/* === 知体 AI 官网样式 - 深蓝+浅金 极简医疗风（紧凑版） === */
/* === CSS Variables === */
:root {
  --primary: #1A3A5C;
  --primary-dark: #0F2440;
  --primary-light: #2C5F8A;
  --gold: #C9A96E;
  --gold-light: #E8D5B0;
  --gold-surface: #FAF5EB;
  --gold-text: #8B7355;
  --white: #FFFFFF;
  --bg: #F7F8FA;
  --card: #FFFFFF;
  --border: #E8ECF0;
  --text: #1A1A2E;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;
  --success: #4CAF50;
  --warning: #FF9800;
  --error: #E53935;
  --shadow: 0 4px 24px rgba(26, 58, 92, 0.08);
  --radius: 14px;
  --radius-sm: 8px;
  --max-width: 1200px;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.5;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* === Header === */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); transition: box-shadow 0.3s;
}
.header.scrolled { box-shadow: var(--shadow); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.logo-icon { font-size: 24px; }
.logo-text { color: var(--primary); }
.logo-img { width: 32px; height: 32px; object-fit: contain; }
.nav { display: flex; gap: 24px; }
.nav a { color: var(--text-secondary); font-size: 14px; transition: color 0.2s; }
.nav a:hover { color: var(--gold); }
.menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); }

/* === Hero === */
.hero {
  padding: 100px 0 60px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 60%, #0a1a30 100%);
  color: var(--white); position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(201,169,110,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner { display: flex; align-items: center; gap: 48px; position: relative; z-index: 1; }
.hero-content { flex: 1; }
.hero-title { margin-bottom: 8px; }
.hero-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.hero-logo-img { width: 48px; height: 48px; object-fit: contain; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2)); }
.hero-logo { font-size: 44px; font-weight: 800; color: var(--gold); letter-spacing: 4px; }
.hero-slogan { font-size: 20px; color: var(--gold-light); margin-bottom: 16px; font-weight: 300; letter-spacing: 5px; }
.hero-desc { font-size: 15px; line-height: 1.7; opacity: 0.9; margin-bottom: 14px; }
.hero-note { font-size: 11px; color: var(--gold-light); opacity: 0.7; margin-bottom: 28px; line-height: 1.6; }
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 999px; font-size: 15px; font-weight: 600; transition: all 0.3s; cursor: pointer; text-align: center; }
.btn-primary { background: var(--gold); color: var(--primary-dark); }
.btn-primary:hover { background: var(--gold-light); transform: translateY(-2px); }
.btn-secondary { background: rgba(255,255,255,0.15); color: var(--white); border: 1px solid rgba(255,255,255,0.3); }
.btn-secondary:hover { background: rgba(255,255,255,0.25); transform: translateY(-2px); }

.hero-visual { flex-shrink: 0; }
.hero-phone-mock {
  width: 230px; height: 460px; background: #111; border-radius: 32px;
  padding: 10px; box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.phone-screen {
  width: 100%; height: 100%; background: var(--primary);
  border-radius: 24px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 20px;
}
.phone-logo { font-size: 22px; font-weight: 700; color: var(--gold); margin-bottom: 20px; }
.phone-logo-img { width: 64px; height: 64px; object-fit: contain; margin-bottom: 16px; filter: drop-shadow(0 2px 6px rgba(0,0,0,0.25)); }
.phone-modules { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.phone-module {
  width: 90px; padding: 10px 6px; background: rgba(255,255,255,0.1);
  border-radius: 10px; text-align: center; font-size: 12px; color: var(--white);
}

/* === Sections Common === */
.section-title { font-size: 32px; font-weight: 700; text-align: center; color: var(--primary); margin-bottom: 8px; }
.section-subtitle { font-size: 15px; color: var(--text-secondary); text-align: center; max-width: 600px; margin: 0 auto 32px; }

/* === Features === */
.features { padding: 60px 0; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card {
  background: var(--card); border-radius: var(--radius); padding: 24px 20px;
  box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: 0 6px 24px rgba(26,58,92,0.1); }
.feature-icon { font-size: 34px; margin-bottom: 12px; }
.feature-card h3 { font-size: 18px; color: var(--primary); margin-bottom: 8px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* === Modules Pipeline === */
.modules { padding: 60px 0; background: var(--white); }
.pipeline { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; }
.pipeline-step {
  background: var(--card); border: 2px solid var(--border); border-radius: var(--radius);
  padding: 16px 14px; text-align: center; min-width: 110px; transition: all 0.3s;
}
.pipeline-step:hover { border-color: var(--gold); }
.pipeline-step.highlight { border-color: var(--gold); background: var(--gold-surface); }
.pipeline-num {
  width: 30px; height: 30px; border-radius: 50%; background: var(--primary);
  color: var(--gold); display: flex; align-items: center; justify-content: center;
  font-weight: 700; margin: 0 auto 8px; font-size: 14px;
}
.pipeline-step h4 { font-size: 14px; color: var(--text); margin-bottom: 3px; }
.pipeline-step p { font-size: 11px; color: var(--text-secondary); }
.pipeline-arrow { font-size: 20px; color: var(--gold); font-weight: 700; }
.pipeline-end { display: flex; justify-content: center; margin-bottom: 32px; }
.pipeline-end .pipeline-step { min-width: 220px; padding: 24px; }

