/* 全局样式 */
:root {
    --primary: #1B8CD1;
    --secondary: #2AABEE;
    --background: #f8f9fa;
    --dark-bg: #121212;
    --dark-card: #1e1e1e;
    --error-bg: #fee2e2;
    --transition-speed: 300ms;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 表单浮动标签效果 */
.form-floating {
    position: relative;
}

/* 输入框聚焦时的流光效果 */
input:focus {
    box-shadow: 0 0 0 2px rgba(27, 140, 209, 0.2);
    animation: glow 1.5s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        box-shadow: 0 0 5px rgba(42, 171, 238, 0.2);
    }
    to {
        box-shadow: 0 0 10px rgba(27, 140, 209, 0.4);
    }
}

/* 骨架屏加载动画 */
.skeleton-loader {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

.dark .skeleton-loader {
    background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
    background-size: 200% 100%;
}

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

/* 错误提示动画 */
#error-notification.show {
    transform: translateY(0);
}

/* 行程卡片悬停效果 */
.itinerary-card {
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.itinerary-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.dark .itinerary-card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* 时间轴样式 */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--secondary), var(--primary));
}

.timeline-item {
    position: relative;
    padding-bottom: 1.5rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -2.25rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    transform: translateX(50%);
}

/* 复制按钮效果 */
.copy-btn {
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.itinerary-card:hover .copy-btn {
    opacity: 1;
}

.copy-btn.copied {
    background-color: #10B981;
}

/* 渐现动画 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 640px) {
    .timeline {
        padding-left: 1.5rem;
    }
    
    .timeline-dot {
        left: -1.75rem;
    }
}

/* 暗黑模式切换动画 */
.dark-mode-transition {
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease;
}