/* ───────────────────────────────────────────────────────────────
   光脉奔流 · Phonton4Ai — 对外官网外壳 (Marketing site)
   复用 app.css 的 token 与组件；此处只加官网导航 / 页脚 / 营销版式
   ─────────────────────────────────────────────────────────────── */
body { font-size: 16px; background: var(--bg); }
.site-wrap { max-width: 1180px; margin-inline: auto; padding-inline: 24px; }
.site-main { position: relative; z-index: 1; }

/* 全站细栅格底纹 */
.site-bg { position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: linear-gradient(color-mix(in oklch,var(--fg) 3%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in oklch,var(--fg) 3%, transparent) 1px, transparent 1px);
  background-size: 60px 60px; mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000, transparent 72%); }

/* ── nav ─────────────────────────────────────────────────────── */
.site-nav { position: sticky; top: 0; z-index: 60; background: color-mix(in oklch,var(--bg-deep) 76%, transparent); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); }
.site-nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.site-logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 600; font-size: 18px; letter-spacing: -0.01em; }
.site-logo .mark { width: 30px; height: 30px; flex: none; filter: drop-shadow(0 0 7px var(--accent-line)); }
.site-logo small { display: block; font-family: var(--font-mono); font-size: 10px; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; font-weight: 400; margin-top: 1px; }
.site-links { display: flex; gap: 26px; }
.site-links a { font-size: 14.5px; color: var(--muted); transition: color .15s; position: relative; }
.site-links a:hover { color: var(--fg); }
.site-links a.active { color: var(--fg); }
.site-spacer { flex: 1; }
.site-actions { display: flex; align-items: center; gap: 12px; }
.site-burger { display: none; width: 40px; height: 40px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); place-items: center; color: var(--fg); }
.site-burger svg { width: 19px; height: 19px; }
.site-burger .x { display: none; } .site-burger.on .m { display: none; } .site-burger.on .x { display: block; }
.site-menu { display: none; }
@media (max-width: 880px) {
  .site-links, .site-actions .desk { display: none; }
  .site-burger { display: grid; }
  .site-menu { position: fixed; top: 64px; left: 0; right: 0; height: calc(100vh - 64px); height: calc(100dvh - 64px); z-index: 55; background: var(--bg-deep); -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px); padding: 22px 24px; flex-direction: column; gap: 4px; overflow-y: auto; }
  .site-menu.open { display: flex; }
  .site-menu a { padding: 14px 12px; margin: 0 -8px; border-radius: 10px; font-size: 17px; color: var(--fg); border-bottom: 1px solid var(--border); }
  .site-menu a:hover, .site-menu a:active { background: var(--fg-soft); }
  .site-menu .btn { margin-top: 18px; width: 100%; }
}

/* ── hero ────────────────────────────────────────────────────── */
.hero { position: relative; overflow: hidden; padding: clamp(56px, 9vw, 116px) 0 clamp(48px, 7vw, 96px); }
.beams { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.beam { position: absolute; height: 2px; width: 44%; left: -44%; border-radius: 2px; opacity: 0;
  background: linear-gradient(90deg, transparent, var(--accent) 42%, oklch(74% 0.16 250) 70%, transparent); filter: blur(.4px); animation: beamflow 6s linear infinite; }
.beam.v { background: linear-gradient(90deg, transparent, var(--accent-2) 45%, transparent); }
.beam:nth-child(1) { top: 14%; animation-delay: 0s; }
.beam:nth-child(2) { top: 30%; width: 36%; animation-delay: 1.3s; }
.beam:nth-child(3) { top: 52%; animation-delay: 2.6s; }
.beam:nth-child(4) { top: 70%; width: 32%; animation-delay: .7s; }
.beam:nth-child(5) { top: 86%; width: 40%; animation-delay: 1.9s; }
@keyframes beamflow { 0% { transform: translateX(0); opacity: 0; } 12% { opacity: .85; } 78% { opacity: .85; } 100% { transform: translateX(330%); opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .beam { animation: none; opacity: .3; } }
.hero-glow { position: absolute; top: -12%; right: 2%; width: 520px; height: 520px; border-radius: 50%; background: radial-gradient(circle, var(--accent-soft), transparent 64%); filter: blur(16px); z-index: 0; pointer-events: none; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
@media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; gap: 40px; } }
.display { font-family: var(--font-display); font-weight: 600; font-size: clamp(38px, 6vw, 66px); line-height: 1.04; letter-spacing: -0.025em; margin: 0; }
.display-sm { font-family: var(--font-display); font-weight: 600; font-size: clamp(30px, 4.4vw, 48px); line-height: 1.08; letter-spacing: -0.022em; margin: 0; }
.flow-text { background: linear-gradient(100deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.glow-text { color: var(--accent); text-shadow: 0 0 30px color-mix(in oklch,var(--accent) 42%, transparent); }
.hero-sub { font-size: clamp(17px, 1.6vw, 20px); color: var(--muted); max-width: 54ch; margin: 22px 0 30px; line-height: 1.6; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.trust-row { display: flex; gap: 12px 26px; flex-wrap: wrap; margin-top: 34px; color: var(--muted); font-size: 14px; }
.trust-row span { display: inline-flex; align-items: center; gap: 7px; }
.trust-row svg { width: 16px; height: 16px; color: var(--accent); flex: none; }

