/* CSS 變數 - 顏色主題 */
:root {
    --primary-color: #667eea;
    --primary-hover: #5a6fd8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --glass-bg: rgba(255, 255, 255, 0.1);
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --text-white: #ffffff;
    
    --border-color: #e5e7eb;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

/* 全域樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

/* 容器 */
.container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
    margin-top: 2rem;
    margin-bottom: 2rem;
    flex: 1;
}

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

/* 標題區域 */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-white);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-section {
    flex: 0 0 auto;
}

.app-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.app-logo:hover {
    opacity: 0.8;
}

.nav-section {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-link:hover {
    color: white;
}

.nav-link.active {
    color: white;
    font-weight: 500;
}

.profile-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.profile-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
}

.user-section.hidden {
    display: none;
}

.logout-btn {
    background: #ef4444 !important;
    color: white !important;
    border: 1px solid #dc2626 !important;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    text-decoration: none;
}

.logout-btn:hover {
    background: #dc2626 !important;
    border-color: #b91c1c !important;
    color: white !important;
}

/* 主要內容 */
.main-content {
    padding: 2rem 1.5rem;
}

/* 輸入區域 */
.input-section {
    margin-bottom: 2rem;
}

.input-container {
    display: flex;
    gap: 0.75rem;
    align-items: stretch;
    flex-wrap: wrap;
}

/* 心情選擇器 */
.mood-selector {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0.5rem;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    align-items: center;
}

.mood-btn {
    padding: 0.5rem;
    border: 2px solid transparent;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.mood-btn:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
}

.mood-btn.active {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.05);
}

[data-theme="dark"] .mood-btn {
    background: rgba(255, 255, 255, 0.1);
    border-color: transparent;
}

[data-theme="dark"] .mood-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .mood-btn.active {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.2);
}

/* 心情記錄項目樣式 */
.mood-indicator {
    font-size: 1.5rem;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.mood-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mood-time {
    color: var(--text-light);
    font-size: 0.8rem;
    opacity: 0.7;
}

[data-theme="dark"] .mood-time {
    color: var(--text-secondary);
}

/* 響應式心情選擇器 */
@media (max-width: 640px) {
    .input-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .mood-selector {
        order: 2;
        justify-content: center;
    }
    
    .mood-btn {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.2rem;
    }
}

.task-input {
    flex: 1;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.task-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.category-select {
    padding: 1rem 1.25rem;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    transition: border-color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    cursor: pointer;
    min-width: 150px;
    color: var(--text-primary);
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 3rem;
}

.category-select:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

.category-select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), var(--shadow-lg);
    transform: translateY(-1px);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

.category-select option {
    padding: 0.75rem 1rem;
    background: white;
    color: var(--text-primary);
    font-weight: 500;
}

[data-theme="dark"] .category-select option {
    background: #1f2937;
    color: var(--text-primary);
}

.add-btn {
    padding: 1rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 80px;
    justify-content: center;
}

.add-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* 篩選區域 */
.filter-section {
    margin-bottom: 2rem;
}

.filter-container {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.filter-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--border-radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-primary);
}

.filter-btn.active {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    font-weight: 600;
}

/* 任務清單 */
.task-section {
    margin-bottom: 2rem;
}

.task-list {
    list-style: none;
    space-y: 0.75rem;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    transition: var(--transition);
    animation: slideIn 0.3s ease-out;
}

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

.task-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.task-item.completed {
    opacity: 0.7;
    background: #f9fafb;
}

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

.task-checkbox {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    background: white;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.task-checkbox:hover {
    border-color: var(--success-color);
}

.task-checkbox.checked {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.task-checkbox.checked::after {
    content: '✓';
    font-size: 0.875rem;
    font-weight: bold;
}

/* 自定義 checkbox 樣式（用於 HTML checkbox） */
.custom-checkbox {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
    flex-shrink: 0;
}

.task-checkbox:checked + .custom-checkbox {
    background: var(--success-color);
    border-color: var(--success-color);
}

.task-checkbox:checked + .custom-checkbox::after {
    content: '✓';
    color: white;
    font-size: 0.875rem;
    font-weight: bold;
}

/* 隱藏原始 checkbox */
.task-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.task-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.task-label {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.task-text {
    font-size: 1rem;
    line-height: 1.5;
    word-break: break-word;
}

.task-category {
    font-size: 0.75rem;
    font-weight: 500;
    opacity: 0.8;
    padding: 0.2rem 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: 0.25rem;
    display: inline-block;
    max-width: fit-content;
}

[data-theme="dark"] .task-category {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.task-input-edit {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    background: white;
}

.task-input-edit:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

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

.task-btn {
    padding: 0.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.edit-btn {
    background: var(--warning-color);
    color: white;
}

