/* 星际娱乐官网 — 全站样式表
   AI Entertainment Studio / Interactive Story Lab / Virtual Idol Control Room */

:root{
  --bg:#05060f;
  --bg-soft:#0a0d1f;
  --surface:#10132a;
  --surface-2:#161a3a;
  --surface-3:#1c2049;
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(255,255,255,.16);
  --text:#f4f5fb;
  --text-dim:#b7bcdd;
  --text-faint:#7d82ab;
  --primary:#5b6bff;
  --primary-2:#8a5cff;
  --cyan:#35e6d3;
  --pink:#d98cff;
  --warn:#ffb454;
  --ok:#43e6a0;
  --gradient-brand:linear-gradient(135deg,#2c2f78 0%,#4a3ea3 42%,#7c4fe0 78%,#9b5cff 100%);
  --gradient-line:linear-gradient(90deg,var(--primary),var(--cyan));
  --shadow-lg:0 24px 60px rgba(6,8,30,.55);
  --shadow-sm:0 8px 24px rgba(6,8,30,.35);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1180px;
  --header-h:64px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{padding-left:1.2em}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;font-weight:700;letter-spacing:.01em}
p{margin:0 0 1em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* background texture */
body{
  background-image:
    radial-gradient(1100px 620px at 82% -8%, rgba(124,79,224,.22), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(53,230,211,.10), transparent 55%);
  background-repeat:no-repeat;
}

/* ---------- header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  height:var(--header-h);
  background:rgba(6,7,20,.92);
  border-bottom:1px solid var(--border);
}
.site-header .container{height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;white-space:nowrap}
.brand img{width:30px;height:30px}
.brand small{display:block;font-weight:400;color:var(--text-faint);font-size:11px;letter-spacing:.04em}

.nav-desktop{display:none}
.nav-desktop ul{list-style:none;display:flex;gap:4px;margin:0;padding:0;flex-wrap:nowrap}
.nav-desktop a{
  display:inline-block;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--text-dim);
  white-space:nowrap;transition:.15s;
}
.nav-desktop a:hover,.nav-desktop a[aria-current="page"]{color:var(--text);background:var(--surface-2)}

.nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:10px;border:1px solid var(--border-strong);
  background:var(--surface);cursor:pointer;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--text);position:relative;
  transition:.2s;
}
.nav-toggle span::before{position:absolute;top:-6px}
.nav-toggle span::after{position:absolute;top:6px}

.nav-mobile{
  position:fixed;inset:0;top:var(--header-h);z-index:49;
  background:#05060c;
  display:none;flex-direction:column;padding:18px 20px 40px;
  overflow-y:auto;
}
.nav-mobile.is-open{display:flex}
.nav-mobile ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.nav-mobile a{
  display:block;padding:14px 6px;border-bottom:1px solid var(--border);font-size:16px;color:var(--text-dim);
}
.nav-mobile a[aria-current="page"]{color:var(--cyan)}

@media (min-width:1180px){
  .nav-desktop{display:block}
  .nav-toggle{display:none}
  .nav-mobile{display:none !important}
}

/* ---------- hero ---------- */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--border)}
.hero-grid{display:grid;grid-template-columns:1fr;gap:32px;align-items:center}
@media (min-width:960px){.hero-grid{grid-template-columns:1.05fr .95fr}}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--cyan);
  background:rgba(53,230,211,.09);border:1px solid rgba(53,230,211,.25);
  padding:5px 12px;border-radius:999px;margin-bottom:16px;letter-spacing:.04em;
}
.hero h1{font-size:clamp(26px,4vw,40px)}
.hero .lead{font-size:18px;color:var(--text-dim);margin-bottom:10px}
.hero .sub{color:var(--text-faint);font-size:15px;max-width:60ch}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:10px;
  font-size:14.5px;font-weight:600;border:1px solid transparent;cursor:pointer;
}
.btn-primary{background:var(--gradient-brand);color:#fff;box-shadow:var(--shadow-sm)}
.btn-ghost{background:var(--surface);border-color:var(--border-strong);color:var(--text)}
.hero-panel{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:14px;box-shadow:var(--shadow-lg);
}
.hero-panel svg{width:100%;height:auto;display:block}
.hero-panel figcaption{margin-top:10px;font-size:12px;color:var(--text-faint);text-align:center}

/* ---------- generic sections ---------- */
section{padding:52px 0}
section.tight{padding:36px 0}
.section-head{max-width:78ch;margin-bottom:28px}
.section-head .eyebrow{margin-bottom:10px}
.section-head h2{font-size:clamp(21px,2.6vw,28px)}
.section-head p{color:var(--text-dim)}
.divider{border:none;border-top:1px solid var(--border);margin:0}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
@media (min-width:720px){.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;
}
.card h3{font-size:17px}
.card p{color:var(--text-dim);font-size:14.5px;margin-bottom:0}
.tag{
  display:inline-block;font-size:11.5px;color:var(--primary-2);background:rgba(138,92,255,.12);
  border:1px solid rgba(138,92,255,.3);padding:3px 9px;border-radius:999px;margin-bottom:10px;
}

