/* ===== CSS 变量定义 ===== */
:root {
    /* 柔和配色方案 */
    --primary-color: #ff6b6b;
    --primary-light: #ff8e8e;
    --primary-dark: #e05555;
    --secondary-color: #4ecdc4;
    --accent-color: #ffe66d;
    --success-color: #95e1d3;
    --warning-color: #feca57;
    --danger-color: #ff8787;

    /* 背景色 - 浅色模式 */
    --background: #f8f9fa;
    --background-alt: #f1f3f5;
    --card-background: #ffffff;
    --modal-background: #ffffff;
    --modal-overlay: rgba(0, 0, 0, 0.5);

    /* 文字颜色 - 浅色模式 */
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --text-muted: #b2bec3;

    /* 边框和阴影 */
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== 深色模式 ===== */
[data-theme="dark"] {
    /* 背景色 - 深色模式 */
    --background: #1a1a2e;
    --background-alt: #16213e;
    --card-background: #0f0f1e;
    --modal-background: #0f0f1e;
    --modal-overlay: rgba(0, 0, 0, 0.7);

    /* 文字颜色 - 深色模式 */
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-muted: #606060;

    /* 边框和阴影 */
    --border-color: #2a2a3e;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);

    /* 调整主色调在深色模式下的显示 */
    --primary-color: #ff8787;
    --primary-light: #ffaaaa;
    --primary-dark: #ff6b6b;
}

/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, var(--background-alt) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== 顶部导航栏 ===== */
.navbar {
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.brand-icon {
    font-size: 1.8rem;
}

.navbar-brand h1 {
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-date {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-md);
}

/* ===== 主内容容器 ===== */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* ===== 通用卡片样式 ===== */
.card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

.card-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.refresh-icon {
    font-size: 1.2rem;
}

/* ===== 左列 - 番茄钟核心区域 ===== */
.column-left {
    display: flex;
    flex-direction: column;
}

.timer-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mode-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.mode-badge.break {
    background: linear-gradient(135deg, var(--secondary-color), #6dd5ce);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.3);
}

/* 圆形进度环 */
.timer-ring {
    position: relative;
    width: 300px;
    height: 300px;
    margin-bottom: var(--spacing-xl);
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring__bg {
    stroke: var(--border-color);
    stroke-width: 12;
    fill: transparent;
}

.progress-ring__progress {
    stroke: var(--primary-color);
    stroke-width: 12;
    fill: transparent;
    stroke-linecap: round;
    stroke-dasharray: 879.65; /* 2 * π * 140 */
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.5s ease, stroke var(--transition-normal);
}

.progress-ring__progress.break {
    stroke: var(--secondary-color);
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.timer-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.time-value {
    font-size: 3.5rem;
    font-weight: 300;
    color: var(--text-primary);
    letter-spacing: 2px;
    line-height: 1;
}

.colon {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

/* 控制按钮 */
.timer-controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    width: 100%;
    margin-bottom: var(--spacing-xl);
}

.control-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition-normal);
    background: var(--background);
    color: var(--text-secondary);
    user-select: none;
    -webkit-user-select: none;
}

.control-btn * {
    pointer-events: none;
}

.control-btn:hover {
    background: var(--background-alt);
    transform: translateY(-2px);
}

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

.btn-icon {
    font-size: 1.2rem;
}

.btn-start {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.btn-start:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    box-shadow: 0 6px 16px rgba(255, 107, 107, 0.4);
}

.btn-pause:hover {
    background: linear-gradient(135deg, var(--warning-color), #ffd93d);
    color: var(--text-primary);
}

.btn-skip:hover {
    background: linear-gradient(135deg, var(--text-muted), #cfd8dc);
    color: var(--text-primary);
}

/* 模式选择器 */
.mode-selector {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.mode-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--background);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition-normal);
    user-select: none;
    -webkit-user-select: none;
}

.mode-option * {
    pointer-events: none;
}

.mode-option:hover {
    background: var(--background-alt);
}

.mode-option.active {
    border-color: var(--primary-color);
    background: rgba(255, 107, 107, 0.05);
}

.mode-option.break.active {
    border-color: var(--secondary-color);
    background: rgba(78, 205, 196, 0.05);
}

