/* ============================================================
   开元传世 · 游戏官网  样式表
   设计基调：深色 + 鎏金，简约大气，中国风仙侠
   ============================================================ */

:root {
  --bg:        #0b0d12;
  --bg-2:      #11141b;
  --surface:   #161a23;
  --surface-2: #1c212c;
  --gold:      #c9a86a;
  --gold-bright:#e6cd97;
  --gold-soft: rgba(201,168,106,.16);
  --text:      #eceef2;
  --muted:     #9aa1ad;
  --line:      rgba(201,168,106,.18);
  --line-soft: rgba(255,255,255,.07);
  --radius:    14px;
  --maxw:      1180px;
  --shadow:    0 18px 50px rgba(0,0,0,.45);
  --serif:     "Songti SC","STSong","SimSun","Noto Serif SC",serif;
  --sans:      "PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,
               BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

* { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior:smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width:100%; display:block; }
ul { list-style:none; }

.wrap { width:100%; max-width: var(--maxw); margin:0 auto; padding:0 24px; }

/* ----------------------------- 顶部导航 ----------------------------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  height: 70px; padding: 0 24px;
  background: rgba(11,13,18,.55);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.nav.scrolled {
  background: rgba(11,13,18,.92);
  border-bottom-color: var(--line);
}
.brand {
  display: flex; align-items: center; gap: 12px;
  color: var(--gold-bright);
}
.brand img { height: 36px; width: auto; display: block; filter: drop-shadow(0 2px 8px rgba(201,168,106,.25)); }
.brand .seal {
  width: 34px; height: 34px; border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(145deg, var(--gold), #8c6f3a);
  color: #1a1206; font-weight: 700; font-family: var(--serif);
  font-size: 18px; box-shadow: 0 6px 16px rgba(201,168,106,.35);
}
.hero-logo { height: clamp(120px, 24vw, 240px); width: auto; margin: 0 auto 12px; filter: drop-shadow(0 0 30px rgba(201,168,106,.45)); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  position: relative; font-size: 15px; color: var(--muted);
  transition: color .25s; letter-spacing: 1px;
}
.nav-links a::after {
  content:""; position:absolute; left:0; bottom:-8px; height:2px; width:0;
  background: var(--gold); transition: width .3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--gold-bright); }
.nav-links a.active::after, .nav-links a:hover::after { width:100%; }
.nav-cta {
  padding: 9px 20px; border-radius: 999px;
  background: linear-gradient(145deg, var(--gold), #a9853f);
  color: #1a1206 !important; font-weight: 600; letter-spacing: 1px;
  box-shadow: 0 8px 20px rgba(201,168,106,.3);
}
.nav-cta::after { display:none; }
.nav-toggle { display:none; background:none; border:0; color:var(--gold-bright); font-size:24px; cursor:pointer; }

/* ----------------------------- 按钮 ----------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 28px; border-radius: 999px; font-size: 15px;
  font-weight: 600; letter-spacing: 1px; cursor: pointer;
  transition: transform .2s, box-shadow .25s, background .25s; border:1px solid transparent;
}
.btn-gold {
  background: linear-gradient(145deg, var(--gold-bright), #b78f49);
  color: #1a1206; box-shadow: 0 10px 26px rgba(201,168,106,.35);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(201,168,106,.5); }
.btn-ghost { border-color: var(--line); color: var(--gold-bright); background: rgba(201,168,106,.05); }
.btn-ghost:hover { background: var(--gold-soft); transform: translateY(-2px); }
.btn svg { width:18px; height:18px; }

/* Hero 下载按钮压在深色背景图上，单独提高对比度（不影响下载页卡片） */
.hero-actions .btn { box-shadow: 0 10px 28px rgba(0,0,0,.45); }
.hero-actions .btn-ghost {
  background: #ffffff; color: #1a1206;
  border-color: rgba(255,255,255,.7);
  box-shadow: 0 10px 28px rgba(0,0,0,.45);
}
.hero-actions .btn-ghost:hover { background: #f3ecdb; transform: translateY(-2px); }

/* ----------------------------- Hero ----------------------------- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  transform: scale(1.08); animation: slowZoom 22s ease-in-out infinite alternate;
}
@keyframes slowZoom { from{ transform:scale(1.05);} to{ transform:scale(1.16);} }