.report-stages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stage-card {
  padding: 24px 16px; border-radius: var(--radius); text-align: center;
  border: 2px solid transparent; transition: all 0.3s;
}
.stage-card:hover { transform: translateY(-3px); }
.stage-short { background: #FFF3E0; border-color: var(--warning); }
.stage-mid { background: #E8F0F8; border-color: var(--primary-light); }
.stage-long { background: #E8F5E9; border-color: var(--success); }
.stage-card h4 { font-size: 24px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.stage-card p { font-size: 17px; font-weight: 600; color: var(--primary); margin-bottom: 6px; }
.stage-card span { font-size: 13px; color: var(--text-secondary); }

/* === Advantages === */
.advantages { padding: 60px 0; }
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.advantage-card {
  background: var(--card); border-radius: var(--radius); padding: 24px 20px;
  box-shadow: var(--shadow); text-align: center; transition: all 0.3s;
}
.advantage-card:hover { transform: translateY(-3px); box-shadow: 0 6px 24px rgba(26,58,92,0.1); }
.adv-icon { font-size: 40px; margin-bottom: 12px; }
.advantage-card h3 { font-size: 18px; color: var(--primary); margin-bottom: 8px; }
.advantage-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* === Download === */
.download { padding: 60px 0; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: var(--white); }
.download .section-title { color: var(--gold); margin-bottom: 0; }
.download .section-subtitle { color: var(--gold-light); }
.download-brand { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 8px; }
.download-logo-img { width: 40px; height: 40px; object-fit: contain; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2)); }
.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; max-width: 640px; margin: 0 auto; }
.download-card {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius); padding: 32px 24px; text-align: center; transition: all 0.3s;
}
.download-card:hover { background: rgba(255,255,255,0.12); transform: translateY(-3px); }
.download-platform { font-size: 40px; margin-bottom: 12px; }
.download-card h3 { font-size: 20px; margin-bottom: 8px; }
.download-card p { font-size: 13px; opacity: 0.8; margin-bottom: 18px; line-height: 1.6; }
.download-card .btn { width: 100%; }
.download-note { font-size: 11px; opacity: 0.5; margin-top: 10px; }

/* === Disclaimer === */
.disclaimer-section { padding: 50px 0; background: var(--gold-surface); }
.disclaimer-full {
  max-width: 800px; margin: 0 auto; text-align: center;
  border-left: 4px solid var(--gold); padding: 24px; background: var(--card);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.disclaimer-full h3 { font-size: 16px; color: var(--gold-text); margin-bottom: 12px; }
.disclaimer-full p { font-size: 13px; color: var(--gold-text); line-height: 1.7; }

/* === Footer === */
.footer { background: var(--primary-dark); color: var(--white); padding: 40px 0 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 36px; margin-bottom: 24px; }
.footer-brand p { opacity: 0.6; font-size: 13px; margin-top: 6px; }
.footer-links { display: flex; gap: 48px; }
.footer-col h4 { font-size: 15px; color: var(--gold); margin-bottom: 12px; }
.footer-col a { display: block; font-size: 13px; opacity: 0.6; margin-bottom: 6px; transition: opacity 0.2s; }
.footer-col a:hover { opacity: 1; color: var(--gold-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding: 16px 0;
  text-align: center; font-size: 12px; opacity: 0.4;
}

/* === Responsive === */
@media (max-width: 1024px) {
  .features-grid, .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .pipeline { gap: 4px; }
  .pipeline-step { min-width: 90px; padding: 12px 10px; }
  .pipeline-arrow { font-size: 14px; }
}
@media (max-width: 768px) {
  .hero { padding: 80px 0 40px; }
  .hero-inner { flex-direction: column; text-align: center; gap: 32px; }
  .hero-brand { justify-content: center; }
  .hero-logo-img { width: 40px; height: 40px; }
  .hero-logo { font-size: 32px; }
  .hero-slogan { font-size: 16px; }
  .hero-buttons { justify-content: center; }
  .hero-phone-mock { width: 180px; height: 360px; }
  .features-grid, .advantages-grid, .report-stages { grid-template-columns: 1fr; }
  .pipeline { flex-direction: column; }
  .pipeline-arrow { transform: rotate(90deg); }
  .download-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 24px; }
  .footer-links { gap: 24px; flex-wrap: wrap; }
  .nav { display: none; position: absolute; top: 52px; left: 0; right: 0;
    background: var(--white); flex-direction: column; padding: 12px 24px;
    box-shadow: var(--shadow); gap: 10px;
  }
  .nav.open { display: flex; }
  .menu-toggle { display: block; }
  .section-title { font-size: 26px; }
  .features, .advantages, .modules, .download { padding: 40px 0; }
}
@media (max-width: 480px) {
  .hero-logo { font-size: 26px; letter-spacing: 2px; }
  .hero-slogan { font-size: 14px; letter-spacing: 2px; }
  .hero-desc { font-size: 13px; }
  .container { padding: 0 16px; }
}

/* === Animations === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-content { animation: fadeInUp 0.6s ease-out; }
.feature-card, .advantage-card, .stage-card { animation: fadeInUp 0.5s ease-out; }