/* ============================================================
   腾龙游戏官方网站 · 单页静态站点样式
   设计语言：深空蓝紫 + 青蓝高光，大留白、强层级、电影感
   ============================================================ */

:root{
  --bg:#070a1c;
  --bg-2:#0b1130;
  --panel:rgba(255,255,255,.04);
  --panel-line:rgba(255,255,255,.10);
  --txt:#eef1ff;
  --txt-dim:#a8b0d0;
  --cyan:#5ee0ff;
  --blue:#6f7bff;
  --purple:#a06bff;
  --gold:#ffcf7a;
  --radius:18px;
  --max:1200px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"Alibaba PuHuiTi 2.0","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;object-fit:cover}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

.container{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- 按钮（首页横幅居中双悬浮按钮，强突出） ---------- */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:18px 40px;border-radius:999px;font-size:18px;font-weight:700;letter-spacing:.5px;
  cursor:pointer;border:0;z-index:2;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
  will-change:transform;
}
.btn-primary{
  color:#06121f;
  background:linear-gradient(120deg,#5ee0ff 0%,#7bffd4 55%,#a06bff 100%);
  box-shadow:0 18px 40px -12px rgba(94,224,255,.75),0 0 0 1px rgba(255,255,255,.25) inset;
}
.btn-primary .btn-glow{
  position:absolute;inset:-3px;border-radius:999px;z-index:-1;
  background:linear-gradient(120deg,#5ee0ff,#a06bff,#ffcf7a);
  filter:blur(14px);opacity:.65;
  animation:glow 3.2s ease-in-out infinite alternate;
}
@keyframes glow{from{opacity:.4;transform:scale(.97)}to{opacity:.85;transform:scale(1.04)}}
.btn-primary:hover{transform:translateY(-4px) scale(1.03)}
.btn-primary:hover .btn-glow{opacity:1}

.btn-ghost{
  color:#fff;
  background:rgba(255,255,255,.06);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  box-shadow:0 0 0 1.5px rgba(255,255,255,.28) inset,0 18px 40px -20px rgba(0,0,0,.9);
}
.btn-ghost:hover{transform:translateY(-4px);background:rgba(255,255,255,.12);box-shadow:0 0 0 1.5px rgba(94,224,255,.7) inset}

.btn-block{width:100%}
@media (max-width:560px){
  .btn{padding:15px 28px;font-size:16px;gap:8px}
}

/* ---------- 头部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto;z-index:100;
  background:rgba(7,10,28,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s,border-bottom .3s,background .3s;
}
.site-header.is-stuck{border-bottom-color:rgba(255,255,255,.08);background:rgba(7,10,28,.9)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px;letter-spacing:.5px;white-space:nowrap}
.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:rgba(94,224,255,.08)}
.brand-en{display:block;font-size:10px;font-weight:600;letter-spacing:2px;color:var(--txt-dim);margin-top:-2px}
.site-nav{display:flex;gap:6px;margin-left:auto}
.site-nav a{
  padding:9px 14px;border-radius:999px;font-size:15px;color:var(--txt-dim);
  transition:color .25s,background .25s;white-space:nowrap;
}
.site-nav a:hover{color:#fff;background:var(--panel)}
.nav-cta{
  padding:10px 22px;border-radius:999px;font-size:14px;font-weight:700;white-space:nowrap;
  color:#06121f;background:linear-gradient(120deg,#5ee0ff,#a06bff);
  box-shadow:0 10px 24px -10px rgba(94,224,255,.7);
  transition:transform .3s var(--ease);
}
.nav-cta:hover{transform:translateY(-2px)}
@media (max-width:900px){
  .site-nav{display:none}
  .header-inner{height:64px;gap:14px}
  .brand-text{font-size:17px}
}