/* 流动光照：暖金光斑缓慢漂移 + 呼吸，screen 混合叠加在暗背景上 */
.hero-glow {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  mix-blend-mode: screen;
  background:
    radial-gradient(38% 48% at 28% 34%, rgba(201,168,106,.40), transparent 70%),
    radial-gradient(34% 44% at 72% 30%, rgba(232,196,120,.30), transparent 72%),
    radial-gradient(50% 60% at 50% 80%, rgba(160,130,80,.18), transparent 75%);
  animation: glowFloat 16s ease-in-out infinite alternate;
}
@keyframes glowFloat {
  0%   { transform: translate(-5%, -3%) scale(1);    opacity: .65; }
  50%  { transform: translate(2%,  1%)  scale(1.08); opacity: 1;   }
  100% { transform: translate(7%,  5%)  scale(1.16); opacity: .85; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-bg, .hero-glow { animation: none; }
}
.hero::before {
  content:""; position:absolute; inset:0;
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(11,13,18,.2), rgba(11,13,18,.85)),
    linear-gradient(to bottom, rgba(11,13,18,.4), rgba(11,13,18,.95));
}
.hero::after {
  content:""; position:absolute; left:0; right:0; bottom:0; height:160px;
  background: linear-gradient(to top, var(--bg), transparent);
}
.hero-inner { position: relative; z-index: 2; padding: 90px 24px 0; }
.hero-tag {
  display:inline-block; font-size:13px; letter-spacing:6px; color: var(--gold);
  border:1px solid var(--line); padding:7px 18px; border-radius:999px;
  margin-bottom: 28px; background: rgba(201,168,106,.06);
}
.hero h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(56px, 11vw, 128px); line-height: 1;
  letter-spacing: 8px; color: #fff;
  text-shadow: 0 0 40px rgba(201,168,106,.4);
  background: linear-gradient(180deg, #fff 30%, var(--gold-bright));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-sub {
  margin: 22px auto 0; max-width: 620px; font-size: clamp(15px,2.4vw,18px);
  color: var(--muted); letter-spacing: 1px;
}
.hero-actions { margin-top: 44px; display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }
.scroll-hint {
  position:absolute; bottom: 30px; left:50%; transform:translateX(-50%);
  z-index:3; color: var(--muted); font-size: 12px; letter-spacing:3px;
  display:flex; flex-direction:column; align-items:center; gap:8px;
}
.scroll-hint span { width:1px; height:36px; background: linear-gradient(var(--gold),transparent); animation: drop 1.8s infinite; }
@keyframes drop { 0%{ opacity:0; transform:translateY(-10px);} 50%{opacity:1;} 100%{opacity:0; transform:translateY(10px);} }

/* ----------------------------- 通用区块 ----------------------------- */
.section { padding: 100px 0; position: relative; }
.section.alt { background: linear-gradient(180deg, var(--bg-2), var(--bg)); }
.section-head { text-align:center; margin-bottom: 56px; }
.section-head .kicker {
  color: var(--gold); letter-spacing: 5px; font-size: 13px; text-transform: uppercase;
}
.section-head h2 {
  font-family: var(--serif); font-size: clamp(28px,5vw,42px); margin-top: 12px;
  letter-spacing: 3px; color: var(--text);
}
.section-head p { color: var(--muted); margin-top: 14px; max-width: 620px; margin-inline:auto; }

/* 特性卡片 */
.features { display:grid; grid-template-columns: repeat(4,1fr); gap: 22px; }
.feature {
  background: var(--surface); border:1px solid var(--line-soft); border-radius: var(--radius);
  padding: 34px 26px; transition: transform .3s, border-color .3s, box-shadow .3s;
}
.feature:hover { transform: translateY(-6px); border-color: var(--line); box-shadow: var(--shadow); }
.feature .ico {
  width:54px; height:54px; border-radius:12px; display:grid; place-items:center;
  background: var(--gold-soft); color: var(--gold-bright); margin-bottom:18px;
}
.feature .ico svg { width:28px; height:28px; }
.feature h3 { font-family: var(--serif); font-size: 20px; letter-spacing:2px; margin-bottom:10px; }
.feature p { color: var(--muted); font-size: 14.5px; }

