), transparent 70%),
    radial-gradient(46% 36% at 8% 22%, rgba(217, 180, 91, 0.10), transparent 70%),
    radial-gradient(60% 42% at 50% 108%, rgba(120, 90, 255, 0.14), transparent 70%);
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- nav ---------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(10, 15, 36, 0.55);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.site-nav.scrolled { border-bottom-color: rgba(255,255,255,.08); background: rgba(10, 15, 36, 0.85); }
.nav-inner { display: flex; align-items: center; gap: 26px; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; color: var(--text); letter-spacing: .5px; }
.brand svg { width: 26px; height: 26px; }
.brand em { font-style: normal; color: var(--gold); }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--muted); font-size: .95rem; transition: color .2s; }
.nav-links a:hover { color: var(--gold-2); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch { display: flex; border: 1px solid var(--card-border); border-radius: 999px; overflow: hidden; font-size: .82rem; }
.lang-switch a { padding: 4px 12px; color: var(--muted); }
.lang-switch a.active { background: rgba(217,180,91,.16); color: var(--gold-2); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: 1rem; color: var(--text);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn svg { width: 19px; height: 19px; flex: none; }
.btn-gold {
  background: linear-gradient(135deg, #f2d992, #cfa53f);
  color: #241a04;
  box-shadow: 0 8px 26px rgba(217, 180, 91, .28);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(217, 180, 91, .4); }
.btn-tg { background: linear-gradient(135deg, #37b6f6, #1d94d8); color: #fff; box-shadow: 0 8px 26px rgba(42, 171, 238, .3); }
.btn-tg:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(42, 171, 238, .42); }
.btn-ghost { border-color: rgba(255,255,255,.18); color: var(--text); background: rgba(255,255,255,.03); }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-2); }
.btn-sm { padding: 8px 18px; font-size: .88rem; }

/* ---------- hero ---------- */
.hero { padding: 150px 0 90px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .85rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--gold-2); border: 1px solid rgba(217,180,91,.35);
  padding: 6px 16px; border-radius: 999px; background: rgba(217,180,91,.08);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.2vw, 4rem);
  line-height: 1.16; margin: 22px 0 18px; font-weight: 700;
}
.hero h1 .grad {
  background: linear-gradient(120deg, #f6e3a8, #d9b45b 45%, #9ec4ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { color: var(--muted); font-size: 1.08rem; max-width: 34em; }
.hero .lead strong { color: var(--text); font-weight: 600; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .86rem; color: var(--muted);
  border: 1px solid var(--card-border); background: var(--card);
  padding: 7px 14px; border-radius: 999px;
}
.chip svg { width: 15px; height: 15px; color: var(--gold); }

/* hero art: stacked photos */
.hero-art { position: relative; justify-self: center; width: min(430px, 100%); }
.hero-art .ph {
  position: relative; border-radius: 22px; overflow: hidden;
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 30px 70px rgba(0,0,0,.55);
}
.hero-art .ph img { width: 100%; height: auto; }
.hero-art .ph-back {
  position: absolute; inset: 0; transform: rotate(7deg) translate(26px, 14px) scale(.96);
  opacity: .5; z-index: -1; filter: saturate(.85) brightness(.8);
}
.hero-art::before {
  content: ""; position: absolute; inset: -12% -14%; z-index: -2;
  background: radial-gradient(50% 50% at 50% 45%, rgba(217,180,91,.22), transparent 70%);
  filter: blur(6px);
}
.float-star { position: absolute; color: var(--gold-2); animation: floaty 5s ease-in-out infinite; }
.float-star.s1 { width: 34px; top: -18px; right: 8%; }
.float-star.s2 { width: 22px; bottom: 12%; left: -14px; animation-delay: 1.6s; color: var(--blue); }
.float-star.s3 { width: 16px; top: 38%; right: -12px; animation-delay: 2.8s; }
@keyframes floaty { 0%,100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-12px) rotate(12deg); } }

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.sec-head .eyebrow { margin-bottom: 14px; }
.sec-head h2 { font-family: var(--font-display); font-size: clamp(1.9rem, 3.6vw, 2.7rem); font-weight: 700; }
.sec-head p { color: var(--muted); margin-top: 12px; }

/* ---------- gallery ---------- */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.gcard {
  position: relative; border-radius: var(--radius); overflow: hidden; cursor: zoom-in;
  border: 1px solid var(--card-border); background: var(--card);
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.gcard:hover { transform: translateY(-6px); border-color: rgba(217,180,91,.45); box-shadow: 0 22px 44px rgba(0,0,0,.45); }
.gcard img { width: 100%; aspect-ratio: 9/16; object-fit: cover; transition: transform .5s; }
.gcard:hover img { transform: scale(1.05); }
.gcard .info {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 16px 14px;
  background: linear-gradient(transparent, rgba(5, 8, 22, .92));
}
.gcard .info h3 { font-size: 1.06rem; font-weight: 600; }
.gcard .info h3 span { color: var(--muted); font-weight: 400; font-size: .85rem; margin-left: 6px; }
.gcard .tags { display: flex; gap: 6px; margin-top: 7px; flex-wrap: wrap; }
.tag { font-size: .72rem; padding: 3px 10px; border-radius: 999px; background: rgba(255,255,255,.1); color: #cfd7f5; border: 1px solid rgba(255,255,255,.12); }
.tag.elem { background: rgba(217,180,91,.16); color: var(--gold-2); border-color: rgba(217,180,91,.3); }

