/* ============================================================
   Duna Player — dunaplayer.com
   品牌规范 v0.1：Night Indigo #0D1230 / Duna Amber #FF8A2C /
   Dusk Plum #1A1A42 / Dune Gold #F5C269 / Sand #F2E2C5 / Warm White #FAF7F0
   ============================================================ */
:root{
  --indigo:#0D1230;
  --indigo-2:#111740;
  --plum:#1A1A42;
  --card:#181E4A;
  --line:#2A3166;
  --amber:#FF8A2C;
  --amber-2:#FFA24D;
  --gold:#F5C269;
  --sand:#F2E2C5;
  --warm:#FAF7F0;
  --muted:#A9B0D6;
  --radius:16px;
  --shadow:0 18px 50px rgba(3,5,18,.5);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--indigo);
  color:var(--warm);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.font-display{font-family:"Poppins","Segoe UI",sans-serif}
img{max-width:100%;display:block}
a{color:var(--gold);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(13,18,48,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(42,49,102,.6);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.nav-logo img{height:40px;width:auto}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{
  color:var(--muted);font-size:15px;font-weight:500;
  padding:8px 14px;border-radius:10px;transition:.15s;
}
.nav-links a:hover{color:var(--warm);background:rgba(255,138,44,.1);text-decoration:none}
.nav-links a.btn-nav{
  background:linear-gradient(135deg,var(--amber),#ff9a3d);
  color:#221503;font-weight:700;margin-left:8px;
}
.nav-links a.btn-nav:hover{background:linear-gradient(135deg,var(--amber-2),#ffab5e);color:#221503}
.nav-burger{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-burger span{display:block;width:24px;height:2px;background:var(--warm);margin:6px 0;border-radius:2px}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 480px at 78% -10%, rgba(255,138,44,.16), transparent 60%),
    radial-gradient(700px 420px at 8% 110%, rgba(26,26,66,.9), transparent 65%),
    var(--indigo);
  padding:88px 0 72px;
}
.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:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--gold);background:rgba(245,194,105,.1);
  border:1px solid rgba(245,194,105,.3);
  padding:6px 14px;border-radius:999px;margin-bottom:22px;
}
.hero h1{font-size:52px;line-height:1.12;font-weight:800;letter-spacing:-.01em}
.hero h1 .amber{color:var(--amber)}
.hero .lead{font-size:18px;color:var(--muted);margin:20px 0 30px;max-width:520px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:10px;
  background:linear-gradient(135deg,var(--amber),#ff9a3d);
  color:#221503;font-weight:700;font-size:16px;
  padding:15px 30px;border-radius:14px;
  box-shadow:0 10px 30px rgba(255,138,44,.35);
  transition:transform .15s, box-shadow .15s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 36px rgba(255,138,44,.45);text-decoration:none;color:#221503}
.btn-ghost{
  display:inline-flex;align-items:center;gap:10px;
  border:1px solid var(--line);color:var(--warm);
  padding:14px 28px;border-radius:14px;font-weight:600;font-size:16px;
  background:rgba(24,30,74,.5);transition:.15s;
}
.btn-ghost:hover{border-color:var(--amber);color:var(--warm);text-decoration:none;background:rgba(255,138,44,.08)}
.hero-points{display:flex;gap:22px;margin-top:34px;flex-wrap:wrap}
.hero-points div{font-size:14px;color:var(--muted);display:flex;align-items:center;gap:8px}
.hero-points svg{flex:none}

/* TV 画框 mock */
.tv-frame{
  position:relative;border-radius:22px;padding:14px;
  background:linear-gradient(160deg,#262d63,#12163c);
  border:1px solid var(--line);
  box-shadow:var(--shadow), 0 0 90px rgba(255,138,44,.12);
}
.tv-frame img{border-radius:12px;width:100%}
.tv-stand{width:34%;height:10px;margin:0 auto;background:#1c2252;border-radius:0 0 12px 12px}
.tv-glow{position:absolute;inset:auto 10% -34px;height:40px;background:radial-gradient(closest-side,rgba(255,138,44,.35),transparent);filter:blur(10px)}

