/* ============================================================
   FoxCut landing — 「暗夜片场」设计系统
   底色与主色沿用桌面端 CSS 变量(#0c0d10 / #6366f1),
   叠加 indigo→violet→magenta 品牌辉光与电影颗粒。
   ============================================================ */

:root {
  --bg: #0b0c10;
  --bg-soft: #101117;
  --panel: #14151a;
  --panel-2: #191a21;
  --border: #26282f;
  --border-hi: #3a3d47;
  --text: #eceef4;
  --muted: #9ca3b0;
  --faint: #6b7280;
  --primary: #6366f1;
  --primary-hi: #818cf8;
  --violet: #a855f7;
  --magenta: #ec4899;
  --grad: linear-gradient(100deg, #818cf8 0%, #a855f7 48%, #ec4899 100%);
  --radius: 14px;
  --shadow-deep: 0 30px 80px -20px rgba(0, 0, 0, .65);
  --glow: 0 0 60px -12px rgba(99, 102, 241, .45);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --en: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--en);
  font-family: var(--zh);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

html[lang="en"] body { font-family: var(--en); letter-spacing: .1px; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

::selection { background: rgba(99, 102, 241, .4); }

/* ---------- 电影颗粒 ---------- */
.grain {
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none; z-index: 60;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 9s steps(10) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(-3%, 2%); }
  40% { transform: translate(2%, -3%); }
  60% { transform: translate(-2%, -2%); }
  80% { transform: translate(3%, 3%); }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  border-radius: 999px; font-weight: 600;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(120deg, #6366f1, #7c5cf6 55%, #9333ea);
  color: #fff;
  box-shadow: 0 8px 28px -8px rgba(99, 102, 241, .65);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 38px -8px rgba(124, 92, 246, .75); }
.btn-ghost {
  border: 1px solid var(--border-hi);
  background: rgba(20, 21, 26, .5);
  backdrop-filter: blur(8px);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--primary-hi); transform: translateY(-2px); }
.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-xl { padding: 19px 44px; font-size: 18px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(11, 12, 16, .78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 28px;
  height: 68px;
  display: flex; align-items: center; gap: 36px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-icon { width: 30px; height: 30px; border-radius: 8px; }
.brand-name { font-weight: 700; font-size: 19px; letter-spacing: .2px; }
.brand-by { font-size: 12px; color: var(--faint); margin-top: 3px; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a {
  font-size: 14.5px; color: var(--muted);
  transition: color .2s;
}
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-btn {
  width: 38px; height: 38px; border-radius: 999px;
  border: 1px solid var(--border-hi);
  font-size: 13px; font-weight: 600; color: var(--muted);
  transition: color .2s, border-color .2s;
}
.lang-btn:hover { color: var(--text); border-color: var(--primary-hi); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: 68% 30%;
  animation: heroIn 2.4s var(--ease) both;
}
@keyframes heroIn { from { opacity: 0; transform: scale(1.06); } to { opacity: 1; transform: scale(1); } }
.hero-veil {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 12, 16, .96) 0%, rgba(11, 12, 16, .82) 34%, rgba(11, 12, 16, .25) 70%, rgba(11, 12, 16, .45) 100%),
    linear-gradient(180deg, rgba(11, 12, 16, .6) 0%, rgba(11, 12, 16, 0) 30%, rgba(11, 12, 16, 0) 62%, var(--bg) 100%);
}
.hero-inner { width: 100%; max-width: 1180px; margin: 0 auto; padding: 140px 28px 90px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 18px; border-radius: 999px;
  border: 1px solid rgba(129, 140, 248, .35);
  background: rgba(99, 102, 241, .1);
  color: #c7d2fe; font-size: 13.5px;
  margin-bottom: 30px;
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--primary-hi);
  box-shadow: 0 0 12px 2px rgba(129, 140, 248, .8);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.hero-title {
  font-size: clamp(42px, 6.6vw, 84px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: .5px;
  margin-bottom: 28px;
  text-wrap: balance;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  max-width: 560px;
  font-size: 17.5px; color: var(--muted);
  margin-bottom: 40px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 22px; }
.hero-meta { font-size: 13px; color: var(--faint); letter-spacing: .4px; }
.hero-shot { margin-top: 68px; }

