/* =========================================================
   星管家 — Dark Premium Tech Theme
   ========================================================= */

/* ---------- Tokens ---------- */
:root{
  --bg:#f4f5fb;
  --bg-2:#ffffff;
  --bg-3:#e9ebf5;
  --text:#1b1c2e;
  --text-dim:#4b4d63;
  --text-mute:#8a8ca0;
  --purple:#7c3aed;
  --purple-2:#a855f7;
  --purple-deep:#6d28d9;
  --gold:#f59e0b;
  --line:rgba(20,21,46,.10);
  --line-strong:rgba(20,21,46,.18);
  --glass:rgba(255,255,255,.55);
  --glass-hover:rgba(255,255,255,.78);
  --grad-purple:linear-gradient(135deg,#7c3aed 0%,#a855f7 100%);

  --font-display:"Space Grotesk","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,system-ui,sans-serif;

  --container:1200px;
  --radius:16px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:80px;background:var(--bg)}
body{
  margin:0;
  font-family:var(--font-body);
  background:transparent;
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3{font-family:var(--font-display);line-height:1.15;margin:0;font-weight:600;letter-spacing:-.01em}
p{margin:0}

.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:24px}

/* ---------- Background layers ---------- */
#bg-canvas{
  position:fixed;inset:0;width:100%;height:100%;
  z-index:-1;pointer-events:none;
}
.bg-glow{
  position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
    radial-gradient(60% 50% at 50% 36%,rgba(168,85,247,.16),transparent 70%),
    radial-gradient(42% 38% at 82% 18%,rgba(124,58,237,.12),transparent 70%),
    radial-gradient(42% 38% at 14% 82%,rgba(168,85,247,.12),transparent 70%);
  opacity:1;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-display);font-weight:500;font-size:.95rem;
  padding:11px 22px;border-radius:999px;
  border:1px solid var(--line-strong);
  transition:transform .25s var(--ease),background .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),color .25s var(--ease);
  white-space:nowrap;
}
.btn--lg{padding:14px 30px;font-size:1.02rem}
.btn--primary{
  background:var(--grad-purple);border-color:transparent;color:#fff;
  box-shadow:0 8px 30px -8px rgba(139,92,246,.6);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 38px -8px rgba(139,92,246,.75)}
.btn--ghost{background:var(--glass);color:var(--text);backdrop-filter:blur(8px)}
.btn--ghost:hover{background:var(--glass-hover);border-color:var(--purple);transform:translateY(-2px)}

/* ---------- Nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background .3s var(--ease),backdrop-filter .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
  border-bottom:1px solid transparent;
}
.nav--scrolled{
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom-color:var(--line);
  box-shadow:0 1px 0 rgba(20,21,46,.04);
}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:600;font-size:1.15rem}
.brand__logo{width:36px;height:36px;border-radius:9px;box-shadow:0 0 0 1px var(--line-strong),0 6px 18px -6px rgba(139,92,246,.5)}
.nav__actions{display:flex;align-items:center;gap:10px}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;text-align:center;padding:120px 0 80px}
/* soft dark halo behind hero text — lifts contrast over the particle star */
.hero::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:radial-gradient(46% 46% at 50% 46%,rgba(255,255,255,.6),transparent 72%)}
.hero__inner{position:relative;z-index:1;max-width:860px;margin-inline:auto}
.hero__eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-display);font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-dim);
  padding:7px 16px;border-radius:999px;border:1px solid var(--line);background:var(--glass);
  margin-bottom:28px;
}
.hero__eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--purple);box-shadow:0 0 10px var(--purple)}
.hero__title{
  font-size:clamp(2.6rem,7vw,4.6rem);font-weight:700;line-height:1.08;
  margin-bottom:22px;
}
.grad{
  background:linear-gradient(120deg,#6d28d9 0%,#a855f7 45%,#f59e0b 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero__sub{font-size:clamp(1.05rem,2.2vw,1.25rem);color:var(--text-dim);margin-bottom:38px}
.hero__cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero__tags{
  display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:44px;
}
.hero__tags li{
  font-size:.85rem;color:var(--text-mute);
  padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:var(--glass);
}
.hero__scroll{
  position:absolute;left:50%;bottom:26px;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:8px;
  font-size:.72rem;letter-spacing:.2em;color:var(--text-mute);text-transform:uppercase;
}
.hero__scroll span{width:1px;height:34px;background:linear-gradient(var(--purple),transparent);animation:scrolldot 1.8s var(--ease) infinite}
@keyframes scrolldot{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ---------- Sections ---------- */
.section{padding:120px 0;position:relative}
.section--alt{background:linear-gradient(180deg,transparent,var(--bg-2) 20%,var(--bg-2) 80%,transparent)}
.section__head{max-width:680px;margin:0 auto 64px;text-align:center}
.section__kicker{font-family:var(--font-display);font-size:.78rem;letter-spacing:.22em;color:var(--purple);text-transform:uppercase;margin-bottom:14px}
.section__title{font-size:clamp(2rem,4.5vw,3rem);margin-bottom:16px}
.section__desc{color:var(--text-dim);font-size:1.05rem}

/* ---------- Grid + Cards ---------- */
.grid{display:grid;gap:20px}
.grid--features{grid-template-columns:repeat(3,1fr)}
.grid--shots{grid-template-columns:repeat(3,1fr);margin-top:24px}