/* 世界观 / 简介 */
.intro { display:grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items:center; }
.intro-media { border-radius: var(--radius); overflow:hidden; border:1px solid var(--line); box-shadow: var(--shadow); }
.intro-media img { width:100%; height:100%; object-fit:cover; }
.intro h2 { font-family: var(--serif); font-size: clamp(26px,4vw,38px); letter-spacing:3px; margin-bottom:20px; }
.intro p { color: var(--muted); margin-bottom: 16px; }
.intro .stats { display:flex; gap: 36px; margin-top: 28px; }
.intro .stats .num { font-family: var(--serif); font-size: 34px; color: var(--gold-bright); }
.intro .stats .lbl { color: var(--muted); font-size: 13px; letter-spacing:1px; }

/* 最新动态 */
.news { display:grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.news-card {
  background: var(--surface); border:1px solid var(--line-soft); border-radius: var(--radius);
  padding: 26px; transition: border-color .3s, transform .3s;
}
.news-card:hover { border-color: var(--line); transform: translateY(-4px); }
.news-card .date { color: var(--gold); font-size: 13px; letter-spacing:1px; }
.news-card h3 { font-family: var(--serif); font-size:19px; margin:10px 0; letter-spacing:1px; }
.news-card p { color: var(--muted); font-size:14px; }
.news-card .tag {
  display:inline-block; margin-top:14px; font-size:12px; color: var(--gold-bright);
  border:1px solid var(--line); padding:3px 12px; border-radius:999px;
}

/* 展示预览 */
.showcase-tease { position:relative; border-radius: var(--radius); overflow:hidden; border:1px solid var(--line); }
.showcase-tease img { width:100%; height:480px; object-fit:cover; }
.showcase-tease .ov {
  position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:18px; background: linear-gradient(to top, rgba(11,13,18,.85), rgba(11,13,18,.25));
  text-align:center; padding: 20px;
}
.showcase-tease .ov h3 { font-family:var(--serif); font-size: clamp(26px,4vw,40px); letter-spacing:4px; }

/* CTA 横幅 */
.cta-banner {
  text-align:center; padding: 80px 24px; border-radius: var(--radius);
  background:
    radial-gradient(80% 120% at 50% 0%, rgba(201,168,106,.16), transparent),
    var(--surface);
  border:1px solid var(--line);
}
.cta-banner h2 { font-family:var(--serif); font-size: clamp(26px,5vw,40px); letter-spacing:3px; }
.cta-banner p { color: var(--muted); margin: 14px 0 30px; }

/* ----------------------------- 下载页 ----------------------------- */
.dl-hero {
  position: relative; padding: 150px 0 80px; text-align:center; overflow:hidden;
  border-bottom: 1px solid var(--line);
}
.dl-hero .hero-bg { opacity:.5; }
.dl-hero::before {
  content:""; position:absolute; inset:0;
  background: linear-gradient(to bottom, rgba(11,13,18,.6), rgba(11,13,18,.95));
}
.dl-hero-inner { position:relative; z-index:2; }
.dl-hero .plat {
  display:inline-flex; align-items:center; gap:12px; margin-bottom:18px;
  color: var(--gold-bright); border:1px solid var(--line); padding:8px 18px; border-radius:999px;
  letter-spacing:2px;
}
.dl-hero h1 { font-family:var(--serif); font-size: clamp(34px,6vw,56px); letter-spacing:4px; }
.dl-hero p { color: var(--muted); margin-top:14px; }
.dl-grid { display:flex; justify-content:center; }
.dl-card {
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  padding: 40px; box-shadow: var(--shadow); width:100%; max-width: 600px; margin:0 auto;
}
.dl-card .big-btn {
  width:100%; justify-content:center; padding:18px; font-size:17px;
}
.dl-meta { margin-top: 22px; display:flex; flex-direction:column; gap:12px; }
.dl-meta .row { display:flex; justify-content:space-between; border-bottom:1px dashed var(--line-soft); padding-bottom:10px; }
.dl-meta .row span:first-child { color: var(--muted); }
.qr {
  background:#fff; border-radius: var(--radius); padding: 22px; text-align:center;
  box-shadow: var(--shadow);
}
.qr svg { width: 200px; height:200px; }
.qr .cap { color:#333; font-size:13px; margin-top:12px; letter-spacing:1px; }
.dl-steps { counter-reset: step; margin-top: 10px; }
.dl-steps li { position:relative; padding: 0 0 22px 46px; }
.dl-steps li::before {
  counter-increment: step; content: counter(step);
  position:absolute; left:0; top:0; width:30px; height:30px; border-radius:50%;
  background: var(--gold-soft); color: var(--gold-bright); display:grid; place-items:center;
  font-family: var(--serif); font-weight:700;
}
.dl-steps h4 { font-size:16px; letter-spacing:1px; margin-bottom:4px; }
.dl-steps p { color: var(--muted); font-size:14px; }