/* ---------- lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 100; display: none;
  align-items: center; justify-content: center;
  background: rgba(4, 6, 16, .9); backdrop-filter: blur(10px);
}
.lightbox.open { display: flex; }
.lb-stage { position: relative; max-width: min(92vw, 640px); }
.lb-stage img { max-height: 82vh; width: auto; max-width: 100%; margin: 0 auto; border-radius: 14px; box-shadow: 0 30px 90px rgba(0,0,0,.7); }
.lb-cap { text-align: center; color: var(--muted); margin-top: 14px; font-size: .95rem; }
.lb-cap b { color: var(--text); }
.lb-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.07);
  color: var(--text); font-size: 1.3rem; cursor: pointer; line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
.lb-btn:hover { background: rgba(217,180,91,.25); }
.lb-prev { left: -64px; } .lb-next { right: -64px; }
.lb-close { position: absolute; top: 18px; right: 22px; }
.lb-cta { display: block; margin: 12px auto 0; }

/* ---------- channel ---------- */
.channel-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.feature-list { list-style: none; margin: 26px 0 32px; display: grid; gap: 16px; }
.feature-list li { display: flex; gap: 14px; align-items: flex-start; }
.feature-list .ic {
  flex: none; width: 42px; height: 42px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(217,180,91,.12); border: 1px solid rgba(217,180,91,.3); color: var(--gold-2);
}
.feature-list .ic svg { width: 20px; height: 20px; }
.feature-list b { display: block; font-size: 1.02rem; }
.feature-list p { color: var(--muted); font-size: .92rem; margin-top: 2px; }
.qr-card {
  justify-self: center; text-align: center; width: min(340px, 100%);
  background: linear-gradient(160deg, rgba(255,255,255,.08), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.14); border-radius: 26px; padding: 30px 26px;
  box-shadow: 0 26px 60px rgba(0,0,0,.45);
}
.qr-card .qr { background: #fff; padding: 14px; border-radius: 18px; width: 200px; margin: 18px auto; }
.qr-card .handle { font-family: var(--font-display); font-size: 1.3rem; color: var(--gold-2); font-weight: 700; }
.qr-card p { color: var(--muted); font-size: .9rem; margin-top: 6px; }

/* ---------- faq ---------- */
.faq-list { max-width: 780px; margin: 0 auto; display: grid; gap: 14px; }
.faq-list details {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 14px; padding: 18px 22px;
}
.faq-list summary {
  cursor: pointer; font-weight: 600; font-size: 1.02rem; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; color: var(--gold); font-size: 1.4rem; font-weight: 400; flex: none; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { color: var(--muted); margin-top: 12px; font-size: .95rem; }
.faq-list details a { color: var(--gold-2); }

/* ---------- about / footer ---------- */
.about { max-width: 820px; margin: 0 auto; text-align: center; color: var(--muted); font-size: .96rem; }
.about b { color: var(--text); }
footer { border-top: 1px solid rgba(255,255,255,.08); padding: 40px 0 90px; margin-top: 40px; }
.foot-inner { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between; color: var(--muted); font-size: .88rem; }
.foot-inner a { color: var(--muted); }
.foot-inner a:hover { color: var(--gold-2); }
.disclaimer { text-align: center; color: rgba(169,178,216,.6); font-size: .8rem; margin-top: 18px; line-height: 1.8; }

/* ---------- floating TG button ---------- */
.fab {
  position: fixed; right: 20px; bottom: 20px; z-index: 70;
  display: inline-flex; align-items: center; gap: 9px;
  background: linear-gradient(135deg, #37b6f6, #1d94d8); color: #fff;
  padding: 13px 22px; border-radius: 999px; font-weight: 600; font-size: .95rem;
  box-shadow: 0 12px 32px rgba(42,171,238,.45);
  transition: transform .2s, box-shadow .2s;
}
.fab:hover { transform: translateY(-3px) scale(1.03); }
.fab svg { width: 20px; height: 20px; }

/* ---------- lang hint banner ---------- */
.lang-banner {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 24px; z-index: 80;
  display: none; align-items: center; gap: 14px;
  background: rgba(16, 23, 54, .96); border: 1px solid rgba(217,180,91,.4);
  padding: 12px 20px; border-radius: 14px; box-shadow: 0 16px 40px rgba(0,0,0,.5);
  font-size: .92rem; max-width: 92vw;
}
.lang-banner.show { display: flex; }
.lang-banner a { color: var(--gold-2); font-weight: 600; white-space: nowrap; }
.lang-banner button { background: none; border: none; color: var(--muted); font-size: 1.1rem; cursor: pointer; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero { padding: 126px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-art { width: min(360px, 86%); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .channel-grid { grid-template-columns: 1fr; gap: 40px; }
  .lb-prev { left: 8px; } .lb-next { right: 8px; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .section { padding: 60px 0; }
  .hero-ctas .btn { flex: 1 1 auto; justify-content: center; }
  .fab span { display: none; }
  .fab { padding: 14px; }
  .foot-inner { justify-content: center; text-align: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}