.card{
  position:relative;padding:30px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(10px);
  transition:transform .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease),box-shadow .35s var(--ease);
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,rgba(139,92,246,.5),transparent 40%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .35s var(--ease);
}
.card:hover{transform:translateY(-6px);background:var(--glass-hover);border-color:var(--line-strong);box-shadow:0 20px 50px -20px rgba(124,58,237,.45)}
.card:hover::before{opacity:1}
.card__icon{
  width:52px;height:52px;border-radius:13px;display:grid;place-items:center;
  color:var(--purple);background:rgba(139,92,246,.12);border:1px solid rgba(139,92,246,.25);
  margin-bottom:20px;
}
.card__icon svg{width:26px;height:26px}
.card__icon--gold{color:var(--gold);background:rgba(251,191,36,.10);border-color:rgba(251,191,36,.25)}
.card__title{font-size:1.22rem;margin-bottom:10px}
.card__text{color:var(--text-dim);font-size:.97rem}
.card--more{display:flex;flex-direction:column;justify-content:center;text-align:center;align-items:center;border-style:dashed}

/* ---------- Steps ---------- */
.steps{display:flex;align-items:stretch;gap:16px;justify-content:center}
.step{flex:1;max-width:340px;padding:32px;border-radius:var(--radius);background:var(--glass);border:1px solid var(--line);text-align:center}
.step__num{
  font-family:var(--font-display);font-size:1rem;font-weight:600;
  display:inline-block;padding:5px 14px;border-radius:999px;margin-bottom:18px;
  background:rgba(139,92,246,.12);color:var(--purple);border:1px solid rgba(139,92,246,.25);
}
.step__title{font-size:1.25rem;margin-bottom:10px}
.step__text{color:var(--text-dim);font-size:.95rem}
.step__step-line{flex:0 0 60px;align-self:center;height:1px;background:linear-gradient(90deg,transparent,var(--line-strong),transparent);position:relative}
.step__step-line::after{content:"";position:absolute;right:-2px;top:50%;width:8px;height:8px;border-right:1.5px solid var(--purple);border-top:1.5px solid var(--purple);transform:translateY(-50%) rotate(45deg)}

/* ---------- Showcase placeholders ---------- */
.showcase__video{margin-bottom:0}
.ph-video{
  position:relative;aspect-ratio:16/9;border-radius:20px;
  border:1.5px dashed var(--line-strong);background:var(--bg-2);
  display:grid;place-items:center;overflow:hidden;
}
.ph-video::before{content:"";position:absolute;inset:0;background:radial-gradient(50% 60% at 50% 50%,rgba(124,58,237,.12),transparent 70%)}
.ph-video__play{
  width:76px;height:76px;border-radius:50%;display:grid;place-items:center;
  background:var(--grad-purple);color:#fff;box-shadow:0 12px 40px -8px rgba(139,92,246,.7);
  transition:transform .3s var(--ease);
}
.ph-video__play:hover{transform:scale(1.08)}
.ph-video__play svg{width:30px;height:30px;margin-left:3px}
.ph-shot{
  aspect-ratio:4/3;border-radius:14px;border:1.5px dashed var(--line-strong);
  background:var(--bg-2);display:grid;place-items:center;
}
.ph__hint{font-size:.82rem;color:var(--text-mute);letter-spacing:.04em}

/* ---------- CTA Band ---------- */
.cta{padding:100px 0}
.cta__inner{
  text-align:center;padding:64px 32px;border-radius:24px;
  background:radial-gradient(80% 120% at 50% 0%,rgba(124,58,237,.18),transparent 60%),var(--glass);
  border:1px solid var(--line-strong);backdrop-filter:blur(10px);
}
.cta__title{font-size:clamp(1.8rem,4vw,2.6rem);margin-bottom:14px}
.cta__desc{color:var(--text-dim);font-size:1.05rem;margin-bottom:32px}
.cta__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- Footer ---------- */
.footer{padding:34px 0;border-top:1px solid var(--line);background:var(--bg)}
.footer__inner{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;font-size:.85rem;color:var(--text-mute)}
.footer__sep{color:var(--text-mute)}
.footer__icp{transition:color .2s var(--ease)}
.footer__icp:hover{color:var(--purple)}

/* ---------- Reveal (no-JS safe) ---------- */
.js .reveal{opacity:0;transform:translateY(22px)}
/* If GSAP fails to load, main.js adds this so content is never stuck hidden */
.reveal-fallback .reveal{opacity:1!important;transform:none!important}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .grid--features,.grid--shots{grid-template-columns:repeat(2,1fr)}
  .steps{flex-direction:column;align-items:center}
  .step__step-line{flex:0 0 30px;width:1px;height:30px;background:linear-gradient(180deg,transparent,var(--line-strong),transparent)}
  .step__step-line::after{right:50%;top:auto;bottom:-2px;transform:translate(50%,0) rotate(135deg)}
}
@media (max-width:600px){
  .section{padding:80px 0}
  .hero{padding:110px 0 70px}
  .grid--features,.grid--shots{grid-template-columns:1fr}
  .brand__name{display:none}
  .nav__inner{height:60px}
  .btn{padding:10px 18px}
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .js .reveal{opacity:1;transform:none}
}

/* ---------- CSS star — always visible (reliable background; WebGL layer sits above it) ---------- */
.bg-star{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  display:flex;align-items:center;justify-content:center;
  opacity:.3;
  animation:bgstar-spin 80s linear infinite, bgstar-pulse 4.5s ease-in-out infinite;
}
.bg-star svg{
  width:min(74vmin,540px);height:min(74vmin,540px);
  filter:drop-shadow(0 0 28px rgba(139,92,246,.55)) drop-shadow(0 0 70px rgba(251,191,36,.22));
}
/* No longer hidden by has-webgl: the CSS star is the dependable background. The WebGL canvas
   (z-index:-1) paints above it; if WebGL renders, particle star leads with CSS star showing
   through around it. If WebGL is blank, the CSS star is what you see. */
@keyframes bgstar-spin{to{transform:rotate(360deg)}}
@keyframes bgstar-pulse{0%,100%{opacity:.2}50%{opacity:.38}}