.mode-icon {
    font-size: 1.2rem;
}

.mode-time {
    margin-left: auto;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== 中列 - 任务管理区域 ===== */
.column-middle {
    display: flex;
    flex-direction: column;
}

.task-count {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    font-weight: 600;
}

/* 任务输入 */
.task-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.task-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: var(--transition-normal);
    background: var(--background);
}

.task-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--card-background);
}

.task-input::placeholder {
    color: var(--text-muted);
}

.task-estimate-input {
    width: 70px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    text-align: center;
    transition: var(--transition-normal);
    background: var(--background);
}

.task-estimate-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--card-background);
}

.task-estimate-input::-webkit-inner-spin-button,
.task-estimate-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.task-estimate-input {
    -moz-appearance: textfield;
}

/* 任务提示 */
.task-tip {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-lg);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tip-icon {
    font-size: 1rem;
}

.btn-add {
    width: 48px;
    height: 48px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
}

.btn-add * {
    pointer-events: none;
}

.btn-add:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

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

/* 任务列表 */
.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

.task-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
}

.task-item:hover {
    background: var(--background-alt);
    border-color: var(--border-color);
}

/* 当前任务特殊样式 */
.task-item.active {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.08), rgba(255, 107, 107, 0.03));
    border-color: var(--primary-color);
    box-shadow: 0 2px 12px rgba(255, 107, 107, 0.15);
}

.task-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background: var(--primary-color);
    border-radius: 0 4px 4px 0;
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* 任务激活标记 */
.task-active-badge {
    display: none;
    position: absolute;
    right: var(--spacing-md);
    top: 4px;
    font-size: 0.65rem;
    color: var(--primary-color);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.task-item.active .task-active-badge {
    display: block;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 2px;
}

.task-content {
    flex: 1;
    min-width: 0;
}

.task-text {
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-word;
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
}

/* 番茄计数器 */
.task-pomodoro-counter {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.pomodoro-icon {
    font-size: 0.85rem;
}

.pomodoro-count {
    font-weight: 500;
    color: var(--text-secondary);
}

.pomodoro-count.completed {
    color: var(--success-color);
}

.pomodoro-count.in-progress {
    color: var(--warning-color);
}

.pomodoro-count.over {
    color: var(--danger-color);
}

.task-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: flex-start;
}

.task-delete {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 1.1rem;
    transition: var(--transition-normal);
    opacity: 0;
    flex-shrink: 0;
}

.task-item:hover .task-delete {
    opacity: 1;
}

.task-delete:hover {
    color: var(--danger-color);
    background: rgba(255, 135, 135, 0.1);
    border-radius: var(--radius-sm);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--text-muted);
}

.empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

.empty-state p {
    font-size: 1rem;
}

/* ===== 右列 - 数据统计区域 ===== */
.column-right {
    display: flex;
    flex-direction: column;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    background: var(--background);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-normal);
}

.stat-item:hover {
    background: var(--background-alt);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 1.8rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== 统计卡片额外样式 ===== */
.stats-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--background);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* 周统计图表 */
.chart-section {
    margin-top: var(--spacing-lg);
}

.chart-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.chart-container {
    position: relative;
    height: 200px;
    width: 100%;
}

/* 本月统计摘要 */
.month-summary {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.month-summary h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.month-stats {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.month-stat {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.month-stat:hover {
    background: var(--background-alt);
    transform: translateY(-2px);
}

.month-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.month-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* 数字动画效果 */
.stat-value, .month-value {
    transition: color var(--transition-normal);
}

.stat-value.updated, .month-value.updated {
    animation: pulse 0.5s ease;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* ===== 数据可视化区域 ===== */
.charts-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

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

.charts-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.time-range-selector {
    display: flex;
    gap: var(--spacing-xs);
}

.range-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    background: var(--background);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.range-btn:hover {
    background: var(--background-alt);
    color: var(--text-primary);
}

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

/* 图表标签页 */
.charts-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    scrollbar-width: none;
}

.charts-tabs::-webkit-scrollbar {
    display: none;
}

.chart-tab {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: var(--background);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap;
}