/* ---------- 窗口 mockup ---------- */
.window {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-deep), var(--glow);
}
.window img { width: 100%; }

/* ---------- 能力带 ---------- */
.strip { border-block: 1px solid var(--border); background: var(--bg-soft); }
.strip-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding-top: 34px; padding-bottom: 34px; gap: 20px;
}
.strip-item { display: flex; gap: 15px; align-items: flex-start; }
.strip-ico {
  flex: none;
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 19px; color: var(--primary-hi);
  background: rgba(99, 102, 241, .12);
  border: 1px solid rgba(99, 102, 241, .3);
}
.strip-item b { display: block; font-size: 15.5px; }
.strip-item span { font-size: 13px; color: var(--muted); }

/* ---------- 通用 Section ---------- */
.section { padding: 118px 0; position: relative; }
.section.alt {
  background:
    radial-gradient(900px 420px at 85% 0%, rgba(99, 102, 241, .07), transparent 60%),
    var(--bg-soft);
  border-block: 1px solid var(--border);
}
.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: 2.5px;
  color: var(--primary-hi); text-transform: uppercase;
  margin-bottom: 16px;
}
.section h2 {
  font-size: clamp(30px, 4vw, 50px);
  font-weight: 800; line-height: 1.25; letter-spacing: .5px;
  margin-bottom: 18px;
  text-wrap: balance;
}
.section-sub { max-width: 640px; color: var(--muted); font-size: 16.5px; margin-bottom: 56px; }

/* ---------- Pipeline ---------- */
.pipeline {
  position: relative;
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px;
  margin-bottom: 72px;
}
.pipeline::before {
  content: ""; position: absolute; top: 21px; left: 4%; right: 4%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(129, 140, 248, .5) 12%, rgba(168, 85, 247, .5) 60%, transparent);
}
.pipe-step { position: relative; padding-top: 0; }
.pipe-step i {
  position: relative; z-index: 1;
  display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 50%;
  font-style: normal; font-weight: 700; font-size: 15px;
  color: #c7d2fe;
  background: var(--panel);
  border: 1px solid rgba(129, 140, 248, .5);
  box-shadow: 0 0 18px -4px rgba(99, 102, 241, .55);
  margin-bottom: 16px;
}
.pipe-step b { display: block; font-size: 15.5px; margin-bottom: 5px; }
.pipe-step span { font-size: 13px; color: var(--muted); line-height: 1.55; display: block; }

/* ---------- 左右分栏 ---------- */
.split { display: grid; grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: center; }
.split-shot { transition: transform .4s var(--ease); }
.split-shot:hover { transform: translateY(-4px); }
.ticks { list-style: none; display: grid; gap: 18px; }
.ticks li {
  position: relative; padding-left: 34px;
  color: #cdd2dd; font-size: 15.5px;
}
.ticks li::before {
  content: "✓";
  position: absolute; left: 0; top: 1px;
  width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 12px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
}

/* ---------- 功能卡 ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 64px; }
.cards.four { grid-template-columns: repeat(4, 1fr); margin-bottom: 0; }
.card {
  padding: 28px 26px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
}
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(129, 140, 248, .55);
  box-shadow: 0 18px 44px -18px rgba(99, 102, 241, .4);
}
.card-ico {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 20px; color: var(--primary-hi);
  background: rgba(99, 102, 241, .12);
  border: 1px solid rgba(99, 102, 241, .3);
  margin-bottom: 18px;
}
.card b { display: block; font-size: 16.5px; margin-bottom: 8px; }
.card span { font-size: 14px; color: var(--muted); line-height: 1.65; }
.split-shot.wide { margin-top: 8px; }

