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

/* 页面主体样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #e8f0fe 0%, #f5e6f0 50%, #e6f2e8 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: #333;
}

/* 主容器 */
.container {
    max-width: 900px;
    width: 100%;
    text-align: center;
}

/* 页头区域 */
.header {
    margin-bottom: 50px;
    animation: fadeInDown 0.8s ease-out;
}

/* 网站主标题 */
.site-title {
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

/* 网站副标题 */
.site-subtitle {
    font-size: 1.1rem;
    color: #666;
    font-weight: 300;
}

/* 时间显示模块 */
.time-module {
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease-out 0.15s both;
}

/* 时间显示面板 */
.time-display {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px 60px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.6);
    display: inline-block;
    min-width: 600px;
}

/* 时间标签 */
.time-label {
    font-size: 0.95rem;
    color: #888;
    margin-bottom: 6px;
    font-weight: 300;
    letter-spacing: 4px;
}

.time-value {
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    letter-spacing: 4px;
}

.time-date {
    font-size: 1.1rem;
    color: #666;
    margin-top: 6px;
    font-weight: 400;
    letter-spacing: 2px;
}

.time-status {
    font-size: 0.75rem;
    color: #999;
    margin-top: 6px;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 60px;
}

.nav-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 32px 24px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.6);
    animation: fadeInUp 0.8s ease-out both;
    position: relative;
    overflow: hidden;
}

.nav-card:nth-child(1) {
    animation-delay: 0.1s;
}

.nav-card:nth-child(2) {
    animation-delay: 0.2s;
}

.nav-card:nth-child(3) {
    animation-delay: 0.3s;
}

.nav-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-card:hover::before {
    transform: scaleX(1);
}

.nav-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.15);
}

.nav-card.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.nav-card.disabled:hover {
    transform: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.nav-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.nav-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #444;
}

.nav-desc {
    font-size: 0.95rem;
    color: #777;
    line-height: 1.5;
}

.nav-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    color: #fff;
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 12px;
    margin-top: 12px;
    font-weight: 500;
}

.section {
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease-out both;
}

.section-title {
    font-size: 1.6rem;
    font-weight: 600;
    color: #444;
    margin-bottom: 24px;
    text-align: left;
    padding-left: 16px;
    border-left: 4px solid #667eea;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.tool-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 32px 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.6);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #43e97b, #38f9d7);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(67, 233, 123, 0.15);
}

.tool-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.tool-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #444;
}

.tool-desc {
    font-size: 0.95rem;
    color: #777;
    line-height: 1.5;
}

.footer {
    margin-top: auto;
    padding-top: 40px;
    animation: fadeIn 1s ease-out 0.5s both;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    font-size: 0.85rem;
    color: #888;
}

.footer-links a {
    color: #888;
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: #667eea;
}

.footer-divider {
    color: #ccc;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Fullscreen Clock Styles */
.clock-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #e8f0fe 0%, #f5e6f0 50%, #e6f2e8 100%);
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

.clock-overlay.active {
    display: flex;
    flex-direction: column;
}

.clock-header {
    display: flex;
    align-items: center;
    padding: 20px 30px;
    gap: 20px;
}

.clock-back-btn {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 12px;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 1rem;
    color: #667eea;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
}

.clock-back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
}

.clock-tabs {
    display: flex;
    gap: 10px;
    flex: 1;
    justify-content: center;
}

.clock-tab {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 12px;
    padding: 10px 24px;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
}

.clock-tab:hover {
    background: rgba(255, 255, 255, 0.8);
}

.clock-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-color: transparent;
}

.clock-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.clock-panel {
    display: none;
    text-align: center;
    width: 100%;
    max-width: 800px;
}

.clock-panel.active {
    display: block;
    animation: fadeInUp 0.3s ease-out;
}

/* Standard Time Panel */
.std-time-display {
    font-size: 8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    letter-spacing: 8px;
}

.std-date-display {
    font-size: 2rem;
    color: #666;
    margin-top: 20px;
    font-weight: 400;
    letter-spacing: 4px;
}

/* Stopwatch Panel */
.stopwatch-display {
    font-size: 6rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    letter-spacing: 4px;
}

