/* 迅利量化 — 产品介绍首页 */
:root {
  --primary: #0f6cbd;
  --primary-dark: #0a4d8c;
  --accent: #2563eb;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f8fafc;
  --card: #ffffff;
  --gradient: linear-gradient(135deg, #0f6cbd 0%, #1d4ed8 55%, #312e81 100%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}
.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.logo span { color: var(--primary); }
.nav-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.lang-switch {
  position: relative;
  display: inline-flex;
  vertical-align: middle;
}
.lang-switch-face {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid #dadce0;
  border-radius: 8px;
  background: #f8f9fa;
  font-size: 13px;
  color: #5f6368;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}
.lang-switch-icon,
.lang-switch-chevron {
  flex-shrink: 0;
  display: block;
}
.lang-switch-name {
  white-space: nowrap;
}
.lang-switch-select {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  opacity: 0;
  cursor: pointer;
  font-size: 13px;
}
.btn {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: filter 0.15s;
}
.btn:hover { filter: brightness(1.06); text-decoration: none; }
.btn-outline {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  border: none;
  box-shadow: 0 4px 14px rgba(15,108,189,0.35);
}

/* Hero */
.hero {
  background: var(--gradient);
  color: #fff;
  padding: 72px 0 80px;
  text-align: center;
}
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.hero .tagline {
  font-size: clamp(16px, 2.5vw, 20px);
  opacity: 0.95;
  margin: 0 0 12px;
}
.hero .sub {
  font-size: 15px;
  opacity: 0.85;
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero .btn-primary {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  padding: 12px 28px;
  font-size: 16px;
}
.hero .btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.7);
}

/* 区块 */
section { padding: 64px 0; }
section.alt { background: #fff; }
.section-title {
  text-align: center;
  margin: 0 0 12px;
  font-size: 28px;
  font-weight: 700;
}
.section-desc {
  text-align: center;
  color: var(--muted);
  margin: 0 auto 40px;
  max-width: 560px;
  font-size: 15px;
}

/* 功能卡片 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px 24px;
  box-shadow: 0 2px 8px rgba(15,23,42,0.04);
  transition: box-shadow 0.2s, transform 0.2s;
}
.feature-card:hover {
  box-shadow: 0 8px 24px rgba(15,23,42,0.08);
  transform: translateY(-2px);
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 14px;
}
.feature-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}
.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
}

/* 重要功能 — 两列列表 */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.highlight-item {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  background: var(--bg);
  border-radius: 8px;
  border-left: 4px solid var(--primary);
}
.highlight-item h4 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
}
.highlight-item p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* 优势 */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.why-item { text-align: center; padding: 20px 16px; }
.why-item .icon { font-size: 32px; margin-bottom: 12px; }
.why-item h4 { margin: 0 0 8px; font-size: 16px; }
.why-item p { margin: 0; font-size: 13px; color: var(--muted); }

/* CTA */
.cta {
  background: var(--gradient);
  color: #fff;
  text-align: center;
  padding: 56px 20px;
}
.cta h2 { margin: 0 0 12px; font-size: 26px; }
.cta p { margin: 0 0 24px; opacity: 0.9; font-size: 15px; }

/* 部署方式 */
.deploy-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}
.deploy-box {
  flex: 1;
  min-width: 260px;
  max-width: 340px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
}
.deploy-box h4 { margin: 0 0 8px; font-size: 16px; }
.deploy-box p { margin: 0; font-size: 13px; color: var(--muted); }

/* 页脚 */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 32px 0;
  font-size: 13px;
  text-align: center;
}
.site-footer a { color: #cbd5e1; }

@media (max-width: 600px) {
  .hero { padding: 48px 0 56px; }
  section { padding: 44px 0; }
  .nav-actions .btn-outline { display: none; }
}