/* ---------- 平台条 ---------- */
.platforms{border-block:1px solid rgba(42,49,102,.6);background:var(--indigo-2)}
.platforms-inner{display:flex;justify-content:center;gap:56px;padding:22px 24px;flex-wrap:wrap}
.platforms span{color:var(--muted);font-size:14px;letter-spacing:.06em;display:flex;align-items:center;gap:10px}
.platforms b{color:var(--warm);font-family:"Poppins",sans-serif;font-size:15px}

/* ---------- 通用 section ---------- */
section{padding:84px 0}
section.alt{background:linear-gradient(180deg,var(--indigo-2),var(--indigo))}
.sec-head{text-align:center;max-width:720px;margin:0 auto 52px}
.sec-head h2{font-size:36px;font-weight:700;letter-spacing:-.01em}
.sec-head p{color:var(--muted);margin-top:14px;font-size:16.5px}

/* ---------- 特性卡 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{
  background:linear-gradient(165deg,var(--card),rgba(24,30,74,.55));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;transition:transform .18s, border-color .18s, box-shadow .18s;
}
.card:hover{transform:translateY(-4px);border-color:rgba(255,138,44,.5);box-shadow:0 16px 40px rgba(3,5,18,.45)}
.card .ic{
  width:52px;height:52px;border-radius:14px;
  background:rgba(255,138,44,.14);border:1px solid rgba(255,138,44,.35);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.card h3{font-size:18.5px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}

/* ---------- 截图 ---------- */
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.shot{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:transform .18s, box-shadow .18s;
}
.shot:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.shot img{width:100%;aspect-ratio:16/9;object-fit:cover;object-position:top}
.shot figcaption{padding:16px 20px;color:var(--muted);font-size:14.5px;border-top:1px solid var(--line)}
.shot figcaption b{color:var(--warm);display:block;font-size:15px;margin-bottom:2px;font-family:"Poppins",sans-serif}

/* ---------- Split 图文 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split h3{font-size:26px;margin-bottom:16px;letter-spacing:-.01em}
.split p{color:var(--muted);margin-bottom:12px}
.split ul{color:var(--muted);padding-left:20px;margin-bottom:12px}
.split li{margin-bottom:8px}
.split li b, .split p b{color:var(--warm)}

/* ---------- 步骤 ---------- */
.steps{counter-reset:s;max-width:760px;margin:0 auto}
.step{position:relative;padding-left:88px;margin-bottom:38px}
.step::before{
  counter-increment:s;content:counter(s);
  position:absolute;left:0;top:0;width:58px;height:58px;border-radius:16px;
  background:linear-gradient(135deg,var(--amber),#ff9a3d);
  color:#221503;font-size:25px;font-weight:800;font-family:"Poppins",sans-serif;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(255,138,44,.35);
}
.step h3{font-size:20px;margin-bottom:6px}
.step p{color:var(--muted)}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:14px;margin-bottom:14px;background:var(--card);overflow:hidden}
.faq-q{
  width:100%;text-align:left;background:none;border:none;color:var(--warm);
  font-family:"Poppins",sans-serif;font-size:16.5px;font-weight:600;
  padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq-q:hover{color:var(--gold)}
.faq-q .chev{flex:none;transition:transform .2s;color:var(--amber)}
.faq-item.open .faq-q .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-a-inner{padding:0 24px 22px;color:var(--muted);font-size:15px}
.faq-item.open{border-color:rgba(255,138,44,.45)}

/* ---------- 声明 & CTA ---------- */
.notice{
  background:linear-gradient(165deg,var(--card),rgba(24,30,74,.5));
  border:1px solid var(--line);border-left:4px solid var(--amber);
  border-radius:14px;padding:30px 32px;color:var(--muted);font-size:15px;
}
.notice b{color:var(--warm)}
.big-cta{text-align:center;padding:90px 0;background:
  radial-gradient(700px 360px at 50% 120%, rgba(255,138,44,.18), transparent 65%), var(--indigo-2)}
.big-cta h2{font-size:36px;margin-bottom:14px}
.big-cta p{color:var(--muted);margin-bottom:28px}

