/* 主题变量 */
:root {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-primary: #818cf8;
    --accent-secondary: #a78bfa;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
    padding-top: 80px; /* 防止导航栏遮挡内容 */
}

.main-content {
    padding: 20px;
    padding-bottom: 80px;
    min-height: calc(100vh - 200px);
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

/* 页面标题 */
.page-header {
    text-align: center;
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.page-header h1 i {
    color: var(--accent-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 主题切换按钮 */
.btn-icon {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

/* 模式切换 */
.mode-switcher {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.mode-btn {
    padding: 12px 24px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px var(--shadow-color);
}

/* 计时显示区域 */
.timer-display {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 50px 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px var(--shadow-color);
    text-align: center;
}

.time-digits {
    font-family: 'SF Mono', 'Courier New', monospace;
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    line-height: 1;
}

.digit-group {
    display: flex;
    align-items: baseline;
}

.digit {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    min-width: 2ch;
    text-align: center;
}

.milli .digit {
    font-size: 0.6em;
    opacity: 0.8;
}

.separator {
    color: var(--text-secondary);
    opacity: 0.5;
    animation: blink 1s ease-in-out infinite;
}

.millisep {
    font-size: 0.8em;
}

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

/* 倒计时设置 */
.countdown-settings {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.countdown-inputs {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.input-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.input-block label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.input-block input {
    width: 80px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    font-family: 'SF Mono', monospace;
    transition: border-color 0.3s ease;
}

.input-block input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* 控制按钮 */
.control-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.125rem;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-color);
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
}

.btn-danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-danger:hover {
    background: var(--danger-color);
    color: white;
}

/* 声音开关 */
.sound-toggle {
    text-align: center;
    margin-bottom: 30px;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-switch {
    width: 50px;
    height: 26px;
    background: var(--border-color);
    border-radius: 13px;
    position: relative;
    transition: background 0.3s ease;
}

.toggle-switch::after {
    content: '';
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.toggle-label input[type="checkbox"]:checked + .toggle-switch {
    background: var(--success-color);
}

.toggle-label input[type="checkbox"]:checked + .toggle-switch::after {
    transform: translateX(24px);
}

/* 计次记录 */
.laps-section {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.laps-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.laps-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.laps-count {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.9rem;
}

.laps-actions {
    display: flex;
    gap: 10px;
}

/* 计次统计 */
.laps-stats {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding: 20px;
    background: var(--bg-primary);
    border-radius: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-value {
    font-family: 'SF Mono', monospace;
    font-size: 1.125rem;
    font-weight: 700;
}

.stat-value.best {
    color: var(--success-color);
}

.stat-value.worst {
    color: var(--danger-color);
}

.stat-value.average {
    color: var(--accent-primary);
}

/* 计次列表 */
.laps-container {
    max-height: 400px;
    overflow-y: auto;
}

.lap-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 10px;
    background: var(--bg-primary);
    border-left: 4px solid var(--border-color);
    transition: all 0.2s ease;
}

.lap-item:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 8px var(--shadow-color);
}

.lap-item.best {
    border-left-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.lap-item.worst {
    border-left-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.lap-number {
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 40px;
}

.lap-time {
    font-family: 'SF Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.lap-total {
    font-family: 'SF Mono', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* 使用说明 */
.info-section {
    margin-top: 30px;
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.info-section h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.keyboard-shortcuts {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

kbd {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 5px 10px;
    font-family: 'SF Mono', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 2px 0 var(--border-color);
}

/* 滚动条样式 */
.laps-container::-webkit-scrollbar {
    width: 6px;
}

.laps-container::-webkit-scrollbar-track {
    background: var(--bg-primary);
    border-radius: 3px;
}

.laps-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.laps-container::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* 移动端适配 */
@media (max-width: 600px) {
    .main-content {
        padding: 15px;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .timer-display {
        padding: 40px 20px;
    }

    .control-buttons {
        gap: 10px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }

    .btn-large {
        padding: 16px 32px;
        font-size: 1rem;
    }

    .input-block input {
        width: 70px;
        font-size: 1.25rem;
    }

    .lap-item {
        flex-direction: column;
        gap: 5px;
        text-align: center;
    }

    .laps-stats {
        flex-direction: column;
        gap: 10px;
    }

    .laps-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* 运行中动画 */
.timer-display.running {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 4px 20px var(--shadow-color); }
    50% { box-shadow: 0 4px 30px rgba(99, 102, 241, 0.3); }
}

/* 新增样式 */
.info-section p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 0;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li strong {
    color: var(--accent-primary);
}

.scene-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.scene-item {
    text-align: center;
    padding: 20px;
    background: var(--bg-primary);
    border-radius: 12px;
}

.scene-item i {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 10px;
}

.scene-item h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.scene-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.faq-item p {
    color: var(--text-secondary);
    margin: 0;
}