:root {
    /* Material Design 3 Color System */
    --md-sys-color-primary: #0099ff;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #F9DEDC;
    --md-sys-color-on-error-container: #410E0B;
    --md-sys-color-background: #FFFBFE;
    --md-sys-color-on-background: #1C1B1F;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #e0e9ec;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-inverse-on-surface: #F5F0F6;
    --md-sys-color-inverse-surface: #313033;
    --md-sys-color-inverse-primary: #bcd9ff;

    /* Custom colors for our app */
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #F44336;

    /* Typography */
    --md-sys-typescale-display-large-font-size: 2.5rem;
    --md-sys-typescale-display-medium-font-size: 2rem;
    --md-sys-typescale-display-small-font-size: 1.5rem;
    --md-sys-typescale-headline-large-font-size: 1.5rem;
    --md-sys-typescale-headline-medium-font-size: 1.25rem;
    --md-sys-typescale-headline-small-font-size: 1rem;
    --md-sys-typescale-body-large-font-size: 1rem;
    --md-sys-typescale-body-medium-font-size: 0.875rem;
    --md-sys-typescale-body-small-font-size: 0.75rem;

    /* Shape */
    --md-sys-shape-corner-extra-small: 4px;
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;

    /* Elevation */
    --md-sys-elevation-1: 0 1px 3px 1px rgba(0, 0, 0, 0.15), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --md-sys-elevation-2: 0 2px 6px 2px rgba(0, 0, 0, 0.15), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --md-sys-elevation-3: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px 0 rgba(0, 0, 0, 0.3);

    /* Transition */
    --md-sys-motion-duration-short1: 50ms;
    --md-sys-motion-duration-short2: 100ms;
    --md-sys-motion-duration-medium1: 200ms;
    --md-sys-motion-duration-medium2: 300ms;
    --md-sys-motion-duration-long1: 400ms;
    --md-sys-motion-duration-long2: 500ms;

    /* Theme transition */
    --theme-transition: background-color var(--md-sys-motion-duration-medium2) ease,
        color var(--md-sys-motion-duration-medium2) ease;
}

.dark-mode {
    --md-sys-color-primary: #0099ff;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #1e293b;
    --md-sys-color-on-primary-container: #e2e8f0;
    --md-sys-color-background: #0f172a;
    --md-sys-color-on-background: #f1f5f9;
    --md-sys-color-surface: #1e293b;
    --md-sys-color-on-surface: #f8fafc;
    --md-sys-color-surface-variant: #334155;
    --md-sys-color-on-surface-variant: #cbd5e1;
    --md-sys-color-outline: #64748b;
    --md-sys-color-inverse-on-surface: #1e293b;
    --md-sys-color-inverse-surface: #f1f5f9;
    --md-sys-color-inverse-primary: #0f172a;
    --md-sys-color-secondary-container: #334155;
    --md-sys-color-on-secondary-container: #e2e8f0;
    --md-sys-color-input-text: #f8fafc;
}

/* 添加默认模式下的下拉框文字颜色变量 */
:root {
    --dropdown-text-color: #1C1B1F;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--md-sys-color-on-background);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    background: var(--md-sys-color-background);
    transition: var(--theme-transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 30px;
}

.header {
    flex: 1;
    text-align: left;
}

.header h1 {
    font-size: var(--md-sys-typescale-headline-medium-font-size);
    color: var(--md-sys-color-primary);
    margin-bottom: 5px;
    font-weight: 600;
}

.header .time {
    font-size: var(--md-sys-typescale-body-medium-font-size);
    color: var(--md-sys-color-secondary);
    font-weight: 400;
}

.tasks {
    flex: 1;
    text-align: right;
    padding-left: 20px;
}

.tasks h2 {
    font-size: var(--md-sys-typescale-headline-medium-font-size);
    color: var(--md-sys-color-primary);
    margin-bottom: 10px;
    font-weight: 600;
}

.tasks p {
    font-size: var(--md-sys-typescale-body-medium-font-size);
    margin-bottom: 8px;
    color: var(--md-sys-color-on-surface-variant);
}