.stopwatch-ms {
    font-size: 3rem;
    opacity: 0.7;
}

.stopwatch-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

.sw-btn {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    padding: 15px 40px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    min-width: 120px;
}

.sw-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
}

.sw-btn.start {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: #fff;
    border-color: transparent;
}

.sw-btn.pause {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: #fff;
    border-color: transparent;
}

.sw-btn.reset {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    color: #666;
    border-color: transparent;
}

.sw-btn.lap {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-color: transparent;
}

.stopwatch-laps {
    margin-top: 30px;
    max-height: 200px;
    overflow-y: auto;
}

.lap-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 8px;
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
}

.lap-item span:first-child {
    color: #888;
}

.lap-item span:last-child {
    color: #667eea;
    font-weight: 600;
}

/* Countdown Panel */
.countdown-input {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.countdown-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.countdown-input-group label {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 8px;
}

.countdown-input-group input {
    width: 80px;
    padding: 12px;
    font-size: 1.5rem;
    text-align: center;
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    font-family: 'Courier New', monospace;
}

.countdown-input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.countdown-display {
    font-size: 6rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    letter-spacing: 4px;
}

.countdown-display.warning {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 1s ease-in-out infinite;
}

.countdown-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

.cd-btn {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    padding: 15px 40px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    min-width: 120px;
}

.cd-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
}

.cd-btn.start {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: #fff;
    border-color: transparent;
}

.cd-btn.pause {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: #fff;
    border-color: transparent;
}

.cd-btn.reset {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    color: #666;
    border-color: transparent;
}

/* Pomodoro Panel */
.pomodoro-display {
    font-size: 6rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    letter-spacing: 4px;
}

.pomodoro-status {
    font-size: 1.5rem;
    color: #666;
    margin-top: 20px;
    font-weight: 400;
}

.pomodoro-status.work {
    color: #667eea;
}

.pomodoro-status.break {
    color: #43e97b;
}

.pomodoro-rounds {
    font-size: 1.1rem;
    color: #888;
    margin-top: 15px;
}

.pomodoro-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

.pomo-btn {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    padding: 15px 40px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    min-width: 120px;
}

.pomo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
}

.pomo-btn.start {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: #fff;
    border-color: transparent;
}

.pomo-btn.pause {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: #fff;
    border-color: transparent;
}

.pomo-btn.reset {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    color: #666;
    border-color: transparent;
}

.pomo-btn.skip {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-color: transparent;
}

.pomodoro-settings {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 30px;
}

.pomo-setting {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pomo-setting label {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 8px;
}

.pomo-setting input {
    width: 70px;
    padding: 10px;
    font-size: 1.2rem;
    text-align: center;
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    font-family: 'Courier New', monospace;
}

.pomo-setting input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@media (max-width: 768px) {
    body {
        padding: 30px 16px;
    }

    .site-title {
        font-size: 2.2rem;
    }

    .site-subtitle {
        font-size: 1rem;
    }

    .time-display {
        min-width: auto;
        width: 100%;
        padding: 30px 40px;
    }

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

    .time-date {
        font-size: 1.1rem;
    }

    .nav-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .nav-card {
        padding: 24px 20px;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .tool-card {
        padding: 24px 20px;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 10px;
    }

    .footer-divider {
        display: none;
    }

    /* 多功能时钟 - 平板适配 */
    .clock-header {
        padding: 15px 20px;
        gap: 15px;
    }

    .clock-back-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    .clock-tabs {
        flex-wrap: wrap;
        gap: 8px;
    }

    .clock-tab {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    .clock-content {
        padding: 15px;
    }

    /* 标准时间 - 平板 */
    .std-time-display {
        font-size: 5rem;
        letter-spacing: 6px;
    }

    .std-date-display {
        font-size: 1.5rem;
        letter-spacing: 2px;
    }

    /* 秒表 - 平板 */
    .stopwatch-display {
        font-size: 4rem;
        letter-spacing: 2px;
    }

    .stopwatch-ms {
        font-size: 2.5rem;
    }

    .stopwatch-controls {
        gap: 15px;
        margin-top: 30px;
    }

    .sw-btn {
        padding: 12px 30px;
        font-size: 1rem;
        min-width: 100px;
    }

