/* ========================================
   家长端 PWA 样式
   清新自然风：浅灰白背景 + 天空蓝/薄荷绿点缀
   ======================================== */

/* CSS 变量 */
:root {
    /* 背景色 */
    --bg-primary: #f8f9fc;
    --bg-secondary: #f0f2f5;
    --bg-card: #ffffff;
    --bg-hover: #f5f7fa;
    
    /* 文字色 */
    --text-primary: #2d3748;
    --text-secondary: #5a6c7d;
    --text-muted: #8a9aae;
    
    /* 新主色：天空蓝 */
    --accent-primary: #4a90d9;
    --accent-secondary: #5ac8a8;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* 功能色 */
    --success: #5ac8a8;
    --warning: #f5a623;
    --danger: #e74c3c;
    --info: #4a90d9;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    
    /* 圆角 */
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 20px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 导航 */
    --nav-height: 60px;
    --status-bar-height: 44px;
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

/* 重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* 状态栏 - 浅色 */
.status-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--status-bar-height);
    background: rgba(248, 249, 252, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    z-index: 1000;
    font-size: 14px;
    font-weight: 600;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    color: var(--text-primary);
}

.status-bar-time {
    color: var(--text-primary);
}

.status-bar-icons {
    display: flex;
    gap: var(--spacing-sm);
    color: var(--text-primary);
}

/* 主内容区 */
.main-content {
    min-height: 100vh;
    padding-top: var(--status-bar-height);
    padding-bottom: calc(var(--nav-height) + var(--safe-area-bottom) + var(--spacing-md));
    background: var(--bg-primary);
}

/* 加载屏 */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: var(--spacing-lg);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(74, 144, 217, 0.2);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-screen p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 底部导航 - 浅色 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--nav-height) + var(--safe-area-bottom));
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(0,0,0,0.06);
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    padding-top: var(--spacing-sm);
    z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    color: var(--text-muted);
    transition: all 0.2s ease;
    padding: var(--spacing-xs) var(--spacing-md);
}

.nav-item.active {
    color: var(--accent-primary);
}

.nav-item:active {
    transform: scale(0.95);
}

.nav-icon {
    font-size: 22px;
    line-height: 1;
}

.nav-label {
    font-size: 11px;
    font-weight: 500;
}

/* 安全区域 */
.safe-area-bottom {
    height: var(--safe-area-bottom);
}

/* 卡片样式 - 白色底 + 柔和阴影 */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #4a90d9 0%, #5ac8a8 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
}

.btn-primary:active {
    transform: scale(0.96);
    opacity: 0.9;
}

/* 渐变文字 - 紫蓝保留用于强调 */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 页面切换动画 */
.page {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 隐藏滚动条 */
::-webkit-scrollbar {
    display: none;
}

/* 响应式：确保在桌面浏览器也好看 */
@media (min-width: 768px) {
    body {
        max-width: 480px;
        margin: 0 auto;
        box-shadow: 0 0 40px rgba(0,0,0,0.1);
    }
    
    .status-bar,
    .bottom-nav {
        max-width: 480px;
        left: 50%;
        transform: translateX(-50%);
    }
}

/* 课程计划类型切换按钮 */
.plan-type-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
    border: 1px solid rgba(0,0,0,0.08);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.plan-type-btn.active {
    background: linear-gradient(135deg, #4a90d9 0%, #5ac8a8 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
}

.plan-type-btn:active {
    transform: scale(0.95);
}

/* 课程计划卡片 */
.plan-card {
    transition: box-shadow 0.2s ease;
}

.plan-card:active {
    box-shadow: var(--shadow-md);
}
.timeline-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.timeline-dot.completed {
    background: var(--success);
}

.timeline-dot.pending {
    background: var(--warning);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.2);
}

.timeline-dot.future {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* 快速入口卡片 */
.quick-entry {
    background: var(--bg-card);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: all 0.2s ease;
}

.quick-entry:active {
    transform: scale(0.96);
    box-shadow: var(--shadow-md);
}

/* 标签/徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: rgba(90, 200, 168, 0.15);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 166, 35, 0.15);
    color: var(--warning);
}

.badge-muted {
    background: var(--bg-secondary);
    color: var(--text-muted);
}