/* ============================================================
   FLIGHT LAB — prototype styles
   替换品牌色：改下面 --accent 即可
   ============================================================ */

:root{
  --bg:#08090a;
  --surface:#101114;
  --surface-2:#17191d;
  --line:#25272c;
  --text:#f3f3f1;
  --muted:#9698a0;
  --accent:#ccff4d;
  --accent-ink:#0b0d00;
  --sky:#6fd3ff;
  --max:1120px;
  --radius:14px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.65;letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.15;letter-spacing:-.02em;font-weight:650}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
.section{padding:84px 0;border-top:1px solid var(--line)}
.section.tight{padding:56px 0}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:18px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--accent)}
h2{font-size:clamp(26px,3.4vw,40px)}
.lede{color:var(--muted);font-size:17px;max-width:62ch;margin-top:14px}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:rgba(8,9,10,.78);border-bottom:1px solid var(--line);
}
.nav .wrap{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;flex-direction:column;line-height:1.15;font-weight:700}
.brand small{font-size:9.5px;letter-spacing:.28em;color:var(--muted);font-weight:500}
.brand span{font-size:15.5px;letter-spacing:.04em}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav-links a{transition:color .15s}
.nav-links a:hover,.nav-links a.on{color:var(--text)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:999px;font-size:14px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:#3a3d44;background:var(--surface)}
.btn-sm{height:36px;padding:0 16px;font-size:13px}
.btn-block{width:100%}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:96px 0 72px}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(900px 380px at 78% 6%,rgba(204,255,77,.10),transparent 62%),
    radial-gradient(700px 340px at 10% 92%,rgba(111,211,255,.07),transparent 62%);
}
.hero .wrap{position:relative}
.hero h1{font-size:clamp(34px,6.2vw,62px);max-width:15ch}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lede{font-size:18px;max-width:52ch;margin-top:22px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}

.streaks{position:absolute;inset:0;overflow:hidden;pointer-events:none;opacity:.45}
.streaks i{
  position:absolute;height:1px;width:34%;left:-40%;
  background:linear-gradient(90deg,transparent,rgba(204,255,77,.6),transparent);
  animation:fly 8s linear infinite;
}
.streaks i:nth-child(1){top:18%;animation-delay:0s}
.streaks i:nth-child(2){top:37%;animation-delay:-2.4s;width:26%}
.streaks i:nth-child(3){top:58%;animation-delay:-4.8s;width:44%}
.streaks i:nth-child(4){top:76%;animation-delay:-1.2s;width:22%}
.streaks i:nth-child(5){top:90%;animation-delay:-6s;width:38%}
@keyframes fly{0%{transform:translateX(0)}100%{transform:translateX(430%)}}
@media(prefers-reduced-motion:reduce){.streaks i{animation:none;opacity:.15}}

/* ---------- stats ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  margin-top:56px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;
}
.stat{background:var(--surface);padding:22px 20px}
.stat b{display:block;font-size:26px;letter-spacing:-.02em;font-weight:650}
.stat span{font-size:12px;color:var(--muted);letter-spacing:.06em}

/* ---------- layout helpers ---------- */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:26px;
}
.card h3{font-size:17px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}

/* ---------- path ---------- */
.path{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.step{
  position:relative;padding:24px 22px;border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,var(--surface),rgba(16,17,20,.35));
}
.step::before{
  counter-increment:s;content:"0" counter(s);
  display:block;font-size:12px;color:var(--accent);
  letter-spacing:.16em;margin-bottom:14px;font-weight:700;
}
.step h3{font-size:16px;margin-bottom:6px}
.step p{font-size:13.5px;color:var(--muted)}

/* ---------- media placeholder ---------- */
.media{
  aspect-ratio:16/10;border-radius:12px;border:1px dashed #33363d;
  background:
    linear-gradient(135deg,rgba(204,255,77,.06),transparent 45%),
    repeating-linear-gradient(115deg,#121317 0 10px,#0e0f12 10px 20px);
  display:grid;place-items:center;color:#5f626b;
  font-size:12.5px;letter-spacing:.08em;text-align:center;padding:16px;
}