/* ── marketing sections ──────────────────────────────────────── */
.mkt { padding: clamp(56px, 8vw, 100px) 0; position: relative; z-index: 1; }
.mkt.tight { padding: clamp(40px, 5vw, 64px) 0; }
.mkt + .mkt, .mkt.bordered { border-top: 1px solid var(--border); }
.mkt-head { max-width: 62ch; margin-bottom: 44px; }
.mkt-head.center { margin-inline: auto; text-align: center; }
.mkt-head h2 { font-family: var(--font-display); font-size: clamp(26px, 3.4vw, 40px); line-height: 1.12; letter-spacing: -0.02em; }
.mkt-head p { color: var(--muted); font-size: 17px; margin-top: 14px; line-height: 1.6; }
.mkt-grid { display: grid; gap: 18px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 940px) { .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }

/* feature card */
.feature { padding: 26px; }
.feature .fi { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent-line); margin-bottom: 18px; }
.feature .fi svg { width: 21px; height: 21px; }
.feature h3 { font-family: var(--font-display); font-size: 18px; margin-bottom: 9px; }
.feature p { color: var(--muted); font-size: 14.5px; line-height: 1.6; }

/* providers marquee */
.marquee { position: relative; overflow: hidden; -webkit-mask: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent); mask: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent); }
.marquee-track { display: flex; gap: 12px; width: max-content; animation: marq 40s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marq { to { transform: translateX(-50%); } }
.prov { display: inline-flex; align-items: center; gap: 8px; padding: 9px 17px; border: 1px solid var(--border); border-radius: 99px; font-family: var(--font-mono); font-size: 13.5px; color: var(--muted); white-space: nowrap; background: color-mix(in oklch,var(--surface) 50%, transparent); }
.prov b { color: var(--fg); font-weight: 500; }

/* stat band */
.stat-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 700px) { .stat-band { grid-template-columns: repeat(2, 1fr); } }
.stat-band .sb { text-align: center; padding: 22px 14px; }
.stat-band .sb b { font-family: var(--font-mono); font-size: clamp(28px, 4vw, 40px); font-weight: 600; letter-spacing: -0.02em; display: block; background: linear-gradient(120deg, var(--fg), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-band .sb span { color: var(--muted); font-size: 14px; }

/* split (text + visual) */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split.reverse > :first-child { order: 2; }
@media (max-width: 880px) { .split { grid-template-columns: 1fr; gap: 32px; } .split.reverse > :first-child { order: 0; } }

