/* 基础样式：现代科技公司风格，简洁、对比明确、响应式 */

:root {
  --bg: #0b0c10;
  --card: #111217;
  --elev: #161821;
  --text: #e6e8ec;
  --subtle: #b8bcc6;
  --brand: #0a84ff;
  --brand-weak: #2b95ff33;
  --border: #2a2e39;
  --ok: #22c55e;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, #0a84ff0f, transparent 60%),
              radial-gradient(800px 400px at 90% 0%, #2b95ff1a, transparent 60%),
              var(--bg);
  line-height: 1.6;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(8px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--text);
  text-decoration: none;
}
.brand-mark { font-size: 20px; }
.brand-name { font-weight: 600; letter-spacing: .2px; }

.site-nav { position: relative; }
.nav-toggle {
  display: none;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 10px;
  border-radius: 9px;
}
.nav-menu {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-menu a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 9px;
}
.nav-menu a:hover { background: var(--brand-weak); }

/* Hero */
.hero { position: relative; overflow: clip; }
.hero-inner {
  padding: 96px 0 72px;
  text-align: center;
}
.hero-title {
  margin: 0 0 12px;
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.15;
}
.hero-subtitle {
  margin: 0 auto 28px;
  color: var(--subtle);
  max-width: 720px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; }
.hero-bg {
  position: absolute;
  inset: -10% -10% auto -10%;
  height: 420px;
  background:
    radial-gradient(400px 200px at 20% 60%, #0a84ff22, transparent 60%),
    radial-gradient(300px 160px at 80% 40%, #2b95ff22, transparent 60%);
  pointer-events: none;
  filter: blur(40px) saturate(140%);
}

/* Section 通用 */
.section { padding: 64px 0; }
.section.alt { background: linear-gradient(180deg, #0a0b10, #0c0d12); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title { margin: 0 0 10px; font-size: 24px; }
.section-subtitle { margin: 0 0 28px; color: var(--subtle); }

/* 卡片与网格 */
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background: linear-gradient(180deg, var(--card), var(--elev));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 4px 0 8px; font-size: 18px; }
.card p { margin: 0 0 12px; color: var(--subtle); }
.list { margin: 0; padding: 0 0 0 16px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  background: #ffffff05;
}
.btn:hover { background: #ffffff0f; }
.btn-primary { border-color: transparent; background: var(--brand); color: white; box-shadow: 0 6px 20px #0a84ff55; }
.btn-primary:hover { filter: brightness(1.05); }
.btn-ghost { background: transparent; }

/* About/Careers/Contact 特性 */
.about-text { color: var(--subtle); max-width: 840px; }
.contact-block { background: linear-gradient(180deg, var(--card), #0f1016); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.contact-block a { color: var(--text); text-decoration: none; }
.contact-block a:hover { color: var(--brand); }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner { display: grid; gap: 12px; align-items: center; grid-template-columns: 1fr auto; }
.footer-brand { margin: 0; color: var(--subtle); }
.footer-links { list-style: none; display: flex; gap: 14px; margin: 0; padding: 0; }
.footer-links a { color: var(--subtle); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.icp { margin: 0; text-align: right; }
.icp a { color: var(--subtle); text-decoration: none; }
.icp a:hover { color: var(--text); }

/* 响应式 */
@media (max-width: 960px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .header-inner { padding: 12px 0; }
  .nav-toggle { display: inline-flex; }
  .nav-menu { position: absolute; right: 0; top: calc(100% + 8px); background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px; box-shadow: var(--shadow); display: none; flex-direction: column; min-width: 200px; }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 10px 12px; }
  .grid.two, .cards { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .icp { text-align: center; }
}