.chart-tab:hover {
    background: var(--background-alt);
    color: var(--text-primary);
}

.chart-tab.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

/* 图表内容 */
.chart-content {
    display: none;
    position: relative;
    height: 220px;
    width: 100%;
}

.chart-content.active {
    display: block;
}

.chart-content canvas {
    width: 100% !important;
    height: 100% !important;
}

/* Chart.js 自定义样式 */
.chartjs-tooltip {
    background: rgba(0, 0, 0, 0.85) !important;
    backdrop-filter: blur(4px);
    border-radius: 8px !important;
    padding: 12px !important;
    border: none !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2) !important;
}

.chartjs-tooltip-title {
    font-family: 'Inter', sans-serif !important;
    font-size: 12px !important;
    color: #fff !important;
    margin-bottom: 8px !important;
    font-weight: 500 !important;
}

.chartjs-tooltip-body {
    font-family: 'Inter', sans-serif !important;
    font-size: 13px !important;
    color: rgba(255, 255, 255, 0.9) !important;
}

/* 任务分布图特殊样式 */
#chart-tasks {
    height: 240px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#taskDistributionChart {
    max-width: 180px;
    margin: 0 auto;
}

/* 图表图例 */
.chart-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    max-width: 280px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--background);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.legend-label {
    color: var(--text-secondary);
}

.legend-value {
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== 滚动条样式 ===== */
.task-list::-webkit-scrollbar {
    width: 6px;
}

.task-list::-webkit-scrollbar-track {
    background: var(--background);
    border-radius: 3px;
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 1fr 1fr;
    }

    .column-right {
        grid-column: 1 / -1;
    }

    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .main-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .navbar-container {
        padding: 0 var(--spacing-md);
    }

    .navbar-brand h1 {
        font-size: 1.2rem;
    }

    .navbar-date {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .card {
        padding: var(--spacing-lg);
    }

    .timer-ring {
        width: 250px;
        height: 250px;
    }

    .progress-ring {
        width: 250px;
        height: 250px;
    }

    .progress-ring circle {
        r: 115;
    }

    .progress-ring__progress {
        stroke-dasharray: 722.5; /* 2 * π * 115 */
    }

    .time-value {
        font-size: 2.8rem;
    }

    .timer-controls {
        grid-template-columns: 1fr;
    }

    .control-btn {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .mode-selector {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .mode-option {
        flex: 1;
        min-width: 100px;
        flex-direction: column;
        text-align: center;
    }

    .mode-time {
        margin-left: 0;
    }

    .task-list {
        max-height: 300px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-item {
        padding: var(--spacing-md);
    }

    .stat-value {
        font-size: 1.2rem;
    }

    /* 图表响应式 */
    .chart-content {
        height: 200px;
    }

    .chart-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .chart-tab {
        min-width: 90px;
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 12px;
    }

    .main-container {
        padding: var(--spacing-md);
    }

    .timer-ring {
        width: 200px;
        height: 200px;
    }

    .progress-ring {
        width: 200px;
        height: 200px;
    }

    .progress-ring circle {
        r: 90;
    }

    .progress-ring__progress {
        stroke-dasharray: 565.48; /* 2 * π * 90 */
    }

    .time-value {
        font-size: 2.2rem;
    }

    .mode-selector {
        flex-direction: column;
    }

    .mode-option {
        min-width: auto;
        flex-direction: row;
        text-align: left;
    }

    .mode-time {
        margin-left: auto;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    /* 图表移动端样式 */
    .charts-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .time-range-selector {
        width: 100%;
    }

    .range-btn {
        flex: 1;
    }

    .chart-content {
        height: 180px;
    }

    .chart-legend {
        max-width: 100%;
    }

    .legend-item {
        flex: 1;
        min-width: 80px;
    }
}

/* ===== 动画效果 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-item {
    animation: fadeIn 0.3s ease;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

.timer-card.running .timer-ring {
    animation: pulse 2s ease-in-out infinite;
}

/* ===== 运行状态样式 ===== */
.timer-card.running .mode-badge {
    animation: pulse 1s ease-in-out infinite;
}

/* ===== 导航栏优化 ===== */
.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--background);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition-normal);
}

