/* ========================================
   AI中药鉴定 - 公共样式系统
   ======================================== */

/* CSS 变量 - 中药主题配色 */
:root {
  --primary: #2D6A4F;
  --primary-light: #40916C;
  --primary-lighter: #52B788;
  --primary-lightest: #B7E4C7;
  --primary-bg: #D8F3DC;
  --primary-dark: #1B4332;
  --primary-darker: #081C15;

  --accent: #D4A373;
  --accent-light: #E9C89B;
  --accent-dark: #B07D3E;

  --gold: #C9A84C;
  --gold-light: #E8D48B;
  --gold-dark: #8B6914;

  --red: #C44536;
  --red-light: #E76F51;

  --bg-white: #FFFFFF;
  --bg-light: #F8F9FA;
  --bg-cream: #FDF8F0;
  --bg-green-light: #F0F7F4;

  --text-primary: #1A1A2E;
  --text-secondary: #4A4A5A;
  --text-muted: #7A7A8A;
  --text-light: #A0A0B0;

  --border-light: #E8E8E8;
  --border-medium: #D0D0D0;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition: all 0.3s ease;
  --transition-fast: all 0.15s ease;

  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --container-max: 1200px;
  --nav-height: 72px;
}

/* 重置样式 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol { list-style: none; }

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  border: none;
  outline: none;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.nav-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  font-family: var(--font-serif);
}

.nav-logo span {
  font-family: var(--font-serif);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  background: var(--primary);
  color: white !important;
  padding: 8px 20px !important;
  border-radius: var(--radius-sm);
  font-weight: 500 !important;
  transition: var(--transition) !important;
}

.nav-cta:hover {
  background: var(--primary-dark) !important;
}

.nav-cta::after {
  display: none !important;
}

/* 移动端菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========================================
   通用组件
   ======================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(45, 106, 79, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-1px);
}

.btn-white {
  background: white;
  color: var(--primary);
}

.btn-white:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-lg {
  padding: 14px 36px;
  font-size: 16px;
}

/* 卡片 */
.card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 28px;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--primary-lightest);
}

/* 图标容器 */
.icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.icon-box.green {
  background: var(--primary-bg);
  color: var(--primary);
}

.icon-box.gold {
  background: #FEF3C7;
  color: var(--gold-dark);
}

.icon-box.red {
  background: #FEE2E2;
  color: var(--red);
}

.icon-box.blue {
  background: #DBEAFE;
  color: #1D4ED8;
}

/* 网格布局 */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--primary-darker);
  color: rgba(255, 255, 255, 0.8);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: white;
  margin-bottom: 16px;
}

.footer-brand .footer-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
  opacity: 0.7;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
}

.footer-col h4 {
  color: white;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  opacity: 0.65;
  transition: var(--transition-fast);
}

.footer-col ul li a:hover {
  opacity: 1;
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  opacity: 0.5;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-toggle {
    display: flex;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 48px 0;
  }
  .section-title {
    font-size: 28px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

/* 动画 */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* 滚动触发动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 装饰元素 */
.chinese-pattern {
  position: absolute;
  width: 200px;
  height: 200px;
  opacity: 0.03;
  pointer-events: none;
}

/* 药材标签 */
.herb-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.herb-tag.warm { background: #FEE2E2; color: #991B1B; }
.herb-tag.cool { background: #DBEAFE; color: #1E40AF; }
.herb-tag.neutral { background: #FEF3C7; color: #92400E; }
.herb-tag.toxic { background: #FEE2E2; color: #991B1B; }
.herb-tag.rare { background: #F3E8FF; color: #6B21A8; }

/* 徽章 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-green { background: var(--primary-bg); color: var(--primary); }
.badge-gold { background: #FEF3C7; color: #92400E; }
.badge-red { background: #FEE2E2; color: #991B1B; }
.badge-blue { background: #DBEAFE; color: #1D4ED8; }

/* 分割线 */
.divider {
  width: 60px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  margin: 16px auto;
}