/* ---------- 通用区块 ---------- */
.section{padding:112px 0;position:relative}
.section-alt{background:linear-gradient(180deg,rgba(255,255,255,.015),rgba(255,255,255,0))}
.section-dark{background:radial-gradient(1200px 500px at 80% 20%,rgba(160,107,255,.18),transparent 60%),var(--bg-2)}
.section-head{text-align:center;max-width:720px;margin:0 auto 64px}
.section-tag{
  display:inline-block;font-size:12px;letter-spacing:3px;color:var(--cyan);font-weight:700;
  padding:6px 14px;border-radius:999px;background:rgba(94,224,255,.08);margin-bottom:18px;
}
.section-head h2{font-size:44px;line-height:1.2;letter-spacing:.5px;margin-bottom:16px}
.section-head p{color:var(--txt-dim);font-size:17px}
@media (max-width:760px){
  .section{padding:76px 0}
  .section-head{margin-bottom:40px}
  .section-head h2{font-size:32px}
  .section-head p{font-size:15px}
}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100vh;display:grid;align-items:center;padding:140px 0 90px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);animation:kb 18s linear infinite alternate}
@keyframes kb{from{transform:scale(1.08) translate(0,0)}to{transform:scale(1.16) translate(-2%,-1.5%)}}
.hero-veil{
  position:absolute;inset:0;
  background:
    radial-gradient(900px 500px at 50% 45%,rgba(10,16,48,.35),transparent 60%),
    linear-gradient(180deg,rgba(7,10,28,.25) 0%,rgba(7,10,28,.92) 100%);
}
.hero-inner{
  position:relative;z-index:2;text-align:center;
  display:flex;flex-direction:column;align-items:center;
}
.hero-eyebrow{font-size:13px;letter-spacing:5px;color:var(--cyan);font-weight:700;margin-bottom:24px}
.hero-title{
  font-size:clamp(34px,6.4vw,76px);line-height:1.12;font-weight:800;letter-spacing:1px;
  text-shadow:0 12px 40px rgba(0,0,0,.6);
  background:linear-gradient(100deg,#fff 10%,#b9eaff 45%,#c9b6ff 80%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-desc{
  max-width:660px;margin:26px 0 40px;color:rgba(230,236,255,.88);font-size:17px;
}
.hero-desc strong{color:#fff;font-weight:700}
/* 居中双悬浮按钮 */
.hero-buttons{
  display:flex;flex-wrap:wrap;gap:20px;justify-content:center;
  animation:rise .9s var(--ease) both;
}
@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.hero-stats{
  display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:64px;
  width:100%;max-width:900px;
}
.hero-stats li{
  flex:1 1 150px;padding:18px 14px;border-radius:16px;
  background:rgba(255,255,255,.04);border:1px solid var(--panel-line);
  backdrop-filter:blur(8px);
}
.hero-stats b{display:block;font-size:30px;font-weight:800;color:#fff;line-height:1.2}
.hero-stats b::after{content:attr(data-suffix)}
.hero-stats span{font-size:13px;color:var(--txt-dim)}
.hero-scroll{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;
  width:26px;height:42px;border-radius:999px;border:1.5px solid rgba(255,255,255,.35);
}
.hero-scroll span{position:absolute;left:50%;top:8px;width:4px;height:8px;border-radius:999px;background:var(--cyan);transform:translateX(-50%);animation:scrolly 1.6s infinite}
@keyframes scrolly{0%{opacity:1;transform:translate(-50%,0)}80%{opacity:0;transform:translate(-50%,14px)}100%{opacity:0}}

/* ---------- 游戏矩阵 ---------- */
.games-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.game-card{
  position:relative;border-radius:20px;overflow:hidden;
  background:var(--bg-2);border:1px solid var(--panel-line);
  transition:transform .45s var(--ease),border-color .35s,box-shadow .45s var(--ease);
  display:flex;flex-direction:column;
}
.game-card:hover{transform:translateY(-10px);border-color:rgba(94,224,255,.55);box-shadow:0 30px 60px -24px rgba(94,224,255,.45)}
.game-card img{width:100%;height:200px;transition:transform .7s var(--ease)}
.game-card:hover img{transform:scale(1.07)}
.game-card-body{padding:22px;display:flex;flex-direction:column;flex:1}
.game-tag{
  align-self:flex-start;font-size:12px;font-weight:700;letter-spacing:1px;color:var(--cyan);
  padding:5px 12px;border-radius:999px;background:rgba(94,224,255,.1);margin-bottom:12px;
}
.game-card h3{font-size:24px;margin-bottom:10px;letter-spacing:.5px}
.game-card p{color:var(--txt-dim);font-size:14.5px;margin-bottom:18px;flex:1}
.game-meta{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.game-meta span{font-size:12.5px;color:var(--txt-dim);padding:5px 12px;border-radius:999px;background:var(--panel);border:1px solid var(--panel-line)}
.game-link{
  font-weight:700;font-size:15px;color:#fff;display:inline-flex;align-items:center;gap:8px;
}
.game-link::after{content:"→";transition:transform .3s}
.game-card:hover .game-link::after{transform:translateX(6px)}
@media (max-width:1000px){.games-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.games-grid{grid-template-columns:1fr}}

