/* CSS变量定义 */
:root {
  /* 颜色系统 - 浅色主题 */
  --primary-color: #007AFF;
  --primary-hover: #0051D5;
  --bg-color: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --text-primary: #1D1D1F;
  --text-secondary: #86868B;
  --border-color: #E5E5EA;
  --card-bg: #FFFFFF;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* 状态颜色 */
  --color-urgent: #FF3B30;
  --color-warning: #FF9500;
  --color-caution: #FFCC02;
  --color-normal: #34C759;
  --color-future: #5AC8FA;
  
  /* 字体系统 */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  
  /* 尺寸系统 */
  --container-max-width: 1200px;
  --border-radius: 12px;
  --border-radius-large: 20px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* 动画 */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色主题 */
[data-theme="dark"] {
  --bg-color: #000000;
  --bg-secondary: #1C1C1E;
  --text-primary: #FFFFFF;
  --text-secondary: #8E8E93;
  --border-color: #38383A;
  --card-bg: #1C1C1E;
  --shadow: rgba(255, 255, 255, 0.05);
  --shadow-hover: rgba(255, 255, 255, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
  overflow-x: hidden;
  
  /* Mountain background image */
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.2)),
    url('../assets/mountain-background.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
}

/* Dark theme background overlay */
[data-theme="dark"] body {
  background-image: 
    linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.4)),
    url('../assets/mountain-background.jpg');
}

/* 容器 */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* 头部导航 */
.header {
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid rgba(229, 229, 234, 0.6);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .header {
  background: rgba(28, 28, 30, 0.85);
  border-bottom: 1px solid rgba(56, 56, 58, 0.6);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  font-size: 32px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  margin: 0;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

/* 语言切换按钮 */
.lang-switch {
  margin-left: auto;
}

.lang-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-height: 36px;
}

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

.lang-icon {
  font-size: 16px;
}

.lang-text {
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
}

/* 主内容区 */
.main {
  min-height: calc(100vh - 180px);
  padding: var(--spacing-xl) 0;
}

/* 欢迎区域 */
.hero-section {
  text-align: center;
  margin-bottom: var(--spacing-xxl);
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--primary-color), var(--color-future));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Enhanced readability over background */
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
  position: relative;
}

.hero-title::before {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.95);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  z-index: -1;
  filter: blur(1px);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 500;
  text-shadow: 
    0 1px 3px rgba(255, 255, 255, 0.8),
    0 2px 6px rgba(0, 0, 0, 0.3);
  background: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  display: inline-block;
  margin: 0 auto;
}

/* 创建区域 */
.create-section {
  margin-bottom: var(--spacing-xxl);
}

.create-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-xl);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(229, 229, 234, 0.6);
  transition: var(--transition);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .create-card {
  background: rgba(28, 28, 30, 0.9);
  border: 1px solid rgba(56, 56, 58, 0.6);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.create-card:hover {
  box-shadow: 0 8px 40px var(--shadow-hover);
  transform: translateY(-2px);
}

.create-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.create-icon {
  font-size: 24px;
}

.create-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
}

.create-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input {
  padding: var(--spacing-md);
  border: 2px solid rgba(229, 229, 234, 0.8);
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-primary);
  font-size: 16px;
  transition: var(--transition);
  font-family: var(--font-family);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-theme="dark"] .form-input {
  background: rgba(28, 28, 30, 0.9);
  border: 2px solid rgba(56, 56, 58, 0.8);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-input:invalid {
  border-color: var(--color-urgent);
}

.create-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-height: 48px;
}

.create-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

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

.btn-icon {
  font-size: 18px;
  font-weight: 300;
}

/* 倒计时区域 */
.countdown-section {
  margin-bottom: var(--spacing-xxl);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0;
}

.view-controls {
  display: flex;
  gap: var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-xs);
}

.view-btn {
  background: transparent;
  border: none;
  padding: var(--spacing-sm);
  border-radius: calc(var(--border-radius) - var(--spacing-xs));
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
}

.view-btn.active,
.view-btn:hover {
  background: var(--primary-color);
  color: white;
}

.view-icon {
  font-size: 16px;
}

/* 倒计时网格 */
.countdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.countdown-grid.list-view {
  grid-template-columns: 1fr;
}

/* 倒计时卡片 */
.countdown-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-xl);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(229, 229, 234, 0.6);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .countdown-card {
  background: rgba(28, 28, 30, 0.9);
  border: 1px solid rgba(56, 56, 58, 0.6);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.countdown-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.countdown-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--card-status-color, var(--primary-color));
}

.countdown-card.status-urgent {
  --card-status-color: var(--color-urgent);
}

.countdown-card.status-warning {
  --card-status-color: var(--color-warning);
}

.countdown-card.status-caution {
  --card-status-color: var(--color-caution);
}

.countdown-card.status-normal {
  --card-status-color: var(--color-normal);
}

.countdown-card.status-future {
  --card-status-color: var(--color-future);
}

.countdown-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-lg);
}

.countdown-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
  line-height: 1.4;
}

.countdown-actions {
  display: flex;
  gap: var(--spacing-sm);
  opacity: 0;
  transition: var(--transition);
}

.countdown-card:hover .countdown-actions {
  opacity: 1;
}

.action-btn {
  background: var(--bg-secondary);
  border: none;
  border-radius: var(--border-radius);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
}