/* ---------- 画廊 ---------- */
.gal { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.gal-v { display: flex; justify-content: center; gap: 16px; margin-top: 16px; }
.gal-item {
  position: relative; display: block; padding: 0;
  border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 16 / 9;
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.gal-v .gal-item { aspect-ratio: 9 / 14.2; flex: 0 1 300px; }
.gal-item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .6s var(--ease);
}
.gal-item:hover { border-color: rgba(129, 140, 248, .6); transform: translateY(-4px); box-shadow: var(--glow); }
.gal-item:hover img { transform: scale(1.05); }
.gal-cap {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 34px 16px 13px;
  font-size: 13.5px; color: #e5e7ee; text-align: left;
  background: linear-gradient(180deg, transparent, rgba(5, 6, 9, .85));
  opacity: 0; transform: translateY(8px);
  transition: opacity .35s, transform .35s var(--ease);
}
.gal-item:hover .gal-cap { opacity: 1; transform: translateY(0); }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 100;
  display: grid; place-items: center;
  background: rgba(6, 7, 10, .88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 4vh 4vw;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: 100%; max-height: 100%;
  border-radius: 10px;
  box-shadow: var(--shadow-deep);
}
.lightbox-close {
  position: absolute; top: 22px; right: 30px;
  width: 44px; height: 44px; border-radius: 50%;
  font-size: 26px; line-height: 1;
  color: var(--muted);
  border: 1px solid var(--border-hi);
  background: rgba(20, 21, 26, .7);
  transition: color .2s, border-color .2s;
}
.lightbox-close:hover { color: var(--text); border-color: var(--primary-hi); }

/* ---------- 三步 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step {
  position: relative;
  padding: 34px 30px 30px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.step i {
  position: absolute; right: 14px; top: -14px;
  font-style: normal;
  font-size: 110px; font-weight: 800; line-height: 1;
  color: rgba(129, 140, 248, .08);
}
.step b { display: block; font-size: 17px; margin-bottom: 8px; }
.step span { font-size: 14px; color: var(--muted); }

/* ---------- 下载 CTA ---------- */
.cta { position: relative; padding: 150px 0; overflow: hidden; text-align: center; }
.cta-bg { position: absolute; inset: 0; z-index: -1; }
.cta-bg img { width: 100%; height: 100%; object-fit: cover; }
.cta-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(720px 300px at 50% 62%, rgba(99, 102, 241, .16), transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, rgba(11, 12, 16, .55) 30%, rgba(11, 12, 16, .55) 70%, var(--bg) 100%);
}
.cta h2 {
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 800; letter-spacing: 1px;
  margin-bottom: 16px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, .6);
}
.cta p { color: #b6bcc9; font-size: 17px; margin-bottom: 42px; }
.cta-note { margin-top: 22px; font-size: 13px; color: var(--faint) !important; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 54px 0 34px; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 28px;
  align-items: center; justify-content: space-between;
  padding-bottom: 30px; margin-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-brand img { width: 42px; height: 42px; border-radius: 10px; }
.footer-brand b { display: block; font-size: 17px; }
.footer-brand span { font-size: 13px; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-links a { font-size: 14px; color: var(--muted); transition: color .2s; }
.footer-links a:hover { color: var(--text); }
.footer-base {
  display: flex; flex-wrap: wrap; gap: 14px;
  justify-content: space-between;
  font-size: 12.5px; color: var(--faint);
}

/* ---------- Reveal 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .grain { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .strip-grid { grid-template-columns: repeat(2, 1fr); gap: 26px 20px; }
  .pipeline { grid-template-columns: repeat(3, 1fr); gap: 30px 18px; }
  .pipeline::before { display: none; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .cards.four { grid-template-columns: repeat(2, 1fr); }
  .gal { grid-template-columns: repeat(2, 1fr); }
  .gal-v { flex-wrap: wrap; }
  .gal-v .gal-item { flex-basis: 260px; }
  .nav-links { display: none; }
  .hero-bg img { object-position: 72% 20%; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .section { padding: 84px 0; }
  .hero-inner { padding: 120px 20px 70px; }
  .hero-sub { font-size: 16px; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .strip-grid { grid-template-columns: 1fr; }
  .pipeline { grid-template-columns: 1fr 1fr; }
  .cards, .cards.four { grid-template-columns: 1fr; }
  .gal { grid-template-columns: 1fr; }
  .gal-v { flex-direction: column; align-items: center; }
  .gal-v .gal-item { flex-basis: auto; width: 100%; max-width: 340px; }
  .steps { grid-template-columns: 1fr; }
  .cta { padding: 110px 0; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .brand-by { display: none; }
  .gal-cap { opacity: 1; transform: none; }
}