    /* 倒计时 - 平板 */
    .countdown-input {
        flex-wrap: wrap;
        gap: 10px;
        margin-bottom: 20px;
    }

    .countdown-input-group input {
        width: 70px;
        padding: 10px;
        font-size: 1.3rem;
    }

    .countdown-display {
        font-size: 4rem;
        letter-spacing: 2px;
    }

    .countdown-controls {
        gap: 15px;
        margin-top: 30px;
    }

    .cd-btn {
        padding: 12px 30px;
        font-size: 1rem;
        min-width: 100px;
    }

    /* 番茄钟 - 平板 */
    .pomodoro-display {
        font-size: 4rem;
        letter-spacing: 2px;
    }

    .pomodoro-status {
        font-size: 1.3rem;
    }

    .pomodoro-rounds {
        font-size: 1rem;
    }

    .pomodoro-controls {
        gap: 15px;
        margin-top: 30px;
    }

    .pomo-btn {
        padding: 12px 30px;
        font-size: 1rem;
        min-width: 100px;
    }

    .pomodoro-settings {
        flex-wrap: wrap;
        gap: 20px;
    }

    .pomo-setting input {
        width: 65px;
        padding: 8px;
        font-size: 1.1rem;
    }

    .stopwatch-laps {
        margin-top: 20px;
        max-height: 180px;
    }

    .lap-item {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 20px 12px;
    }

    .site-title {
        font-size: 1.8rem;
    }

    .header {
        margin-bottom: 30px;
    }

    .time-module {
        margin-bottom: 30px;
    }

    .time-display {
        padding: 20px 25px;
        border-radius: 16px;
        min-width: auto;
    }

    .time-label {
        font-size: 0.85rem;
        letter-spacing: 2px;
    }

    .time-value {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .time-date {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }

    .time-status {
        font-size: 0.7rem;
    }

    .nav-grid {
        margin-bottom: 35px;
    }

    .section {
        margin-bottom: 35px;
    }

    .nav-card,
    .tool-card {
        padding: 20px 16px;
    }

    .nav-icon,
    .tool-icon {
        font-size: 2rem;
    }

    .nav-title,
    .tool-title {
        font-size: 1.2rem;
    }

    .nav-desc,
    .tool-desc {
        font-size: 0.85rem;
    }

    /* 多功能时钟 - 手机适配 */
    .clock-overlay.active {
        display: flex;
    }

    .clock-header {
        padding: 12px 15px;
        gap: 10px;
        flex-wrap: wrap;
    }

    .clock-back-btn {
        padding: 8px 14px;
        font-size: 0.85rem;
        order: 1;
        flex: 0 0 auto;
    }

    .clock-tabs {
        order: 2;
        flex: 1 1 100%;
        justify-content: center;
        gap: 6px;
    }

    .clock-tab {
        padding: 8px 12px;
        font-size: 0.8rem;
        flex: 1;
        max-width: 120px;
    }

    .clock-content {
        padding: 10px;
    }

    .clock-panel {
        max-width: 100%;
    }

    /* 标准时间 - 手机 */
    .std-time-display {
        font-size: 3rem;
        letter-spacing: 3px;
    }

    .std-date-display {
        font-size: 1.1rem;
        letter-spacing: 1px;
    }

    /* 秒表 - 手机 */
    .stopwatch-display {
        font-size: 2.5rem;
        letter-spacing: 1px;
    }

    .stopwatch-ms {
        font-size: 1.8rem;
    }

    .stopwatch-controls {
        gap: 10px;
        margin-top: 25px;
        flex-wrap: wrap;
    }

    .sw-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        min-width: 80px;
        width: 100%;
        max-width: 140px;
    }

    .stopwatch-laps {
        margin-top: 15px;
        max-height: 150px;
    }

    .lap-item {
        padding: 8px 12px;
        font-size: 0.8rem;
        gap: 8px;
    }

    /* 倒计时 - 手机 */
    .countdown-input {
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 15px;
        justify-content: center;
    }

    .countdown-input-group label {
        font-size: 0.75rem;
        margin-bottom: 5px;
    }

    .countdown-input-group input {
        width: 60px;
        padding: 8px;
        font-size: 1.1rem;
    }