/* ---------- 特性 ---------- */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{
  padding:30px 26px;border-radius:20px;background:rgba(255,255,255,.035);
  border:1px solid var(--panel-line);transition:transform .35s var(--ease),background .35s;
}
.feature:hover{transform:translateY(-6px);background:rgba(94,224,255,.06)}
.feature-ic{width:60px;height:60px;border-radius:16px;display:grid;place-items:center;margin-bottom:18px;color:var(--cyan);
  background:linear-gradient(135deg,rgba(94,224,255,.16),rgba(160,107,255,.12))}
.feature h3{font-size:20px;margin-bottom:10px}
.feature p{color:var(--txt-dim);font-size:14.5px}
@media (max-width:860px){.features-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.features-grid{grid-template-columns:1fr}}

/* ---------- 资讯 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:auto auto;gap:24px}
.news-card{
  position:relative;border-radius:18px;overflow:hidden;background:var(--bg-2);border:1px solid var(--panel-line);
  display:flex;flex-direction:column;transition:transform .4s var(--ease),border-color .3s;
}
.news-card:hover{transform:translateY(-6px);border-color:rgba(255,207,122,.5)}
.news-card img{width:100%;height:180px;transition:transform .7s var(--ease)}
.news-card:hover img{transform:scale(1.06)}
.news-card-body{padding:20px;display:flex;flex-direction:column;flex:1}
.news-card time{font-size:12.5px;color:var(--cyan);font-weight:700;letter-spacing:.5px}
.news-cat{font-size:11.5px;color:var(--txt-dim);margin-left:10px;padding:3px 10px;border-radius:999px;background:var(--panel)}
.news-card h3{font-size:17px;margin:12px 0 8px;line-height:1.5}
.news-card p{color:var(--txt-dim);font-size:13.5px}
.news-card--feature{grid-row:1 / span 2;grid-column:1}
.news-card--feature img{height:100%;min-height:320px}
.news-card--feature .news-card-body{position:absolute;left:0;right:0;bottom:0;padding:30px 26px;
  background:linear-gradient(0deg,rgba(7,10,28,.96),rgba(7,10,28,0));justify-content:flex-end}
.news-card--feature h3{font-size:24px}
@media (max-width:900px){
  .news-grid{grid-template-columns:1fr 1fr}
  .news-card--feature{grid-row:auto;grid-column:1 / -1}
  .news-card--feature img{min-height:240px}
  .news-card--feature .news-card-body{position:static;padding:20px;background:none}
  .news-card--feature h3{font-size:20px}
}
@media (max-width:560px){.news-grid{grid-template-columns:1fr}}

/* ---------- 下载 ---------- */
.download-inner{display:grid;grid-template-columns:1fr 1.1fr;gap:60px;align-items:center}
.download-text h2{font-size:38px;margin:12px 0 18px;line-height:1.25}
.download-text p{color:var(--txt-dim);font-size:16px;margin-bottom:26px}
.download-checks li{
  display:flex;gap:14px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.07);font-size:15px;color:rgba(230,236,255,.9);
}
.download-checks li b{color:var(--cyan);min-width:88px;font-weight:700}
.download-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.dl-card{
  display:flex;align-items:center;gap:16px;padding:20px;border-radius:16px;cursor:pointer;
  background:rgba(255,255,255,.04);border:1px solid var(--panel-line);
  transition:transform .35s var(--ease),border-color .3s,background .3s;
}
.dl-card:hover{transform:translateY(-5px);border-color:rgba(94,224,255,.6);background:rgba(94,224,255,.07)}
.dl-card svg{flex:none;color:var(--cyan)}
.dl-card span{display:block;font-size:17px;font-weight:700}
.dl-card small{display:block;font-size:12.5px;color:var(--txt-dim);margin-top:3px}
@media (max-width:900px){.download-inner{grid-template-columns:1fr;gap:40px}.download-text h2{font-size:30px}}
@media (max-width:480px){.download-cards{grid-template-columns:1fr}}

