/**
 * 移动端滚轮式日期选择器样式
 * 支持亮色/深色双主题模式
 * 符合WCAG对比度标准
 * 使用硬件加速实现60fps流畅滚动
 */

/* ==================== 遮罩层 ==================== */
.mobile-date-picker-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-date-picker-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* ==================== 选择器容器 ==================== */
.mobile-date-picker {
    width: 100%;
    max-width: 500px;
    background: #ffffff;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.15);
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.mobile-date-picker-overlay.visible .mobile-date-picker {
    transform: translateY(0);
}

/* ==================== 头部 ==================== */
.picker-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid #e5e7eb;
    min-height: 44px;
}

.picker-title {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    letter-spacing: 0.3px;
}

.picker-btn {
    background: transparent;
    border: none;
    font-size: 15px;
    font-weight: 500;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s, transform 0.1s;
    min-width: 44px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.picker-cancel {
    color: #6b7280;
}

.picker-cancel:hover {
    background-color: #f3f4f6;
}

.picker-confirm {
    color: #3b82f6;
    font-weight: 600;
}

.picker-confirm:hover {
    background-color: #eff6ff;
}

/* ==================== 滚轮容器 ==================== */
.picker-wheels {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
    gap: 8px;
    position: relative;
    min-height: 260px;
    isolation: isolate; /* 为指示器创建独立的定位上下文 */
}

.picker-wheel-wrapper {
    flex: 1;
    position: relative;
    height: 220px;
    overflow: hidden;
}

.picker-wheel {
    height: 100%;
    position: relative;
    touch-action: pan-y;
    user-select: none;
    -webkit-user-select: none;
    cursor: grab;
}

.picker-wheel:active {
    cursor: grabbing;
}

/* ==================== 滚轮项容器 ==================== */
.picker-wheel-items {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    /* 使用硬件加速 */
    will-change: transform;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

/* ==================== 滚轮项 ==================== */
.picker-wheel-item {
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #6b7280;
    font-weight: 400;
    position: absolute;
    left: 0;
    right: 0;
    pointer-events: none;
    /* 硬件加速 */
    will-change: transform, opacity;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: color 0.2s;
}

.picker-wheel-item.active {
    color: #111827;
    font-weight: 600;
    font-size: 18px;
}

/* ==================== 高亮指示器 ==================== */
.picker-indicator {
    position: absolute;
    left: 20px;
    right: 20px;
    top: calc(50% + 0px); /* 相对于.picker-wheels容器的50%，考虑padding已被包含 */
    transform: translateY(-50%);
    height: 44px;
    border-top: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
    background: transparent; /* 移除背景色，通过文字样式突出选中项 */
    pointer-events: none;
    z-index: 10; /* 提高z-index确保在滚轮项之上 */
    box-sizing: border-box;
}

/* ==================== 深色主题 ==================== */
.dark-mode .mobile-date-picker {
    background: #1f2937;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.4);
}

.dark-mode .picker-header {
    border-bottom-color: #374151;
}

.dark-mode .picker-title {
    color: #f9fafb;
}

.dark-mode .picker-cancel {
    color: #9ca3af;
}

.dark-mode .picker-cancel:hover {
    background-color: #374151;
}

.dark-mode .picker-confirm {
    color: #60a5fa;
}

.dark-mode .picker-confirm:hover {
    background-color: #1e3a5f;
}

.dark-mode .picker-wheel-item {
    color: #9ca3af;
}

.dark-mode .picker-wheel-item.active {
    color: #f9fafb;
}

.dark-mode .picker-indicator {
    border-top-color: #374151;
    border-bottom-color: #374151;
    background: transparent; /* 深色模式也移除背景色 */
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 375px) {
    .picker-wheel-item {
        font-size: 14px;
    }

    .picker-wheel-item.active {
        font-size: 16px;
    }

    .picker-title {
        font-size: 15px;
    }

    .picker-btn {
        font-size: 14px;
    }

    .picker-header {
        padding: 8px 14px;
        min-height: 40px;
    }
}

@media (min-width: 768px) {
    .mobile-date-picker {
        max-width: 480px;
        border-radius: 20px;
        margin-bottom: 20px;
    }
}

/* ==================== 横屏适配 ==================== */
@media (orientation: landscape) and (max-height: 500px) {
    .picker-wheels {
        min-height: 200px;
    }

    .picker-wheel-wrapper {
        height: 180px;
    }

    .picker-header {
        padding: 8px 16px;
        min-height: 40px;
    }
}

/* ==================== 高对比度模式(无障碍) ==================== */
@media (prefers-contrast: high) {
    .picker-header {
        border-bottom-width: 2px;
    }

    .picker-indicator {
        border-top-width: 2px;
        border-bottom-width: 2px;
    }

    .picker-wheel-item.active {
        font-weight: 700;
    }
}

/* ==================== 减少动画模式(无障碍) ==================== */
@media (prefers-reduced-motion: reduce) {
    .mobile-date-picker-overlay,
    .mobile-date-picker,
    .picker-btn,
    .picker-wheel-item {
        transition: none;
        animation: none;
    }
}

/* ==================== 聚焦样式(键盘导航) ==================== */
.picker-btn:focus-visible {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

.dark-mode .picker-btn:focus-visible {
    outline-color: #60a5fa;
}

/* ==================== PWA安全区域 ==================== */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .mobile-date-picker {
        padding-bottom: max(env(safe-area-inset-bottom), 0px);
    }
}

/* ==================== 性能优化 ==================== */
.picker-wheel-items,
.picker-wheel-item {
    /* 强制GPU加速 */
    transform: translate3d(0, 0, 0);
    -webkit-transform: translate3d(0, 0, 0);
}

/* ==================== 触摸优化 ==================== */
.picker-btn,
.picker-wheel {
    -webkit-tap-highlight-color: transparent;
    tap-highlight-color: transparent;
}

/* ==================== 滚动条隐藏 ==================== */
.picker-wheel-wrapper::-webkit-scrollbar {
    display: none;
}

.picker-wheel-wrapper {
    -ms-overflow-style: none;
    scrollbar-width: none;
}