    .countdown-display {
        font-size: 2.5rem;
        letter-spacing: 1px;
    }

    .countdown-controls {
        gap: 10px;
        margin-top: 25px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .cd-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        min-width: 80px;
        width: 100%;
        max-width: 140px;
    }

    /* 番茄钟 - 手机 */
    .pomodoro-display {
        font-size: 2.5rem;
        letter-spacing: 1px;
    }

    .pomodoro-status {
        font-size: 1.1rem;
    }

    .pomodoro-rounds {
        font-size: 0.9rem;
    }

    .pomodoro-controls {
        gap: 10px;
        margin-top: 25px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .pomo-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        min-width: 80px;
        width: 100%;
        max-width: 140px;
    }

    .pomodoro-settings {
        flex-wrap: wrap;
        gap: 15px;
        justify-content: center;
        margin-top: 20px;
    }

    .pomo-setting label {
        font-size: 0.75rem;
        margin-bottom: 5px;
    }

    .pomo-setting input {
        width: 60px;
        padding: 8px;
        font-size: 1rem;
    }
}

/* 超小屏幕适配（如 iPhone SE 等） */
@media (max-width: 320px) {
    body {
        padding: 15px 10px;
    }

    .site-title {
        font-size: 1.5rem;
        margin-bottom: 8px;
    }

    .site-subtitle {
        font-size: 0.85rem;
    }

    .header {
        margin-bottom: 25px;
    }

    .time-module {
        margin-bottom: 25px;
    }

    .time-display {
        padding: 15px 18px;
        border-radius: 12px;
    }

    .time-label {
        font-size: 0.75rem;
        letter-spacing: 1px;
    }

    .time-value {
        font-size: 1.6rem;
        letter-spacing: 1px;
    }

    .time-date {
        font-size: 0.8rem;
        letter-spacing: 0.5px;
    }

    .time-status {
        font-size: 0.65rem;
    }

    .nav-grid,
    .tools-grid {
        gap: 12px;
    }

    .nav-card,
    .tool-card {
        padding: 16px 12px;
    }

    .nav-icon,
    .tool-icon {
        font-size: 1.8rem;
        margin-bottom: 12px;
    }

    .nav-title,
    .tool-title {
        font-size: 1.1rem;
    }

    .nav-desc,
    .tool-desc {
        font-size: 0.8rem;
    }

    .section-title {
        font-size: 1.1rem;
        margin-bottom: 16px;
    }

    /* 多功能时钟 - 超小屏幕 */
    .clock-header {
        padding: 10px 12px;
        gap: 8px;
    }

    .clock-back-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .clock-tabs {
        gap: 5px;
    }

    .clock-tab {
        padding: 6px 10px;
        font-size: 0.75rem;
    }

    .clock-content {
        padding: 8px;
    }

    .std-time-display {
        font-size: 2.5rem;
        letter-spacing: 2px;
    }

    .std-date-display {
        font-size: 0.95rem;
    }

    .stopwatch-display {
        font-size: 2rem;
    }

    .stopwatch-ms {
        font-size: 1.5rem;
    }

    .stopwatch-controls {
        gap: 8px;
        margin-top: 20px;
    }

    .sw-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
        min-width: 70px;
    }

    .countdown-input {
        gap: 6px;
    }

    .countdown-input-group label {
        font-size: 0.7rem;
    }

    .countdown-input-group input {
        width: 55px;
        padding: 6px;
        font-size: 1rem;
    }

    .countdown-display {
        font-size: 2rem;
    }

    .countdown-controls {
        gap: 8px;
        margin-top: 20px;
    }

    .cd-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
        min-width: 70px;
    }

    .pomodoro-display {
        font-size: 2rem;
    }

    .pomodoro-status {
        font-size: 1rem;
    }

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

    .pomodoro-controls {
        gap: 8px;
        margin-top: 20px;
    }

    .pomo-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
        min-width: 70px;
    }

    .pomodoro-settings {
        gap: 12px;
    }

    .pomo-setting label {
        font-size: 0.7rem;
    }

    .pomo-setting input {
        width: 55px;
        padding: 6px;
        font-size: 0.9rem;
    }
}