/* video stage (Seedance) */
.vstage { aspect-ratio: 16/9; border-radius: var(--radius-lg); border: 1px solid var(--border); position: relative; display: grid; place-items: center; overflow: hidden;
  background: radial-gradient(120% 120% at 28% 8%, color-mix(in oklch,var(--accent) 24%, transparent), transparent 55%), radial-gradient(120% 120% at 92% 94%, color-mix(in oklch,var(--accent-2) 22%, transparent), transparent 52%), oklch(13% 0.03 255); }
.vstage .play { width: 60px; height: 60px; border-radius: 50%; display: grid; place-items: center; background: color-mix(in oklch,var(--bg) 28%, transparent); border: 1px solid var(--accent-line); backdrop-filter: blur(6px); color: var(--accent); transition: transform .2s; }
.vstage:hover .play { transform: scale(1.06); }
.vstage .play svg { width: 22px; height: 22px; margin-left: 3px; }
.vstage .res { position: absolute; bottom: 12px; right: 12px; font-family: var(--font-mono); font-size: 11px; background: color-mix(in oklch,var(--bg) 55%, transparent); padding: 4px 9px; border-radius: 6px; border: 1px solid var(--border); }
.vstage .tl { position: absolute; top: 12px; left: 12px; }
.price-cmp { display: flex; align-items: baseline; gap: 14px; margin: 18px 0 6px; }
.price-cmp .old { font-family: var(--font-mono); color: var(--muted); text-decoration: line-through; font-size: 16px; }
.price-cmp .new { font-family: var(--font-mono); color: var(--accent); font-size: 30px; font-weight: 600; letter-spacing: -.02em; }
.price-cmp .save { padding: 3px 10px; border-radius: 99px; background: var(--ok-soft); color: var(--ok); font-family: var(--font-mono); font-size: 12px; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step { padding: 26px; position: relative; }
.step .n { font-family: var(--font-mono); font-size: 13px; color: var(--accent); border: 1px solid var(--accent-line); width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; margin-bottom: 16px; background: var(--accent-soft); }
.step h3 { font-family: var(--font-display); font-size: 17px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; line-height: 1.6; }

/* check list */
.checks { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 13px; }
.checks li { display: flex; gap: 11px; font-size: 15px; color: var(--fg); }
.checks li svg { width: 18px; height: 18px; color: var(--accent); flex: none; margin-top: 2px; }
.checks li small { color: var(--muted); display: block; font-size: 13.5px; margin-top: 2px; }

/* CTA band */
.cta-band { position: relative; overflow: hidden; border: 1px solid var(--accent-line); border-radius: var(--radius-lg); padding: clamp(40px, 6vw, 72px) 24px; text-align: center;
  background: radial-gradient(circle at 50% -10%, color-mix(in oklch,var(--accent) 18%, transparent), transparent 60%), radial-gradient(circle at 90% 120%, color-mix(in oklch,var(--accent-2) 14%, transparent), transparent 55%), var(--surface); }
.cta-band h2 { font-family: var(--font-display); font-size: clamp(26px, 3.6vw, 42px); letter-spacing: -0.02em; }
.cta-band p { color: var(--muted); font-size: 17px; margin: 14px auto 28px; max-width: 50ch; }
.cta-band .hero-cta { justify-content: center; }

/* faq */
.faq { border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; background: var(--surface); }
.faq details { border-bottom: 1px solid var(--border); }
.faq details:last-child { border-bottom: 0; }
.faq summary { padding: 18px 22px; cursor: pointer; font-weight: 500; font-size: 16px; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-family: var(--font-mono); color: var(--accent); font-size: 20px; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .a { padding: 0 22px 20px; color: var(--muted); font-size: 14.5px; line-height: 1.7; }

/* ── footer ──────────────────────────────────────────────────── */
.site-foot { border-top: 1px solid var(--border); background: var(--bg-deep); padding: 56px 0 36px; position: relative; z-index: 1; }
.foot-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 32px; }
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; } }
.foot-brand .site-logo { margin-bottom: 14px; }
.foot-brand p { color: var(--muted); font-size: 14px; max-width: 30ch; line-height: 1.6; }
.foot-col h5 { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin: 4px 0 14px; }
.foot-col a { display: block; color: var(--muted); font-size: 14px; padding: 5px 0; transition: color .14s; }
.foot-col a:hover { color: var(--accent); }
.foot-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--border); color: var(--faint); font-size: 13px; }
.foot-bottom .mono { font-family: var(--font-mono); }