/* ============================================================
   柠檬虾官网 · 深色科技 + 橙色品牌 + 玻璃拟态
   ============================================================ */
:root {
  --bg: #0c0e13;
  --bg-2: #11141b;
  --ink: #f4f6fa;
  --ink-2: #a8b0bf;
  --ink-3: #6b7280;
  --brand: #ff7a1a;
  --brand-2: #ff9a3d;
  --lemon: #ffd23f;
  --grad: linear-gradient(135deg, #ff7a1a 0%, #ffb02e 100%);
  --card: rgba(255, 255, 255, 0.045);
  --card-border: rgba(255, 255, 255, 0.09);
  --radius: 18px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* 背景光晕 */
.glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden;
}
.glow::before, .glow::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.5;
}
.glow::before {
  width: 620px; height: 620px; top: -220px; right: -120px;
  background: radial-gradient(circle, #ff7a1a, transparent 70%);
}
.glow::after {
  width: 520px; height: 520px; top: 320px; left: -180px;
  background: radial-gradient(circle, #ff9a3d33, transparent 70%);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 10px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: all .22s ease; white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #241203; box-shadow: 0 10px 26px rgba(255,122,26,.32); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(255,122,26,.42); }
.btn-ghost { background: rgba(255,255,255,.06); color: var(--ink); border-color: var(--card-border); }
.btn-ghost:hover { background: rgba(255,255,255,.11); transform: translateY(-2px); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  backdrop-filter: blur(16px); background: rgba(12,14,19,.72);
  border-bottom: 1px solid var(--card-border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 40px; height: 40px; border-radius: 11px; background: #fff; padding: 3px; }
.brand b { font-size: 19px; letter-spacing: .5px; }
.brand small { display: block; font-size: 11px; color: var(--ink-2); font-weight: 400; letter-spacing: 2px; }
.nav-links { display: flex; gap: 30px; font-size: 15px; color: var(--ink-2); }
.nav-links a:hover { color: var(--ink); }
.nav .btn { padding: 10px 20px; }

/* ---------- Hero ---------- */
.hero { padding: 168px 0 90px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--brand-2);
  background: rgba(255,122,26,.1); border: 1px solid rgba(255,122,26,.25);
  padding: 7px 15px; border-radius: 100px; margin-bottom: 24px;
}
.hero h1 { font-size: 56px; line-height: 1.12; font-weight: 800; letter-spacing: -1px; }
.hero h1 .ac { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { margin: 24px 0 34px; font-size: 18px; color: var(--ink-2); max-width: 520px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 26px; margin-top: 38px; flex-wrap: wrap; }
.hero-meta div { font-size: 14px; color: var(--ink-2); }
.hero-meta b { display: block; font-size: 22px; color: var(--ink); font-weight: 700; }
.hero-shot {
  border-radius: 16px; border: 1px solid var(--card-border);
  box-shadow: var(--shadow); overflow: hidden; background: #fff;
  transform: perspective(1200px) rotateY(-7deg) rotateX(3deg);
}
.hero-shot img { mix-blend-mode: normal; }

/* ---------- 区块标题 ---------- */
.section { padding: 92px 0; }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 60px; }
.section-head .tag {
  font-size: 13px; color: var(--brand-2); letter-spacing: 3px; font-weight: 600;
}
.section-head h2 { font-size: 40px; font-weight: 800; margin: 14px 0 16px; letter-spacing: -.5px; }
.section-head p { color: var(--ink-2); font-size: 17px; }

/* ---------- 功能卡片 ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feat {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .25s ease, border-color .25s ease;
}
.feat:hover { transform: translateY(-6px); border-color: rgba(255,122,26,.35); }
.feat .ico {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  background: rgba(255,122,26,.14); font-size: 24px; margin-bottom: 18px;
}
.feat h3 { font-size: 19px; margin-bottom: 10px; }
.feat p { color: var(--ink-2); font-size: 14.5px; }

/* ---------- 产品展示（交替） ---------- */
.show-row { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 90px; }
.show-row:last-child { margin-bottom: 0; }
.show-row.flip .show-text { order: 2; }
.show-shot {
  border-radius: 16px; overflow: hidden; border: 1px solid var(--card-border);
  box-shadow: var(--shadow); background: #fff;
}
.show-text .num {
  font-size: 14px; font-weight: 700; color: var(--brand-2); letter-spacing: 1px;
}
.show-text h3 { font-size: 30px; margin: 12px 0 16px; font-weight: 800; }
.show-text p { color: var(--ink-2); font-size: 16px; margin-bottom: 20px; }
.show-list { list-style: none; }
.show-list li { padding: 8px 0 8px 30px; position: relative; color: var(--ink); font-size: 15px; }
.show-list li::before {
  content: "✓"; position: absolute; left: 0; top: 8px; color: #fff;
  background: var(--grad); width: 20px; height: 20px; border-radius: 50%;
  font-size: 12px; display: grid; place-items: center; font-weight: 700;
}

/* ---------- 下载 ---------- */
.download {
  background: linear-gradient(135deg, rgba(255,122,26,.14), rgba(255,176,46,.06));
  border: 1px solid rgba(255,122,26,.28); border-radius: 26px;
  padding: 64px 48px; text-align: center;
}
.download h2 { font-size: 38px; font-weight: 800; margin-bottom: 14px; }
.download p { color: var(--ink-2); font-size: 17px; max-width: 600px; margin: 0 auto 34px; }
.download-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.download-note { margin-top: 26px; font-size: 13.5px; color: var(--ink-3); }
.download-note span { margin: 0 10px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--card-border); padding: 56px 0 34px; margin-top: 40px; }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; margin-bottom: 36px; }
.footer-brand { display: flex; gap: 12px; align-items: center; }
.footer-brand img { width: 38px; height: 38px; border-radius: 10px; background: #fff; padding: 3px; }
.footer-brand b { font-size: 17px; }
.footer-cols { display: flex; gap: 70px; }
.footer-col h4 { font-size: 14px; margin-bottom: 14px; color: var(--ink); }
.footer-col a { display: block; color: var(--ink-2); font-size: 14px; margin-bottom: 9px; }
.footer-col a:hover { color: var(--brand-2); }
.footer-beian {
  border-top: 1px solid var(--card-border); padding-top: 24px; text-align: center;
  font-size: 13.5px; color: var(--ink-2);
}
.footer-beian a { color: var(--ink-2); }
.footer-beian a:hover { color: var(--brand-2); }
.footer-beian .sep { margin: 0 12px; color: var(--ink-3); }
.footer-copy { margin-top: 12px; font-size: 12.5px; color: var(--ink-3); }

/* ---------- 动画（默认可见，仅 JS 给 .pre 时才隐藏，避免 JS 失败内容消失） ---------- */
.reveal { transition: opacity .7s ease, transform .7s ease; }
.reveal.pre { opacity: 0; transform: translateY(28px); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .nav-links { display: none; }
  .hero-grid, .show-row { grid-template-columns: 1fr; gap: 40px; }
  .show-row.flip .show-text { order: 0; }
  .hero h1 { font-size: 42px; }
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .hero-shot { transform: none; }
  .section-head h2, .download h2 { font-size: 30px; }
}
@media (max-width: 600px) {
  .feat-grid { grid-template-columns: 1fr; }
  .hero { padding: 130px 0 60px; }
  .download { padding: 44px 24px; }
  .footer-cols { gap: 40px; }
}