/* ---------- article blocks (SEO 正文) ---------- */
.article{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px clamp(18px,3vw,34px);margin-bottom:22px;
}
.article .kicker{color:var(--cyan);font-size:12.5px;letter-spacing:.05em;margin-bottom:8px;display:block}
.article h3{font-size:clamp(18px,2.2vw,22px);margin-bottom:14px}
.article .prose p{color:var(--text-dim);font-size:15px}
.article .prose strong{color:var(--text)}
.article .prose h4{font-size:15.5px;color:var(--text);margin-top:20px}
.article footer{margin-top:16px;padding-top:14px;border-top:1px solid var(--border);font-size:13.5px}
.article footer a{color:var(--cyan)}
.article footer a:hover{text-decoration:underline}

.observe{border-left:3px solid var(--cyan)}

/* ---------- link-back summary cards ---------- */
.linkcard{
  display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:18px;transition:.15s;
}
.linkcard:hover{border-color:var(--border-strong);background:var(--surface-2)}
.linkcard h4{font-size:15.5px;margin-bottom:8px;color:var(--text)}
.linkcard p{font-size:13.5px;color:var(--text-dim);margin-bottom:0}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{
  width:100%;text-align:left;background:none;border:none;color:var(--text);
  font-size:15px;font-weight:600;padding:16px 4px;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
.faq-q::after{content:"+";font-size:20px;color:var(--text-faint);flex-shrink:0}
.faq-item.is-open .faq-q::after{content:"−"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s ease;font-size:14.5px;color:var(--text-dim)}
.faq-item.is-open .faq-a{padding-bottom:16px}
.faq-a p{padding:0 4px}

/* ---------- diagrams ---------- */
.diagram-wrap{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:18px;overflow-x:auto;
}
.diagram-wrap svg{display:block;margin:0 auto}
.diagram-cap{margin-top:10px;font-size:12.5px;color:var(--text-faint);text-align:center}

/* ---------- tabs ---------- */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.tab-btn{
  padding:8px 14px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface);
  color:var(--text-dim);font-size:13.5px;cursor:pointer;
}
.tab-btn.is-active{background:var(--gradient-brand);color:#fff;border-color:transparent}
.tab-panel{display:none}
.tab-panel.is-active{display:block}

/* ---------- table ---------- */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}
th{color:var(--text-faint);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.04em}
td{color:var(--text-dim)}

/* ---------- app interface mock ---------- */
.app-mock{
  background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:20px;
}
.app-mock-badge{font-size:11.5px;color:var(--text-faint);text-align:center;margin-top:10px}

/* ---------- company / footer ---------- */
.company-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:26px clamp(18px,3vw,32px)}

.site-footer{border-top:1px solid var(--border);padding:40px 0 26px;background:var(--bg-soft)}
.footer-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media (min-width:720px){.footer-grid{grid-template-columns:1.3fr 1fr 1fr}}
.footer-grid h5{font-size:13px;color:var(--text-faint);letter-spacing:.04em;margin-bottom:10px}
.footer-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.footer-grid a{color:var(--text-dim);font-size:14px}
.footer-grid a:hover{color:var(--text)}
.footer-bottom{
  margin-top:30px;padding-top:20px;border-top:1px solid var(--border);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;color:var(--text-faint);font-size:12.5px;
}

/* ---------- back to top ---------- */
.to-top{
  position:fixed;right:18px;bottom:18px;width:44px;height:44px;border-radius:50%;
  background:var(--gradient-brand);color:#fff;border:none;display:none;align-items:center;justify-content:center;
  cursor:pointer;box-shadow:var(--shadow-sm);z-index:40;font-size:16px;
}
.to-top.is-visible{display:flex}

/* ---------- breadcrumb ---------- */
.crumb{font-size:13px;color:var(--text-faint);padding:16px 0 0}
.crumb a{color:var(--text-faint)}
.crumb a:hover{color:var(--text-dim)}

/* ---------- misc page hero variants ---------- */
.page-hero{padding:40px 0 30px;border-bottom:1px solid var(--border)}
.page-hero h1{font-size:clamp(24px,3.4vw,34px)}
.page-hero p{color:var(--text-dim);max-width:70ch}

.pill-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.pill{font-size:12.5px;color:var(--text-dim);background:var(--surface-2);border:1px solid var(--border);padding:5px 11px;border-radius:999px}

.callout{
  border:1px solid rgba(53,230,211,.28);background:rgba(53,230,211,.06);
  border-radius:var(--radius-sm);padding:16px 18px;font-size:14.5px;color:var(--text-dim);
}
.callout strong{color:var(--cyan)}

.warn-box{
  border:1px solid rgba(255,180,84,.3);background:rgba(255,180,84,.07);
  border-radius:var(--radius-sm);padding:16px 18px;font-size:14.5px;color:var(--text-dim);
}
.warn-box strong{color:var(--warn)}

@media (max-width:600px){
  section{padding:38px 0}
  .article{padding:22px 16px}
}