.deadline {
    background: var(--danger-color);
    color: white;
    padding: 12px 20px;
    border-radius: var(--md-sys-shape-corner-small);
    font-weight: 600;
    display: inline-block;
    margin-top: 1px;
    width: 100%;
    margin-bottom: 5px;
    transition: all var(--md-sys-motion-duration-medium2) ease;
}

.deadline.warning {
    background: var(--warning-color);
}

.deadline.normal {
    background: var(--success-color);
}

.main-content {
    max-width: 1200px;
    margin: 30px auto;
    background: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: var(--md-sys-elevation-2);
    padding: 25px;
    transition: var(--theme-transition);
}

.date-selector-container {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.date-selector-container label {
    font-weight: 500;
    color: var(--md-sys-color-on-surface-variant);
    font-size: var(--md-sys-typescale-body-medium-font-size);
}

.date-picker-container {
    position: relative;
    display: inline-block;
    flex: 1;
}

.date-picker-input {
    padding: 12px 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    font-size: var(--md-sys-typescale-body-medium-font-size);
    background: var(--md-sys-color-surface);
    cursor: pointer;
    min-width: 200px;
    width: 100%;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    color: var(--md-sys-color-on-surface, #1C1B1F);
}

.date-picker-input:focus {
    outline: none;
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 2px rgba(103, 80, 164, 0.2);
}

.date-picker-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: 300px;
    overflow-y: auto;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    box-shadow: var(--md-sys-elevation-3);
    z-index: 1000;
    display: none;
    margin-top: 5px;
    transition: var(--theme-transition);
}

.date-picker-option {
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--md-sys-color-surface-variant);
    transition: background-color var(--md-sys-motion-duration-short2) ease;
    /* 直接使用现有的颜色变量 */
    color: var(--md-sys-color-on-surface);
}


.date-picker-option:last-child {
    border-bottom: none;
}

.date-picker-option:hover {
    background-color: var(--md-sys-color-primary-container);
}

.date-picker-option.selected {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.date-picker-open {
    display: block;
}

.date-navigation {
    display: flex;
    justify-content: space-between;
    padding: 10px 15px;
    border-bottom: 1px solid var(--md-sys-color-outline);
}

.nav-btn {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--md-sys-color-primary);
    padding: 5px;
    border-radius: 50%;
    transition: background-color var(--md-sys-motion-duration-short2) ease;
}

.nav-btn:hover {
    background-color: var(--md-sys-color-surface-variant);
}

.current-month-year {
    font-weight: 500;
    color: var(--md-sys-color-primary);
}

.mode-toggle-container {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-left: 15px;
}

.toggle-btn {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    padding: 12px 24px;
    border-radius: var(--md-sys-shape-corner-medium);
    cursor: pointer;
    font-size: var(--md-sys-typescale-body-medium-font-size);
    font-weight: 500;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    box-shadow: var(--md-sys-elevation-1);
}

.toggle-btn:hover {
    background: var(--md-sys-color-primary);
    box-shadow: var(--md-sys-elevation-2);
    transform: translateY(-2px);
}

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

.current-date {
    font-size: var(--md-sys-typescale-headline-small-font-size);
    color: var(--md-sys-color-primary);
    margin-bottom: 20px;
    font-weight: 600;
}

.subjects-container {
    display: grid;
    gap: 15px;
}

.subject-title {
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 16px;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    background: var(--md-sys-color-surface-variant);
}

.subject-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--md-sys-color-outline);
}

.subject-icon {
    width: 40px;
    height: 40px;
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 16px;
    margin-right: 12px;
    flex-shrink: 0;
}

.subject-name {
    font-size: var(--md-sys-typescale-headline-small-font-size);
    font-weight: 600;
    color: var(--md-sys-color-on-surface);
}

.task-list {
    list-style: none;
}

.task-item {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    padding: 12px 16px;
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    transition: all var(--md-sys-motion-duration-short2) ease;
    cursor: pointer;
    box-shadow: var(--md-sys-elevation-1);
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--md-sys-elevation-2);
    border-color: var(--md-sys-color-primary);
}

.task-item.selected {
    border: 2px solid var(--md-sys-color-primary);
    background-color: var(--md-sys-color-primary-container);
}

.task-item.completed {
    background: var(--md-sys-color-secondary-container);
    border-color: var(--md-sys-color-secondary);
}