/* ---------- 下载页 ---------- */
.dl-card{
  background:linear-gradient(165deg,var(--card),rgba(24,30,74,.55));
  border:1px solid var(--line);border-radius:20px;padding:36px;
  display:flex;flex-direction:column;gap:14px;
}
.dl-card h3{font-size:22px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.dl-card h3 .tag{
  font-size:11.5px;font-weight:700;letter-spacing:.1em;color:var(--gold);
  border:1px solid rgba(245,194,105,.4);border-radius:999px;padding:3px 10px;
}
.dl-card p{color:var(--muted);font-size:15px}
.dl-meta{display:flex;gap:18px;flex-wrap:wrap;font-size:13.5px;color:var(--muted);margin-top:auto}
.codeblock{
  background:#0A0E28;border:1px solid var(--line);border-radius:12px;
  padding:18px 20px;font-family:"Cascadia Code",Consolas,monospace;font-size:13.5px;
  color:#C9D1F5;overflow-x:auto;line-height:1.8;
}
.codeblock .c{color:#5D6AA8}
.codeblock .a{color:var(--gold)}
.ver-table{width:100%;border-collapse:collapse;font-size:14.5px}
.ver-table th,.ver-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line)}
.ver-table th{color:var(--muted);font-weight:600;font-size:13px;letter-spacing:.06em;text-transform:uppercase}
.ver-table td{color:var(--warm)}
.badge-ver{background:rgba(255,138,44,.14);color:var(--amber);border:1px solid rgba(255,138,44,.4);border-radius:999px;padding:2px 12px;font-size:12.5px;font-weight:700}

/* ---------- 页脚 ---------- */
footer{border-top:1px solid rgba(42,49,102,.6);background:#0A0E28;padding:52px 0 36px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px}
.foot-grid img{height:34px;margin-bottom:14px}
.foot-grid p{color:var(--muted);font-size:14px;max-width:300px}
.foot-grid h4{font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:var(--warm);margin-bottom:14px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:9px}
.foot-grid a{color:var(--muted);font-size:14px}
.foot-grid a:hover{color:var(--gold)}
.foot-bottom{border-top:1px solid rgba(42,49,102,.5);padding-top:24px;text-align:center;color:var(--muted);font-size:13.5px}

/* ---------- 页头小横幅（内页） ---------- */
.page-hero{padding:72px 0 48px;background:
  radial-gradient(700px 320px at 70% -30%, rgba(255,138,44,.14), transparent 60%), var(--indigo)}
.page-hero h1{font-size:40px;letter-spacing:-.01em}
.page-hero p{color:var(--muted);margin-top:12px;max-width:640px;font-size:17px}
.stat-chips{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.stat-chip{font-size:13px;font-weight:600;color:var(--muted);background:rgba(42,49,102,.35);border:1px solid var(--line);border-radius:999px;padding:5px 14px}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero h1{font-size:40px}
  .grid-3{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr;gap:32px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{
    display:none;position:absolute;top:72px;left:0;right:0;flex-direction:column;
    background:var(--indigo-2);border-bottom:1px solid var(--line);
    padding:16px;gap:4px;align-items:stretch;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 16px}
  .nav-links a.btn-nav{margin:8px 0 0;text-align:center}
  .nav-burger{display:block}
}
@media(max-width:640px){
  .hero{padding:56px 0}
  .hero h1{font-size:32px}
  section{padding:60px 0}
  .grid-3,.grid-2,.gallery{grid-template-columns:1fr}
  .sec-head h2{font-size:27px}
  .page-hero h1{font-size:30px}
  .foot-grid{grid-template-columns:1fr}
  .cta-row .btn,.cta-row .btn-ghost{width:100%;justify-content:center}
}