/* ==================== 全局样式 ==================== */
:root {
  /* 主色调 - 深蓝+金色科技感 */
  --primary-dark: #0a1628;
  --primary-blue: #1a3a5c;
  --primary-light: #2d5a87;
  --accent-gold: #d4a843;
  --accent-gold-light: #f0c75e;
  --accent-red: #c41e3a;
  
  /* 辅助色 */
  --text-primary: #ffffff;
  --text-secondary: #b8c5d6;
  --text-dark: #1a1a2e;
  --bg-card: rgba(26, 58, 92, 0.6);
  --bg-card-hover: rgba(45, 90, 135, 0.8);
  --border-color: rgba(212, 168, 67, 0.3);
  
  /* 间距系统 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;
  
  /* 同心圆角系统 (outer = inner + padding) */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  /* 分层阴影系统 (Beautiful Shadows) */
  --shadow-sm: 0px 2px 3px -1px rgba(0,0,0,0.1), 0px 1px 0px 0px rgba(25,28,33,0.02), 0px 0px 0px 1px rgba(25,28,33,0.08);
  --shadow-md: 0px 0px 0px 1px rgba(0,0,0,0.06), 0px 1px 1px -0.5px rgba(0,0,0,0.06), 0px 3px 3px -1.5px rgba(0,0,0,0.06), 0px 6px 6px -3px rgba(0,0,0,0.06), 0px 12px 12px -6px rgba(0,0,0,0.06);
  --shadow-lg: 0 2.8px 2.2px rgba(0,0,0,0.034), 0 6.7px 5.3px rgba(0,0,0,0.048), 0 12.5px 10px rgba(0,0,0,0.06), 0 22.3px 17.9px rgba(0,0,0,0.072), 0 41.8px 33.4px rgba(0,0,0,0.086);
  --shadow-gold: 0 0 20px rgba(212,168,67,0.25), 0 4px 16px rgba(212,168,67,0.15);
  
  /* 动画曲线 */
  --ease-out: cubic-bezier(0.2, 0, 0, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--primary-dark) 0%, #0d1f3c 50%, #12294d 100%);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 var(--spacing-lg);
}

.navbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.navbar-logo {
  font-size: 28px;
}

.navbar-title {
  font-size: 20px;
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.navbar-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  font-size: 15px;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--accent-gold);
  background: rgba(212, 168, 67, 0.1);
}

/* ==================== 主容器 ==================== */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 100px var(--spacing-lg) var(--spacing-xl);
  min-height: 100vh;
}

/* ==================== 页面标题 ==================== */
.page-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.page-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(90deg, #fff, var(--accent-gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
}

/* ==================== 卡片样式 ==================== */
/* 同心圆角原则: outer radius = inner radius + padding */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  /* 指定具体属性，不用 transition: all */
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), background-color 0.25s;
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* 图片轮廓 - 增加深度感 (纯白/纯黑，不用带色彩的 neutral) */
.img-outline {
  outline: 1px solid rgba(255, 255, 255, 0.1);
  outline-offset: -1px;
}

/* 深色模式图片轮廓 */
@media (prefers-color-scheme: dark) {
  .img-outline {
    outline-color: rgba(255, 255, 255, 0.1);
  }
}

/* 图片占位符 */
.img-placeholder {
  background: linear-gradient(135deg, rgba(45, 90, 135, 0.3), rgba(26, 58, 92, 0.5));
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 14px;
  text-align: center;
  padding: var(--spacing-md);
}

.img-placeholder-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
  opacity: 0.5;
}

.img-placeholder-text {
  max-width: 200px;
  line-height: 1.5;
}

.img-placeholder-ratio {
  font-size: 12px;
  color: var(--accent-gold);
  margin-top: var(--spacing-xs);
}

/* ==================== 按钮样式 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), background 0.2s;
  text-decoration: none;
}

/* 按压反馈 - scale(0.96) */
.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-light));
  color: var(--text-dark);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn-primary:active {
  transform: scale(0.96);
}

.btn-secondary {
  background: transparent;
  border: 2px solid var(--accent-gold);
  color: var(--accent-gold);
}

.btn-secondary:hover {
  background: rgba(212, 168, 67, 0.1);
  transform: translateY(-2px);
}

.btn-secondary:active {
  transform: scale(0.96);
}

.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==================== 加载动画 ==================== */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  margin-top: var(--spacing-sm);
  color: var(--text-secondary);
}

/* ==================== 徽章/标签 ==================== */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-gold {
  background: rgba(212, 168, 67, 0.2);
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
}

.badge-blue {
  background: rgba(45, 90, 135, 0.3);
  color: var(--primary-light);
  border: 1px solid var(--primary-light);
}

.badge-red {
  background: rgba(196, 30, 58, 0.2);
  color: #ff6b6b;
  border: 1px solid #ff6b6b;
}

/* ==================== 分隔线 ==================== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: var(--spacing-lg) 0;
}

/* ==================== 页脚 ==================== */
.footer {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-secondary);
  font-size: 14px;
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-xl);
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .navbar-inner {
    flex-direction: column;
    height: auto;
    padding: var(--spacing-sm) 0;
    gap: var(--spacing-sm);
  }
  
  .navbar-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .main-container {
    padding: 140px var(--spacing-sm) var(--spacing-lg);
  }
  
  .page-title {
    font-size: 28px;
  }
  
  .page-subtitle {
    font-size: 15px;
  }
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s var(--ease-out) forwards;
}

/* 交错动画 - 每个元素延迟100ms */
.stagger-1 { animation-delay: 0ms; }
.stagger-2 { animation-delay: 100ms; }
.stagger-3 { animation-delay: 200ms; }
.stagger-4 { animation-delay: 300ms; }
.stagger-5 { animation-delay: 400ms; }
.stagger-6 { animation-delay: 500ms; }

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

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

/* 悬浮动画 */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.float {
  animation: float 3s ease-in-out infinite;
}

/* 缩放进入 */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.scale-in {
  animation: scaleIn 0.4s var(--ease-spring) forwards;
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--primary-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}