.nav-btn:hover {
    background: var(--background-alt);
    transform: translateY(-2px);
}

.nav-btn span {
    filter: grayscale(0.2);
    transition: var(--transition-normal);
}

.nav-btn:hover span {
    filter: grayscale(0);
}

/* ===== 设置模态框 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--modal-background);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9) translateY(20px);
    transition: all var(--transition-normal);
}

.modal-overlay.active .modal-container {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--background);
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.modal-close:hover {
    background: var(--background-alt);
    color: var(--text-primary);
    transform: rotate(90deg);
}

.modal-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(85vh - 140px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* 设置分组 */
.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.setting-item {
    margin-bottom: var(--spacing-md);
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.setting-value {
    font-weight: 500;
    color: var(--primary-color);
}

/* 滑块样式 */
.setting-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--background-alt);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.4);
    transition: var(--transition-normal);
}

.setting-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.5);
}

.setting-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.4);
    transition: var(--transition-normal);
}

/* 开关样式 */
.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background-alt);
    transition: var(--transition-normal);
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: var(--transition-normal);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary-color);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

/* 导出按钮 */
.export-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn-export {
    flex: 1;
    min-width: 120px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: var(--background);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-export:hover {
    background: var(--background-alt);
    border-color: var(--primary-color);
}

/* 危险按钮 */
.setting-danger {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.btn-danger {
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    background: rgba(255, 135, 135, 0.1);
    color: var(--danger-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-danger:hover {
    background: rgba(255, 135, 135, 0.2);
}

/* 模态框按钮 */
.modal-footer .btn-primary,
.modal-footer .btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

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

.modal-footer .btn-secondary {
    background: var(--background);
    color: var(--text-secondary);
}

.modal-footer .btn-secondary:hover {
    background: var(--background-alt);
    color: var(--text-primary);
}

/* ===== 键盘快捷键提示 ===== */
.keyboard-hint {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-background);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    z-index: 100;
}

.keyboard-hint.visible {
    opacity: 1;
}

.hint-key {
    background: var(--background-alt);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

/* ===== Toast 通知 ===== */
.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    background: var(--card-background);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 1001;
    opacity: 0;
    transform: translateX(100px);
    transition: all var(--transition-normal);
}

.toast.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ===== Toast 移动端 ===== */
@media (max-width: 768px) {
    .toast {
        top: auto;
        bottom: 100px;
        right: 50%;
        transform: translateX(50%) translateY(100px);
    }

    .toast.visible {
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== 动画优化 ===== */
/* 任务添加/删除过渡 */
.task-item {
    animation: slideIn 0.3s ease;
}

.task-item.removing {
    animation: slideOut 0.3s ease forwards;
}

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

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(20px);
        height: 0;
        margin: 0;
        padding: 0;
    }
}

/* 模式切换淡入淡出 */
.timer-label,
.mode-badge {
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.mode-switching .timer-label,
.mode-switching .mode-badge {
    opacity: 0;
    transform: scale(0.9);
}

/* 进度环平滑动画 */
.progress-ring__progress {
    transition: stroke-dashoffset 0.3s ease;
}

/* ===== 响应式 - 设置模态框 ===== */
@media (max-width: 768px) {
    .modal-container {
        width: 95%;
        max-height: 90vh;
    }

    .modal-content {
        max-height: calc(90vh - 130px);
    }

    .keyboard-hint {
        bottom: var(--spacing-md);
    }
}

/* ===== 主题切换过渡 ===== */
body,
.card,
.navbar,
.timer-display,
.stat-item,
.task-item {
    transition: background-color var(--transition-slow),
                color var(--transition-slow),
                border-color var(--transition-slow);
}

.timer-card.paused .progress-ring__progress {
    opacity: 0.5;
}

/* ===== 暗色模式支持（可选） ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #1a1a2e;
        --background-alt: #16213e;
        --card-background: #0f0f1e;
        --text-primary: #e0e0e0;
        --text-secondary: #a0a0a0;
        --text-muted: #606060;
        --border-color: #2a2a3e;
    }

    .task-input {
        color: var(--text-primary);
    }

    .stat-icon {
        background: var(--background-alt);
    }
}