/* ===== 基础重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --accent: #f472b6;
  --accent-light: #f9a8d4;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-muted: #f1f5f9;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 720px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: linear-gradient(135deg, #faf5ff 0%, #f0f9ff 50%, #f0fdf4 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* 装饰背景元素 */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 80%, rgba(99,102,241,0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(244,114,182,0.08) 0%, transparent 50%),
              radial-gradient(circle at 40% 40%, rgba(34,211,238,0.05) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}

/* ===== 布局容器 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.5);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--primary);
  background: rgba(99,102,241,0.08);
}

.nav-links a.active {
  color: var(--primary);
  background: rgba(99,102,241,0.1);
}

/* ===== Hero 区块 ===== */
.hero {
  text-align: center;
  padding: 100px 24px 80px;
  position: relative;
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 28px;
  border: 4px solid #fff;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transition: var(--transition);
}

.avatar:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(99,102,241,0.25);
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  color: var(--text-secondary);
  font-size: 1.15rem;
  margin-bottom: 36px;
  font-weight: 400;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
  border: 2px solid var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99,102,241,0.05);
  transform: translateY(-2px);
}

.btn-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 卡片列表 ===== */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 40px 0;
}

.card {
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.8);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.2));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(99,102,241,0.2);
}

.card h3 {
  margin-bottom: 8px;
  font-weight: 700;
  font-size: 1.1rem;
}

.card h3 a {
  color: var(--text);
  text-decoration: none;
  transition: var(--transition);
}

.card h3 a:hover {
  color: var(--primary);
}

.card .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
}

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

/* ===== 视频卡片 ===== */
.video-card {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.video-card .thumbnail {
  width: 180px;
  height: 102px;
  object-fit: cover;
  border-radius: var(--radius);
  flex-shrink: 0;
  transition: var(--transition);
}

.video-card:hover .thumbnail {
  transform: scale(1.03);
}

.video-card .content {
  flex: 1;
}

.video-card .platform-links {
  display: flex;
  gap: 16px;
  margin-top: 14px;
}

.video-card .platform-links a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

.video-card .platform-links a:hover {
  color: var(--primary-dark);
}

/* ===== 页面标题 ===== */
.page-header {
  padding: 80px 24px 50px;
  text-align: center;
  position: relative;
}

.page-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ===== 分区标题 ===== */
.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 48px 0 24px;
  padding-bottom: 12px;
  color: var(--text);
  border-bottom: 2px solid var(--border);
  letter-spacing: -0.01em;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 40px;
}

.footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .hero {
    padding: 70px 20px 60px;
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .avatar {
    width: 110px;
    height: 110px;
  }
  
  .video-card {
    flex-direction: column;
  }
  
  .video-card .thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 16/9;
  }
  
  .nav-links {
    gap: 4px;
  }
  
  .nav-links a {
    padding: 6px 10px;
    font-size: 0.85rem;
  }
  
  .page-header {
    padding: 60px 20px 40px;
  }
  
  .page-header h1 {
    font-size: 1.75rem;
  }
  
  .card {
    padding: 22px;
  }
  
  .btn {
    padding: 12px 22px;
    font-size: 0.9rem;
  }
}

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

.hero, .card-list, .page-header {
  animation: fadeIn 0.6s ease-out;
}