/* ========================================
   Carson Page - 通义千问风格
   浅色柔和 · 紫色渐变 · 玻璃态效果
   ======================================== */

:root {
  /* 浅色背景 */
  --bg-primary: #faf8ff;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f3ff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.7);

  /* 紫色主色调 */
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --primary-dark: #5b21b6;
  --primary-glow: rgba(124, 58, 237, 0.15);
  --primary-soft: rgba(124, 58, 237, 0.08);

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #7c3aed 0%, #a78bfa 100%);
  --gradient-hero: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #e0e7ff 100%);
  --gradient-text: linear-gradient(90deg, #7c3aed, #a78bfa);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(245,243,255,0.9) 100%);
  --gradient-bg: radial-gradient(ellipse at top, #f5f3ff 0%, #faf8ff 50%, #ffffff 100%);

  /* 文字颜色 */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;

  /* 边框 */
  --border: rgba(124, 58, 237, 0.15);
  --border-light: rgba(124, 58, 237, 0.08);

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 60px rgba(124, 58, 237, 0.1);
  --shadow-card: 0 4px 20px rgba(124, 58, 237, 0.08);

  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* 动画 */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  scroll-behavior: smooth;
  background: #faf8ff;
}

/* 动态背景 Canvas - 在 body 背景之上，内容之下 */
#bgCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', Roboto, sans-serif;
  background: transparent;
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 移除静态背景装饰，使用 canvas 动态效果 */
body::before {
  display: none;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-2%, -2%) rotate(1deg); }
}

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

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

/* ========================================
   布局组件
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  color: var(--text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

/* ========================================
   导航栏 - 毛玻璃效果
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-brand .logo {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.navbar-brand:hover {
  color: var(--primary);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
}

.navbar-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.navbar-nav a:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.navbar-nav a.active {
  color: var(--primary);
  background: var(--primary-soft);
  font-weight: 600;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
}

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

/* ========================================
   主内容区
   ======================================== */

main {
  padding-top: 72px;
  position: relative;
  z-index: 1;
}

/* ========================================
   Hero 区域 - 通义千问风格
   ======================================== */

.hero {
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
  position: relative;
  background: transparent;
  overflow: hidden;
}

/* 移除静态背景，使用 canvas 动态效果 */
.hero::before {
  display: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: var(--spacing-xl);
  font-weight: 500;
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-text h1 .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text .subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-avatar {
  width: 320px;
  height: 320px;
  border-radius: var(--radius-2xl);
  border: 4px solid white;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  z-index: 1;
  object-fit: cover;
}

.hero-image::before {
  content: '';
  position: absolute;
  width: 380px;
  height: 380px;
  background: var(--gradient-primary);
  opacity: 0.1;
  border-radius: var(--radius-2xl);
  transform: rotate(6deg);
  z-index: 0;
}

.hero-image::after {
  content: '';
  position: absolute;
  width: 340px;
  height: 340px;
  background: var(--primary-light);
  opacity: 0.15;
  border-radius: var(--radius-2xl);
  transform: rotate(-3deg);
  z-index: 0;
}

/* ========================================
   按钮 - 通义千问风格
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(124, 58, 237, 0.45);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

.btn-secondary {
  background: white;
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  background: var(--primary-soft);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  font-size: 1.1rem;
}

/* ========================================
   卡片 - 玻璃态效果
   ======================================== */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   快速导航
   ======================================== */

.quick-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.quick-nav-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.quick-nav-item:hover {
  border-color: var(--primary);
  background: white;
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.quick-nav-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.quick-nav-text h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.quick-nav-text p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   标签
   ======================================== */

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.tag-primary {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: var(--border);
}

.tag-success {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border-color: rgba(16, 185, 129, 0.2);
}

/* ========================================
   头像
   ======================================== */

.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid white;
  box-shadow: var(--shadow-sm);
}

.avatar-lg {
  width: 120px;
  height: 120px;
  border-width: 4px;
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md), 0 0 0 4px var(--primary-soft);
}

/* ========================================
   时间线
   ======================================== */

.timeline {
  position: relative;
  padding-left: var(--spacing-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary-light), var(--border));
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-2xl) + 4px);
  top: 4px;
  width: 12px;
  height: 12px;
  background: white;
  border: 3px solid var(--primary);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.timeline-date {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.timeline-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.timeline-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

.timeline-content {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ========================================
   技能条
   ======================================== */

.skill-bar {
  margin-bottom: var(--spacing-lg);
}

.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.skill-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.skill-level {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.skill-progress {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 1s ease;
  position: relative;
}

.skill-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 30px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4));
}

/* ========================================
   照片网格
   ======================================== */

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.photo-item {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--radius-xl);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.photo-item:hover img {
  transform: scale(1.05);
}

.photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-lg);
}

.photo-item:hover .photo-overlay {
  opacity: 1;
}

.photo-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: white;
}

/* ========================================
   文章列表
   ======================================== */

.article-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.article-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.article-item:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.article-cover {
  aspect-ratio: 16/10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-content h3:hover {
  color: var(--primary);
}

.article-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.7;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========================================
   聊天界面
   ======================================== */

.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 72px);
  max-width: 900px;
  margin: 0 auto;
}

.chat-header {
  padding: var(--spacing-2xl);
  text-align: center;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border-light);
}

.chat-header h1 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.chat-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  background: var(--bg-primary);
}

.message {
  max-width: 80%;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-xl);
  line-height: 1.7;
  font-size: 0.95rem;
}

.message-user {
  align-self: flex-end;
  background: var(--gradient-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.message-bot {
  align-self: flex-start;
  background: white;
  border: 1px solid var(--border-light);
  border-bottom-left-radius: var(--radius-sm);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.message-bot .thinking {
  display: flex;
  gap: 6px;
  padding: var(--spacing-sm) 0;
}

.message-bot .thinking span {
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: var(--radius-full);
  animation: bounce 1.4s infinite ease-in-out both;
}

.message-bot .thinking span:nth-child(1) { animation-delay: -0.32s; }
.message-bot .thinking span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

.chat-input {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--border-light);
  background: white;
}

.chat-input-form {
  display: flex;
  gap: var(--spacing-md);
}

.chat-input input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.chat-input input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
  background: white;
}

.chat-input input::placeholder {
  color: var(--text-muted);
}

/* ========================================
   表单
   ======================================== */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
  background: white;
}

/* ========================================
   登录页
   ======================================== */

.login-container {
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background: var(--gradient-hero);
}

.login-box {
  width: 100%;
  max-width: 420px;
  padding: var(--spacing-2xl);
  background: white;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.login-box h1 {
  font-size: 1.75rem;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ========================================
   页脚
   ======================================== */

.footer {
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--border-light);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  background: var(--bg-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 768px) {
  .navbar-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-lg);
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-md);
  }

  .navbar-nav.active {
    display: flex;
  }

  .navbar-toggle {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-2xl);
  }

  .hero-text h1 {
    font-size: 2.5rem;
  }

  .hero-image {
    order: -1;
  }

  .hero-avatar {
    width: 260px;
    height: 260px;
  }

  .hero-image::before {
    width: 300px;
    height: 300px;
  }

  .hero-image::after {
    width: 280px;
    height: 280px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .article-item {
    grid-template-columns: 1fr;
  }

  .article-cover {
    aspect-ratio: 16/9;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .section-title {
    font-size: 1.75rem;
  }
}

/* ========================================
   工具类
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.hidden { display: none; }
.flex { display: flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========================================
   动画
   ======================================== */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.shimmer {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, white 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}