.edit-btn:hover {
    background: #d97706;
}

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

.delete-btn:hover {
    background: #dc2626;
}

.save-btn {
    background: var(--success-color);
    color: white;
}

.save-btn:hover {
    background: #059669;
}

.cancel-btn {
    background: var(--text-secondary);
    color: white;
}

.cancel-btn:hover {
    background: #4b5563;
}

/* 編輯輸入框 */
.edit-input {
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem;
    font-size: 1rem;
    font-family: var(--font-family);
    width: 100%;
    outline: none;
    transition: var(--transition);
}

.edit-input:focus {
    border-color: var(--primary-hover);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 空狀態 */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* 頁腳 */
.footer {
    background: #f9fafb;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.clear-btn {
    padding: 0.75rem 1rem;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-btn:hover {
    background: #dc2626;
}

.clear-btn:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

.show-hidden-btn {
    padding: 0.75rem 1rem;
    background: var(--text-secondary);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 0.5rem;
}

.show-hidden-btn:hover {
    background: #4b5563;
}

.task-stats {
    color: var(--text-secondary);
    font-weight: 500;
}

.stats-text {
    font-size: 0.9rem;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .nav-section {
        gap: 0.75rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .theme-toggle {
        width: 2rem;
        height: 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 640px) {
    .container {
        border-radius: var(--border-radius-sm);
        margin: 1rem;
        margin-top: 1rem;
        margin-bottom: 1rem;
    }
    
    .header {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .app-logo {
        text-align: center;
    }
    
    .nav-section {
        gap: 0.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
    
    .user-section {
        justify-content: center;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    
    .main-content {
        padding: 1.5rem 1rem;
    }
    
    .input-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .category-select {
        min-width: 100%;
        order: 2;
    }
    
    .add-btn {
        padding: 1rem;
        order: 3;
    }
    
    .filter-container {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .filter-btn {
        padding: 0.875rem;
    }
    
    .task-item {
        padding: 0.875rem;
        gap: 0.75rem;
    }
    
    .task-actions {
        opacity: 1;
    }
    
    .footer {
        padding: 1rem;
    }
    
    .footer-actions {
        flex-direction: column;
        text-align: center;
    }
}

/* 動畫效果 */
.task-item.removing {
    animation: slideOut 0.3s ease-in forwards;
}

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(100%);
        height: 0;
        padding: 0;
        margin: 0;
    }
}

/* 聚焦可見性 */
.task-checkbox:focus,
.filter-btn:focus,
.add-btn:focus,
.clear-btn:focus,
.task-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 主題切換按鈕 */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.1);
}

.user-profile-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.user-profile-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

/* 深色模式變數 */
[data-theme="dark"] {
    --card-bg: rgba(31, 41, 55, 0.95);
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --border-color: #374151;
    --bg-gradient: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

[data-theme="dark"] body {
    background: #111827;
    color: var(--text-primary);
}

[data-theme="dark"] .container {
    background: var(--card-bg);
    border-color: var(--border-color);
}

[data-theme="dark"] .task-input,
[data-theme="dark"] .task-item,
[data-theme="dark"] .edit-input {
    background: #1f2937;
    color: var(--text-primary);
    border-color: var(--border-color);
}

[data-theme="dark"] .category-select {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: transparent;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23d1d5db' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

[data-theme="dark"] .category-select:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(102, 126, 234, 0.5);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23d1d5db' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

[data-theme="dark"] .category-select:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23d1d5db' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

[data-theme="dark"] .footer {
    background: #1f2937;
    border-color: var(--border-color);
}

/* 網站底部樣式 */
.site-footer {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-text {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
    text-align: center;
}

.footer-link {
    color: var(--text-white);
    text-decoration: underline;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.footer-link:hover {
    opacity: 0.8;
}

/* 深色模式下的網站底部 */
[data-theme="dark"] .site-footer {
    background: rgba(31, 41, 55, 0.8);
    border-top-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .footer-link {
    color: var(--text-white);
}

/* 響應式設計 */
@media (max-width: 768px) {
    .site-footer {
        padding: 1rem;
    }
    
    .footer-text {
        font-size: 0.8rem;
    }
}

[data-theme="dark"] .filter-btn {
    background: #374151;
    color: var(--text-primary);
    border-color: var(--border-color);
}

[data-theme="dark"] .filter-btn.active {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .empty-state {
    color: var(--text-secondary);
}

[data-theme="dark"] .custom-checkbox {
    background: #374151;
    border-color: var(--border-color);
}

[data-theme="dark"] .task-checkbox:checked + .custom-checkbox {
    background: var(--success-color);
    border-color: var(--success-color);
}

/* 用戶資料模態框樣式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

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

.modal {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

[data-theme="dark"] .modal {
    background: #1f2937;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="dark"] .modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: flex;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: white;
    color: var(--text-primary);
    font-family: inherit;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: #374151;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

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

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

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

.btn-secondary:hover {
    background: #4b5563;
}

/* 自動暗模式支援 */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --card-bg: rgba(31, 41, 55, 0.95);
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-light: #9ca3af;
        --border-color: #374151;
        --bg-gradient: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    }
    
    body:not([data-theme="light"]) {
        background: #111827;
        color: var(--text-primary);
    }
}