/* 配置要求 */
.spec-table { width:100%; border-collapse: collapse; margin-top: 10px; }
.spec-table th, .spec-table td { text-align:left; padding: 16px 18px; border-bottom:1px solid var(--line-soft); }
.spec-table th { color: var(--gold); font-weight:600; width: 160px; letter-spacing:1px; }
.spec-table td { color: var(--text); }
.spec-table tr:hover td { background: var(--surface); }

/* ----------------------------- 精彩展示页 ----------------------------- */
.filter-bar { display:flex; gap:12px; justify-content:center; flex-wrap:wrap; margin-bottom:40px; }
.filter-bar button {
  background: var(--surface); border:1px solid var(--line-soft); color: var(--muted);
  padding: 9px 22px; border-radius:999px; cursor:pointer; letter-spacing:1px; transition: all .25s;
  font-family: var(--sans); font-size:14px;
}
.filter-bar button.active, .filter-bar button:hover { color:#1a1206; background: linear-gradient(145deg,var(--gold-bright),#b78f49); border-color:transparent; }
.gallery { display:grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.gallery figure {
  position:relative; border-radius: var(--radius); overflow:hidden; cursor:pointer;
  border:1px solid var(--line-soft); aspect-ratio: 4/3;
}
.gallery img { width:100%; height:100%; object-fit:cover; transition: transform .5s; }
.gallery figure:hover img { transform: scale(1.08); }
.gallery figcaption {
  position:absolute; left:0; right:0; bottom:0; padding: 18px 16px 14px;
  background: linear-gradient(to top, rgba(11,13,18,.92), transparent);
  font-family: var(--serif); letter-spacing:2px; font-size:16px;
  transform: translateY(8px); opacity:.0; transition: .3s;
}
.gallery figure:hover figcaption { transform: translateY(0); opacity:1; }

/* 灯箱 */
.lightbox {
  position: fixed; inset:0; z-index: 100; display:none;
  background: rgba(5,6,9,.94); align-items:center; justify-content:center; padding: 40px;
}
.lightbox.open { display:flex; }
.lightbox img { max-width: 90vw; max-height: 84vh; border-radius: 10px; box-shadow: var(--shadow); }
.lightbox .close {
  position:absolute; top:24px; right:30px; font-size: 34px; color: var(--text); cursor:pointer;
  background:none; border:0;
}
.lightbox .cap { position:absolute; bottom: 28px; left:0; right:0; text-align:center; color: var(--gold-bright); font-family:var(--serif); letter-spacing:3px; }

/* ----------------------------- 页脚 ----------------------------- */
.footer { background: var(--bg-2); border-top:1px solid var(--line); padding: 60px 0 30px; }
.footer-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.footer .brand { margin-bottom: 16px; }
.footer p { color: var(--muted); font-size:14px; max-width: 320px; }
.footer h4 { font-family:var(--serif); letter-spacing:2px; margin-bottom:16px; color: var(--gold-bright); font-size:16px; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--muted); font-size:14px; transition: color .2s; }
.footer ul a:hover { color: var(--gold-bright); }
.footer-bottom {
  margin-top: 44px; padding-top: 22px; border-top:1px solid var(--line-soft);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  color: var(--muted); font-size:13px;
}
.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--gold-bright); }

/* 入场动画 */
.reveal { opacity:0; transform: translateY(28px); transition: opacity .7s, transform .7s; }
.reveal.in { opacity:1; transform:none; }

/* ----------------------------- 响应式 ----------------------------- */
@media (max-width: 920px) {
  .features, .news, .gallery { grid-template-columns: repeat(2,1fr); }
  .intro, .dl-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav-links {
    position: fixed; inset: 70px 0 auto 0; flex-direction: column; gap:0;
    background: rgba(11,13,18,.97); padding: 12px 0; border-bottom:1px solid var(--line);
    transform: translateY(-120%); transition: transform .35s; align-items: stretch;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 24px; }
  .nav-links a::after { display:none; }
  .nav-toggle { display:block; }
  .features, .news, .gallery { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 70px 0; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}