/* ---------- tags ---------- */
.tag{
  display:inline-block;font-size:11px;letter-spacing:.08em;
  padding:4px 10px;border-radius:999px;
  border:1px solid var(--line);color:var(--muted);
}
.tag.free{color:var(--accent-ink);background:var(--accent);border-color:transparent;font-weight:700}
.tag.lock{color:var(--sky);border-color:rgba(111,211,255,.32)}

/* ---------- table ---------- */
.table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:26px}
.table th,.table td{text-align:left;padding:16px 18px;border-bottom:1px solid var(--line)}
.table th{font-size:11.5px;letter-spacing:.1em;color:var(--muted);font-weight:600;text-transform:uppercase}
.table tr:last-child td{border-bottom:0}
.table td:last-child,.table th:last-child{text-align:right}
.table .price{font-size:19px;font-weight:650;letter-spacing:-.01em}
.table .best{color:var(--accent)}

/* ---------- faq ---------- */
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{
  cursor:pointer;font-weight:600;font-size:15.5px;list-style:none;
  display:flex;justify-content:space-between;gap:16px;align-items:flex-start;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--muted);font-weight:400;flex:none}
.faq details[open] summary::after{content:"–"}
.faq p{color:var(--muted);font-size:14.5px;margin-top:12px;max-width:72ch}

/* ---------- form ---------- */
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.field label{font-size:13px;color:var(--muted)}
.field input,.field select,.field textarea{
  background:var(--surface-2);border:1px solid var(--line);border-radius:10px;
  padding:12px 14px;color:var(--text);font:inherit;font-size:14.5px;outline:none;
  transition:border-color .15s;width:100%;
}
.field input:focus,.field select:focus,.field textarea:focus{border-color:#4a4e57}
.field textarea{resize:vertical;min-height:96px}

/* ---------- note / callout ---------- */
.note{
  font-size:13px;color:var(--muted);
  border-left:2px solid var(--accent);padding:2px 0 2px 14px;margin-top:18px;
}
.callout{
  background:rgba(204,255,77,.06);border:1px solid rgba(204,255,77,.22);
  border-radius:12px;padding:18px 20px;font-size:14px;color:#d8dab0;
}

/* ---------- quote ---------- */
.quote{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.quote p{font-size:15px;line-height:1.7}
.quote footer{margin-top:16px;font-size:12.5px;color:var(--muted);border:0;padding:0}

/* ---------- cta band ---------- */
.cta-band{
  background:linear-gradient(120deg,rgba(204,255,77,.10),rgba(111,211,255,.06));
  border:1px solid var(--line);border-radius:20px;padding:48px;
  display:flex;align-items:center;justify-content:space-between;
  gap:32px;flex-wrap:wrap;
}
.cta-band h2{font-size:clamp(24px,3vw,34px);max-width:20ch}
.cta-band p{color:var(--muted);margin-top:10px;font-size:15px}

/* ---------- pricing card ---------- */
.plan{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:6px;
}
.plan.hl{border-color:rgba(204,255,77,.45);background:linear-gradient(180deg,rgba(204,255,77,.07),var(--surface))}
.plan .amount{font-size:30px;font-weight:650;letter-spacing:-.02em;margin-top:6px}
.plan .amount small{font-size:13px;font-weight:400;color:var(--muted);letter-spacing:0}
.plan ul{margin-top:14px;display:grid;gap:8px}
.plan li{font-size:13.5px;color:var(--muted);padding-left:18px;position:relative}
.plan li::before{content:"";position:absolute;left:0;top:.62em;width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.8}
.plan .btn{margin-top:20px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:56px 0 40px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.foot-grid h4{font-size:11.5px;letter-spacing:.16em;color:var(--muted);margin-bottom:14px;text-transform:uppercase;font-weight:600}
.foot-grid a{display:block;font-size:14px;color:#c9cad0;padding:4px 0;transition:color .15s}
.foot-grid a:hover{color:var(--accent)}
.foot-note{
  margin-top:40px;padding-top:22px;border-top:1px solid var(--line);
  font-size:12.5px;color:#6b6e77;display:flex;justify-content:space-between;
  gap:16px;flex-wrap:wrap;
}

/* ---------- misc ---------- */
.mt-8{margin-top:8px}.mt-14{margin-top:14px}.mt-18{margin-top:18px}
.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-36{margin-top:36px}
.muted{color:var(--muted)}
.small{font-size:13px}
.center{text-align:center}