/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:start}
.about-text h3{font-size:22px;margin:0 0 14px;color:#fff}
.about-text p{color:var(--txt-dim);font-size:15.5px;margin-bottom:22px}
.timeline{border-left:2px solid rgba(94,224,255,.3);padding-left:24px;margin-top:8px}
.timeline li{position:relative;padding:12px 0;color:var(--txt-dim);font-size:15px}
.timeline li::before{content:"";position:absolute;left:-31px;top:20px;width:11px;height:11px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px rgba(94,224,255,.18)}
.timeline li b{display:inline-block;min-width:56px;color:#fff;font-weight:800;margin-right:12px}
.about-figure{border-radius:20px;overflow:hidden;border:1px solid var(--panel-line)}
.about-figure img{width:100%;height:420px;transition:transform .8s var(--ease)}
.about-figure:hover img{transform:scale(1.05)}
.about-figure figcaption{ padding:14px 16px;font-size:13px;color:var(--txt-dim);background:var(--bg-2)}
@media (max-width:860px){.about-grid{grid-template-columns:1fr;gap:34px}.about-figure img{height:280px}}

/* ---------- 社区 ---------- */
.community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.comm-card{position:relative;border-radius:18px;overflow:hidden;border:1px solid var(--panel-line)}
.comm-card img{width:100%;height:210px;transition:transform .7s var(--ease),filter .5s}
.comm-card:hover img{transform:scale(1.08);filter:saturate(1.15)}
.comm-card span{
  position:absolute;left:0;right:0;bottom:0;padding:16px 18px;font-weight:700;font-size:16px;
  background:linear-gradient(0deg,rgba(7,10,28,.95),rgba(7,10,28,0));
}
@media (max-width:860px){.community-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.community-grid{grid-template-columns:1fr}}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:60px}
.contact-text h2{font-size:38px;margin:12px 0 18px;line-height:1.25}
.contact-text p{color:var(--txt-dim);font-size:16px;margin-bottom:28px}
address{font-style:normal;display:grid;gap:14px}
address div{padding:14px 18px;border-radius:12px;background:var(--panel);border:1px solid var(--panel-line);font-size:15px;color:rgba(230,236,255,.9)}
address b{display:inline-block;min-width:104px;color:var(--cyan);font-weight:700}
.contact-form{display:grid;gap:16px;padding:30px;border-radius:20px;background:rgba(255,255,255,.035);border:1px solid var(--panel-line)}
.contact-form label{font-size:13.5px;font-weight:700;color:var(--txt-dim);letter-spacing:.5px}
.contact-form input,.contact-form select,.contact-form textarea{
  width:100%;padding:13px 16px;border-radius:12px;background:rgba(0,0,0,.28);
  border:1px solid var(--panel-line);font-size:15px;transition:border-color .25s,box-shadow .25s;
}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(94,224,255,.14)}
.contact-form textarea{resize:vertical;min-height:110px}
.form-tip{font-size:12.5px;color:var(--txt-dim);line-height:1.6}
@media (max-width:860px){.contact-grid{grid-template-columns:1fr;gap:36px}.contact-text h2{font-size:30px}}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:40px;padding:70px 0 0;border-top:1px solid rgba(255,255,255,.07);background:linear-gradient(180deg,transparent,rgba(0,0,0,.35))}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:50px}
.footer-brand p{margin-top:16px;color:var(--txt-dim);font-size:13.5px;max-width:360px}
.icp{margin-top:18px;font-size:12px;line-height:1.9;color:rgba(168,176,208,.7)}
.footer-col h4{font-size:15px;margin-bottom:16px;color:#fff;letter-spacing:1px}
.footer-col a{display:block;padding:7px 0;color:var(--txt-dim);font-size:14px;transition:color .25s,transform .25s}
.footer-col a:hover{color:var(--cyan);transform:translateX(4px)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 24px;border-top:1px solid rgba(255,255,255,.07);font-size:12.5px;color:var(--txt-dim)}
.back-top{padding:8px 16px;border-radius:999px;background:var(--panel);border:1px solid var(--panel-line);font-weight:700;color:#fff}
@media (max-width:800px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .footer-brand{grid-column:1 / -1}
  .footer-bottom{flex-direction:column;text-align:center}
}