/* ============================================
   龙呤AI 独立站样式
   文件名称：style.css
   文件路径：D:\LongLing_AI_1.5\豆包-Workspace\deliverables\独立站\site\css\style.css
   开发日期：2026-10-13
   更新日期：2026-10-13
   ============================================ */

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

:root {
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --card: #111c30;
  --border: #1e2c44;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --primary: #38bdf8;
  --primary-2: #0ea5e9;
  --accent: #818cf8;
  --radius: 14px;
}

html { scroll-behavior:smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top:0; z-index:100;
  background: rgba(11,18,32,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin:0 auto; padding:0 20px;
  height: 62px; display:flex; align-items:center; justify-content:space-between;
}
.logo { font-size: 22px; font-weight:700; letter-spacing:1px; }
.logo span { color: var(--primary); }
.menu { display:flex; gap:26px; }
.menu a { font-size:14px; color:var(--text-dim); transition:color .2s; }
.menu a:hover, .menu a.active { color: var(--primary); }
.menu-toggle { display:none; background:none; border:none; color:var(--text); font-size:22px; cursor:pointer; }

/* ---------- Hero ---------- */
.hero { position:relative; overflow:hidden; padding:96px 20px 72px; text-align:center; }
.hero-bg {
  position:absolute; inset:0; z-index:0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 20%, rgba(56,189,248,.14), transparent),
    radial-gradient(ellipse 50% 45% at 80% 30%, rgba(129,140,248,.12), transparent),
    linear-gradient(180deg, #0d1728, var(--bg));
}
.hero-inner { position:relative; z-index:1; max-width:760px; margin:0 auto; }
.hero-badge {
  display:inline-block; padding:5px 16px; border-radius:20px;
  font-size:13px; color:var(--primary);
  border:1px solid rgba(56,189,248,.35);
  background:rgba(56,189,248,.08);
  margin-bottom:22px;
}
.hero-title { font-size:52px; line-height:1.2; font-weight:800; letter-spacing:2px; }
.hero-title span {
  display:block; font-size:30px; font-weight:600; margin-top:10px;
  background:linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.hero-sub { margin:22px auto 32px; font-size:17px; color:var(--text-dim); max-width:520px; }
.hero-actions { display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }
.hero-meta { margin-top:36px; font-size:13px; color:var(--text-dim); display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }
.hero-meta i { color:var(--border); }

/* ---------- 按钮 ---------- */
.btn {
  display:inline-block; padding:12px 28px; border-radius:999px;
  font-size:15px; font-weight:600; transition:all .2s; cursor:pointer;
}
.btn-primary {
  background:linear-gradient(135deg, var(--primary), var(--primary-2));
  color:#062031; box-shadow:0 8px 24px rgba(14,165,233,.25);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 12px 30px rgba(14,165,233,.35); }
.btn-ghost { border:1px solid var(--border); color:var(--text-dim); }
.btn-ghost:hover { border-color:var(--primary); color:var(--primary); }
.btn-lg { padding:14px 38px; font-size:16px; }

/* ---------- 通用区块 ---------- */
.section { padding:72px 20px; }
.section-alt { background:var(--bg-alt); }
.section-head { text-align:center; max-width:640px; margin:0 auto 48px; }
.section-head h2 { font-size:30px; font-weight:700; }
.section-head p { margin-top:10px; color:var(--text-dim); font-size:15px; }

/* ---------- 卖点 ---------- */
.features { max-width:1080px; margin:0 auto; display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.feature {
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:32px 26px; transition:all .25s;
}
.feature:hover { transform:translateY(-4px); border-color:rgba(56,189,248,.4); }
.feature-icon { font-size:34px; margin-bottom:16px; }
.feature h3 { font-size:18px; margin-bottom:10px; }
.feature p { font-size:14px; color:var(--text-dim); }

/* ---------- 场景 ---------- */
.scenarios { max-width:1080px; margin:0 auto; display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.scenario {
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius); padding:28px 24px;
}
.scenario h4 { font-size:17px; margin-bottom:10px; color:var(--primary); }
.scenario p { font-size:14px; color:var(--text-dim); }

/* ---------- CTA ---------- */
.cta { padding:72px 20px; text-align:center;
  background:linear-gradient(180deg, var(--bg), #0d1b33);
}
.cta-inner { max-width:640px; margin:0 auto; }
.cta h2 { font-size:28px; }
.cta p { margin:12px 0 26px; color:var(--text-dim); font-size:15px; }

/* ---------- 页脚 ---------- */
.footer { border-top:1px solid var(--border); padding:48px 20px 32px; }
.footer-inner { max-width:1080px; margin:0 auto; text-align:center; }
.footer-brand p { margin-top:6px; font-size:13px; color:var(--text-dim); }
.footer-links { display:flex; gap:22px; justify-content:center; margin:20px 0; font-size:14px; }
.footer-links a { color:var(--text-dim); }
.footer-links a:hover { color:var(--primary); }
.footer-org { font-size:12px; color:var(--text-dim); line-height:2; }
.footer-copy { margin-top:18px; font-size:12px; color:#475569; }

/* ---------- 响应式 ---------- */
@media (max-width: 820px) {
  .hero-title { font-size:38px; }
  .hero-title span { font-size:24px; }
  .features, .scenarios { grid-template-columns:1fr; }
  .menu {
    position:absolute; top:62px; left:0; right:0;
    flex-direction:column; gap:0; background:var(--bg);
    border-bottom:1px solid var(--border); display:none; padding:10px 0;
  }
  .menu.open { display:flex; }
  .menu a { padding:12px 24px; font-size:15px; }
  .menu-toggle { display:block; }
}

/* ============================================
   2026-10-19 正式页追加：两列分组 / FAQ / 状态提示
   配合 product/download/support/about/legal 正式版
   ============================================ */
.grid-2 { max-width:1080px; margin:0 auto; display:grid; grid-template-columns:repeat(2,1fr); gap:24px; }
.group-label { text-align:center; max-width:640px; margin:40px auto 24px; }
.group-label h3 { font-size:20px; font-weight:700; color:var(--primary); }
.group-label p { margin-top:6px; color:var(--text-dim); font-size:14px; }
.qna { max-width:760px; margin:0 auto; display:flex; flex-direction:column; gap:16px; }
.qna .feature { padding:22px 24px; }
.qna h3 { font-size:15px; color:var(--primary); margin-bottom:8px; }
.qna p { font-size:14px; color:var(--text-dim); }
.note { max-width:760px; margin:28px auto 0; padding:16px 20px; border:1px solid var(--border); border-left:3px solid var(--primary); border-radius:8px; font-size:13px; color:var(--text-dim); background:var(--card); }
@media (max-width: 820px) { .grid-2 { grid-template-columns:1fr; } }