.task-item.completed.selected {
    background: var(--md-sys-color-primary-container);
    border-color: var(--md-sys-color-primary);
}

.task-checkbox {
    margin-right: 12px;
    transform: scale(1.2);
    cursor: pointer;
    accent-color: var(--md-sys-color-primary);
}

.task-content {
    flex: 1;
    font-size: var(--md-sys-typescale-body-medium-font-size);
    line-height: 1.5;
}

.task-footer {
    font-size: var(--md-sys-typescale-body-small-font-size);
    color: var(--md-sys-color-on-surface-variant);
    margin-top: 6px;
    font-weight: 500;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--md-sys-color-surface-variant);
    border-radius: 4px;
    margin: 15px 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--md-sys-color-primary);
    border-radius: 4px;
    transition: width var(--md-sys-motion-duration-medium2) ease;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
    padding: 16px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-medium);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: var(--md-sys-typescale-display-small-font-size);
    font-weight: bold;
    color: var(--md-sys-color-primary);
}

.stat-label {
    font-size: var(--md-sys-typescale-body-small-font-size);
    color: var(--md-sys-color-on-surface-variant);
}

.no-tasks {
    text-align: center;
    padding: 40px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: var(--md-sys-typescale-body-medium-font-size);
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-medium);
    border: 1px dashed var(--md-sys-color-outline);
}

.no-tasks i {
    font-size: 36px;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 10px;
}

/* 番茄钟样式 - Material Design 3风格 */
.tomato-container {
    display: none;
    padding: 25px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-large);
    background: var(--md-sys-color-surface);
    box-shadow: var(--md-sys-elevation-2);
    margin-top: 20px;
    transition: all var(--md-sys-motion-duration-medium2) ease;
}

.tomato-container.active {
    display: block;
}

.tomato-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--md-sys-color-outline);
}

.tomato-title {
    font-size: var(--md-sys-typescale-headline-medium-font-size);
    font-weight: 600;
    color: var(--md-sys-color-primary);
}

.tomato-current-task {
    font-size: var(--md-sys-typescale-body-large-font-size);
    margin: 25px 0;
    padding: 20px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-medium);
    border: 1px solid var(--md-sys-color-outline);
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    word-break: break-word;
    text-align: center;
}

.tomato-progress {
    width: 200px;
    height: 200px;
    position: relative;
    margin: 30px auto;
}

.tomato-progress-circle {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--md-sys-color-surface-variant);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--md-sys-elevation-1);
    border: 1px solid var(--md-sys-color-outline);
}

.tomato-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    clip: rect(0, 200px, 200px, 100px);
}

.tomato-progress-bar.full {
    clip: rect(auto, auto, auto, auto);
}

.tomato-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--md-sys-color-primary);
    transform: rotate(0deg);
    transition: transform 0.1s linear;
    clip: rect(0, 100px, 200px, 0);
}

.tomato-progress-inner {
    position: absolute;
    width: 160px;
    height: 160px;
    background: var(--md-sys-color-surface);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-surface);
    font-size: 1.2rem;
    z-index: 2;
    box-shadow: inset 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--md-sys-color-outline);
}

#tomatoTimer {
    font-size: 2.5rem;
    font-weight: 300;
    font-family: 'Courier New', monospace;
    color: var(--md-sys-color-primary);
    margin-bottom: 8px;
}

.timer-status {
    font-size: 1rem;
    color: var(--md-sys-color-primary);
    font-weight: 400;
}

.tomato-session-counter {
    font-size: var(--md-sys-typescale-body-large-font-size);
    color: var(--md-sys-color-on-surface);
    margin: 20px 0;
    text-align: center;
}

.tomato-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.tomato-btn {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    padding: 12px 24px;
    border-radius: var(--md-sys-shape-corner-medium);
    cursor: pointer;
    font-size: var(--md-sys-typescale-body-medium-font-size);
    font-weight: 500;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    min-width: 100px;
    box-shadow: var(--md-sys-elevation-1);
}

.tomato-btn:hover {
    background: var(--md-sys-color-primary);
    box-shadow: var(--md-sys-elevation-2);
    transform: scale(1.05);
}

