/**
 * LocalCN Trip - 图标系统 CSS
 * 统一全站图标风格、尺寸、颜色规范
 * Version: 1.0.0
 * Author: frontend-expert
 */

/* ===== 图标尺寸令牌 ===== */
:root {
  --icon-xs: 12px;
  --icon-sm: 16px;
  --icon-md: 20px;
  --icon-lg: 24px;
  --icon-xl: 32px;
  --icon-2xl: 48px;
}

/* ===== 基础图标容器 ===== */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 0;
}

.icon svg {
  width: var(--icon-md);
  height: var(--icon-md);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== 图标尺寸变体 ===== */
.icon--xs svg { width: var(--icon-xs); height: var(--icon-xs); }
.icon--sm svg { width: var(--icon-sm); height: var(--icon-sm); }
.icon--md svg { width: var(--icon-md); height: var(--icon-md); }
.icon--lg svg { width: var(--icon-lg); height: var(--icon-lg); }
.icon--xl svg { width: var(--icon-xl); height: var(--icon-xl); }
.icon--2xl svg { width: var(--icon-2xl); height: var(--icon-2xl); }

/* ===== 图标颜色变体 ===== */
.icon--primary { color: var(--color-brand-primary); }
.icon--secondary { color: var(--color-brand-secondary); }
.icon--accent { color: var(--color-brand-accent); }
.icon--muted { color: var(--text-tertiary); }
.icon--white { color: #ffffff; }
.icon--success { color: var(--color-success); }
.icon--warning { color: var(--color-warning); }
.icon--danger { color: var(--color-danger); }

/* ===== 图标圆形背景容器 ===== */
.icon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.icon-badge svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-badge--sm {
  width: 32px;
  height: 32px;
}

.icon-badge--sm svg {
  width: var(--icon-sm);
  height: var(--icon-sm);
}

.icon-badge--md {
  width: 44px;
  height: 44px;
}

.icon-badge--md svg {
  width: var(--icon-md);
  height: var(--icon-md);
}

.icon-badge--lg {
  width: 56px;
  height: 56px;
}

.icon-badge--lg svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
}

.icon-badge--xl {
  width: 72px;
  height: 72px;
}

.icon-badge--xl svg {
  width: var(--icon-xl);
  height: var(--icon-xl);
}

/* ===== 图标徽章颜色 ===== */
.icon-badge--primary {
  background: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
}

.icon-badge--secondary {
  background: rgba(255, 143, 0, 0.15);
  color: var(--color-brand-secondary);
}

.icon-badge--tech {
  background: rgba(30, 136, 229, 0.15);
  color: var(--color-brand-accent);
}

.icon-badge--glass {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ===== 图标动效 ===== */
.icon--spin {
  animation: icon-spin 1s linear infinite;
}

@keyframes icon-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

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

.icon--bounce {
  animation: icon-bounce 1s ease infinite;
}

@keyframes icon-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ===== 内联文本图标对齐 ===== */
.icon-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  vertical-align: middle;
}

/* ===== 导航图标（特定样式）===== */
.nav-icon {
  width: var(--icon-sm);
  height: var(--icon-sm);
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-icon:hover {
  transform: scale(1.1);
}

/* ===== 分类图标（旅游相关）===== */
/* 食物类 */
.icon-food::before { content: "🍜"; }

/* 景点类 */
.icon-attraction::before { content: "🏛️"; }

/* 酒店类 */
.icon-hotel::before { content: "🏨"; }

/* 交通类 */
.icon-transport::before { content: "🚄"; }

/* 钱币/价格类 */
.icon-price::before { content: "💴"; }

/* 时钟/时间类 */
.icon-time::before { content: "⏱️"; }

/* ===== 响应式图标 ===== */
@media (max-width: 640px) {
  :root {
    --icon-xs: 10px;
    --icon-sm: 14px;
    --icon-md: 18px;
    --icon-lg: 22px;
    --icon-xl: 28px;
    --icon-2xl: 40px;
  }
}

/* ===== 减少动画（无障碍）===== */
@media (prefers-reduced-motion: reduce) {
  .icon--spin,
  .icon--pulse,
  .icon--bounce {
    animation: none;
  }
}

/* ===== 图标列表（用于功能列表）===== */
.icon-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.icon-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.icon-list__icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.icon-list__content {
  flex: 1;
}

.icon-list__title {
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.icon-list__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}