/* ---------- video card ---------- */
.vcard{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;transition:border-color .18s,transform .18s;
}
.vcard:hover{border-color:#34373e;transform:translateY(-2px)}
.vthumb{
  position:relative;aspect-ratio:16/9;display:grid;place-items:center;
  border-bottom:1px solid var(--line);
  background:
    linear-gradient(135deg,rgba(204,255,77,.05),transparent 50%),
    repeating-linear-gradient(115deg,#121317 0 9px,#0e0f12 9px 18px);
}
.vplay{
  width:44px;height:44px;border-radius:50%;
  background:rgba(204,255,77,.92);color:#0b0d00;
  display:grid;place-items:center;font-size:13px;padding-left:3px;
  transition:transform .18s;
}
.vcard:hover .vplay{transform:scale(1.07)}
.vtime{
  position:absolute;right:10px;bottom:10px;font-size:11px;
  background:rgba(0,0,0,.72);padding:2px 7px;border-radius:5px;color:#dcdde0;
}
.vbody{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.vbody h3{font-size:15.5px;line-height:1.35}
.vbody p{font-size:13.5px;color:var(--muted)}
.vlinks{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto;padding-top:14px}
.vlinks a{
  font-size:11.5px;color:var(--muted);border:1px solid var(--line);
  border-radius:999px;padding:4px 10px;transition:.15s;
}
.vlinks a:hover{color:var(--accent);border-color:rgba(204,255,77,.4)}

.foot-note a{color:inherit;transition:color .15s}
.foot-note a:hover{color:var(--accent)}

/* ---------- prose (legal pages) ---------- */
.prose{max-width:74ch}
.prose h1{font-size:clamp(28px,4vw,40px);margin-bottom:10px}
.prose h2{font-size:21px;margin:36px 0 12px}
.prose h3{font-size:16px;margin:24px 0 8px}
.prose p{color:var(--muted);font-size:15px;margin-bottom:12px}
.prose ul{color:var(--muted);font-size:15px;margin:0 0 12px;padding-left:20px;list-style:disc}
.prose li{margin-bottom:6px}
.prose .updated{font-size:13px;color:#6b6e77;margin-bottom:28px}
.prose .warn{
  border:1px solid rgba(204,255,77,.25);background:rgba(204,255,77,.06);
  border-radius:10px;padding:14px 16px;font-size:13.5px;color:#d8dab0;margin-bottom:28px;
}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .g3,.g4,.path,.stats{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
}
@media(max-width:600px){
  .section{padding:60px 0}
  .g2,.g3,.g4,.path,.stats{grid-template-columns:1fr}
  .hero{padding:64px 0 48px}
  .cta-band{padding:32px 24px}
  .foot-grid{grid-template-columns:1fr}
  .table th,.table td{padding:12px 10px;font-size:13.5px}
}

/* ---------- photos ---------- */
.grid img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;border:1px solid var(--line);display:block}
.portrait{width:100%;max-width:420px;border-radius:16px;border:1px solid var(--line);object-fit:cover}
.qr-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:16px}
.qr-row figure{margin:0;text-align:center}
.qr-row img{width:132px;border-radius:10px;border:1px solid var(--line);background:#fff;display:block}
.qr-row figcaption{font-size:11.5px;color:var(--muted);margin-top:7px;letter-spacing:.04em}
.grid img.portrait{aspect-ratio:auto;height:auto;object-fit:cover}
.grid img.flat{border-radius:12px}

/* ---------- follow band ---------- */
.follow{
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  border:1px solid var(--line);border-radius:14px;padding:16px 20px;
  background:linear-gradient(120deg,rgba(204,255,77,.06),var(--surface) 60%);
}
.follow strong{font-size:15px;margin-right:10px}
.follow-links{display:flex;gap:10px;flex-wrap:wrap}

/* ---------- video cover ---------- */
.vcover{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transition:transform .3s ease;
}
.vcard:hover .vcover{transform:scale(1.03)}
.vthumb::before{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(8,9,10,.10),rgba(8,9,10,.42));
}
.vthumb .vplay,.vthumb .vtime{position:relative;z-index:2}