.action-btn:hover {
  background: var(--primary-color);
  color: white;
  transform: scale(1.1);
}

.action-btn--delete:hover {
  background: var(--color-urgent);
}

.countdown-time {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

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

.time-unit {
  text-align: center;
  min-width: 60px;
}

.time-number {
  display: block;
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--card-status-color, var(--primary-color));
  line-height: 1;
  transition: transform 0.1s ease-out;
}

.seconds-counter {
  transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.time-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
  font-weight: 500;
}

.countdown-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(var(--card-status-color, var(--primary-color)), 0.1);
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 500;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--card-status-color, var(--primary-color));
  animation: pulse-status 2s infinite;
}

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

.countdown-expired {
  color: var(--color-urgent);
  text-align: center;
  font-weight: 600;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: var(--spacing-xxl);
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius-large);
  backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  margin: var(--spacing-lg);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-lg);
  opacity: 0.7;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.empty-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.empty-text {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 浮动按钮 */
.fab {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 56px;
  height: 56px;
  background: var(--primary-color);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 122, 255, 0.3);
  transition: var(--transition);
  z-index: 1000;
}

.fab:hover {
  background: var(--primary-hover);
  transform: scale(1.1);
  box-shadow: 0 6px 30px rgba(0, 122, 255, 0.4);
}

.fab-icon {
  font-weight: 300;
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  bottom: calc(var(--spacing-xl) + 72px);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  transition: var(--transition);
  z-index: 1000;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  transform: scale(1.1);
}

/* 模态框 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--border-radius-large);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  z-index: 1;
  animation: modalSlideIn 0.3s ease;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(229, 229, 234, 0.6);
}

[data-theme="dark"] .modal-content {
  background: rgba(28, 28, 30, 0.95);
  border: 1px solid rgba(56, 56, 58, 0.6);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

/* Dark theme overrides for enhanced readability */
[data-theme="dark"] .hero-subtitle {
  background: rgba(28, 28, 30, 0.9);
  text-shadow: 
    0 1px 3px rgba(0, 0, 0, 0.8),
    0 2px 6px rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .empty-state {
  background: rgba(28, 28, 30, 0.9);
  border: 1px solid rgba(56, 56, 58, 0.6);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.modal-content--small {
  max-width: 400px;
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xl) var(--spacing-xl) 0;
}

.modal-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-secondary);
}

.modal-form {
  padding: var(--spacing-lg) var(--spacing-xl);
}

.modal-body {
  padding: var(--spacing-lg) var(--spacing-xl);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  padding: 0 var(--spacing-xl) var(--spacing-xl);
  justify-content: flex-end;
}

/* 按钮样式 */
.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

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

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

.btn--secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn--secondary:hover {
  background: var(--border-color);
}

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

.btn--danger:hover {
  background: #E6342A;
}

/* 法律页面 */
.legal-pages {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9998;
  pointer-events: none;
}

.legal-page {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-color);
  padding: var(--spacing-xl) 0;
  overflow-y: auto;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-slow);
  pointer-events: none;
}

.legal-page:target {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.legal-page h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.legal-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: var(--spacing-xl) 0 var(--spacing-lg);
  color: var(--primary-color);
}

.legal-content p {
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.legal-content ul {
  margin: var(--spacing-lg) 0;
  padding-left: var(--spacing-xl);
}

.legal-content li {
  margin-bottom: var(--spacing-sm);
}

.legal-close {
  display: block;
  margin: var(--spacing-xl) auto 0;
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.legal-close:hover {
  background: var(--primary-hover);
}

/* 底部 */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: auto;
}

.copyright {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .countdown-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  /* Mobile background optimization */
  body {
    background-attachment: scroll; /* Better performance on mobile */
    background-position: center top;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .nav-section {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-links {
    justify-content: center;
  }
  
  .lang-switch {
    margin-left: 0;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .countdown-grid {
    grid-template-columns: 1fr;
  }
  
  .section-header {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .time-display {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .time-unit {
    min-width: 50px;
    flex: 1;
  }
  
  .time-number {
    font-size: 24px;
  }
  
  .fab {
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    font-size: 20px;
  }
  
  .theme-toggle {
    bottom: calc(var(--spacing-lg) + 60px);
    right: var(--spacing-lg);
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  
  .modal {
    padding: var(--spacing-md);
  }
  
  .modal-actions {
    flex-direction: column;
  }
  
  .create-card {
    padding: var(--spacing-lg);
  }
  
  .countdown-card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }
  
  .section-title {
    font-size: 20px;
  }
  
  .countdown-title {
    font-size: 16px;
  }
  
  .time-number {
    font-size: 20px;
  }
  
  .time-label {
    font-size: 10px;
  }
}

/* 打印样式 */
@media print {
  .fab,
  .theme-toggle,
  .modal,
  .legal-pages,
  .countdown-actions,
  .nav-links {
    display: none !important;
  }
  
  .header {
    position: static;
  }
  
  .countdown-card {
    break-inside: avoid;
    box-shadow: none;
    border: 2px solid var(--border-color);
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* 焦点可访问性 */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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

.fade-in {
  animation: fadeIn 0.5s ease-out;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
  }
  
  .countdown-card {
    border-width: 2px;
  }
  
  .form-input {
    border-width: 2px;
  }
}