.tomato-btn:active {
    transform: scale(1);
}

.tomato-btn.active {
    background: var(--md-sys-color-secondary);
}

.tomato-btn.reset {
    background: var(--md-sys-color-error);
}

.tomato-btn.reset:hover {
    background: var(--md-sys-color-error);
}

@media (max-width: 768px) {
    .tomato-progress {
        width: 160px;
        height: 160px;
    }

    .tomato-progress-inner {
        width: 128px;
        height: 128px;
    }

    .tomato-progress-bar {
        clip: rect(0, 160px, 160px, 80px);
    }

    .tomato-progress-fill {
        clip: rect(0, 80px, 160px, 0);
    }

    #tomatoTimer {
        font-size: 2rem;
    }

    .tomato-btn {
        padding: 10px 20px;
        min-width: 80px;
    }

    .container {
        flex-direction: column;
        gap: 15px;
    }

    .notification {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
        padding: 12px 16px;
    }

    @keyframes slideInRight {
        from {
            opacity: 0;
            transform: translateY(-100%);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}


.floating-action {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: var(--md-sys-color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary);
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--md-sys-elevation-2);
    z-index: 999;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    border: none;
}

.floating-action:hover {
    background: var(--md-sys-color-primary);
    transform: scale(1.1);
}

.selection-feedback {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 12px 24px;
    border-radius: var(--md-sys-shape-corner-medium);
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--md-sys-motion-duration-medium2) ease;
}

.selection-feedback.show {
    opacity: 1;
}

.mode-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 56px;
    height: 56px;
    background: var(--md-sys-color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary);
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--md-sys-elevation-2);
    z-index: 999;
    transition: all var(--md-sys-motion-duration-medium2) ease;
    border: none;
}

.mode-toggle:hover {
    background: var(--md-sys-color-primary);
    transform: scale(1.1);
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: var(--md-sys-typescale-body-medium-font-size);
}

.loading-spinner {
    border: 4px solid var(--md-sys-color-surface-variant);
    border-top: 4px solid var(--md-sys-color-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 0 auto 20px;
}

/* 通知样式 */
.notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    padding: 10px;
}

/* 修改单个通知为相对定位 */
.notification {
    position: relative;
    padding: 12px 20px;
    background: var(--success-color);
    color: white;
    border-radius: var(--md-sys-shape-corner-small);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInRight 0.3s ease-out;
    max-width: 350px;
    border: none;
    box-shadow: 0 2px 6px 2px rgba(0, 0, 0, 0.15), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    min-width: 300px;
}

/* 不同类型的通知样式 */
.notification.success {
    background: var(--success-color);
}

.notification.info {
    background: var(--md-sys-color-primary);
}

.notification.warning {
    background: var(--warning-color);
}

/* 确保与 deadline 样式保持一致 */
.deadline,
.notification {
    font-size: var(--md-sys-typescale-body-medium-font-size);
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: 0.025em;
}

/* 淡出动画 */
.notification.fade-out {
    opacity: 0;
    transform: translateX(100%);
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: -10px;
    overflow: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, max-height 0.3s ease, padding 0.3s ease, margin 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 任务完成动画 */
@keyframes taskComplete {
    0% {
        transform: scale(1);
        box-shadow: var(--md-sys-elevation-1);
    }

    50% {
        transform: scale(1.02);
        box-shadow: var(--md-sys-elevation-3);
    }

    100% {
        transform: scale(1);
        box-shadow: var(--md-sys-elevation-1);
    }
}

.task-item.completed {
    animation: taskComplete 0.3s ease-out;
    border-color: var(--success-color);
}

.task-item.completed .task-content {
    text-decoration: line-through;
    opacity: 0.7;
}

.task-item.completed .task-checkbox:checked {
    accent-color: var(--success-color);
}


@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

html {
    scroll-behavior: smooth;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--md-sys-color-surface-variant);
}

::-webkit-scrollbar-thumb {
    background: var(--md-sys-color-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--md-sys-color-primary);
}

.tasks-container {
    display: block;
}

.tasks-container.hidden {
    display: none;
}

/* 主题切换过渡动画 */
body {
    transition: var(--theme-transition);
}

.theme-transition {
    transition: var(--theme-transition);
}