:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #a7f3d0;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --radius: 10px;
    --radius-lg: 14px;
    --transition: all 0.2s ease-in-out;
}

.dark-mode {
    --primary: #34d399;
    --primary-dark: #10b981;
    --primary-light: #065f46;
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;
    --border-light: #1e293b;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.2), 0 1px 2px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: var(--background);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
    margin: 0;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* 移动端布局调整 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
    }
    
    .logo {
        flex: 1;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .header-actions {
        flex-shrink: 0;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.25rem;
    }
}

/* 其余CSS代码保持不变 */
/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    flex: 1;
}

/* Sidebar */
.sidebar {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    height: fit-content;
    position: sticky;
    top: 7rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
}

/* 权限请求按钮 */
.permission-btn-container {
    margin-bottom: 2rem;
}

.permission-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    background: var(--primary);
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.permission-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.permission-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.controls-section {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.control-group label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label .info-icon {
    color: var(--text-muted);
    cursor: help;
}

.preview-text {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-primary);
    resize: vertical;
    min-height: 90px;
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.5;
    transition: var(--transition);
}

.preview-text:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.range-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.range-value {
    min-width: 3.5rem;
    text-align: center;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.875rem;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

.select-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.875rem;
}

.select-group select {
    width: 100%;
}

select {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    min-width: 0;
}

.display-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    padding: 1.25rem 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
    flex-wrap: wrap;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.display-options {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.display-option {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.display-option select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.stats-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    padding: 1.25rem 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
    margin-bottom: 1.5rem;
}

.stats {
    display: flex;
    gap: 2rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--primary);
}

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

.search-box {
    position: relative;
    width: 300px;
    min-width: 250px;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Font Grid - 动态列数 */
.font-grid {
    display: grid;
    gap: 1.75rem;
    transition: grid-template-columns 0.3s ease;
}

.font-grid.columns-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.font-grid.columns-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.font-grid.columns-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.font-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    height: 100%;
    min-height: 320px;
    max-height: 400px;
}

.font-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.font-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    min-height: 50px;
}

.font-name {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.font-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.icon-btn {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background);
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

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

.font-preview {
    height: 180px;
    padding: 1.25rem;
    background: var(--background);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
    overflow: auto;
    line-height: 1.5;
    flex-grow: 1;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
    white-space: normal;
    hyphens: auto;
    resize: none;
    width: 100%;
    display: block;
}

.font-preview:hover {
    background: var(--primary-light);
    color: var(--text-primary);
}

.font-details {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    padding-top: 0.875rem;
    border-top: 1px solid var(--border);
    min-height: 50px;
}

.font-detail {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.font-detail-label {
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-sm {
    padding: 0.625rem 1.25rem;
    font-size: 0.75rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3.5rem;
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

.empty-state-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.875rem;
    max-width: 300px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.625rem;
    margin-top: 2.5rem;
}

.pagination-btn {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    margin: 0 1.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.625rem;
    border-radius: 8px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--background);
    color: var(--text-primary);
}

/* Introduction Section */
.intro-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin: 3rem 0 2rem 0;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
}

.intro-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.intro-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.feature-card {
    background: var(--background);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 3rem 0 2rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.footer-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.footer-section p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    max-width: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* 弹出式提醒 */
.popup-alert {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    z-index: 1000;
    max-width: 500px;
    width: 90%;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.popup-alert.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.popup-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.popup-icon {
    width: 48px;
    height: 48px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--warning);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.popup-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
}

.popup-content {
    margin-bottom: 1.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.popup-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

/* Tutorial Section - 卡片布局 */
.tutorial-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.tutorial-header {
    text-align: center;
    margin-bottom: 1.75rem;
}

.tutorial-header h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.tutorial-header p {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.tutorial-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tutorial-card {
    background: var(--background);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    height: 100%;
}

.tutorial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.tutorial-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tutorial-step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.tutorial-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.tutorial-card-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

.tutorial-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.tutorial-card-icon {
    width: 60px;
    height: 60px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 1200px) {
    .font-grid.columns-4 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    
    .container {
        padding: 0 2rem;
    }
}

@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
    }
    
    .font-grid.columns-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    
    .container {
        padding: 0 1.5rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
    }
    
    .logo {
        flex: 1;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .header-actions {
        flex-shrink: 0;
    }
    
    .display-controls,
    .stats-bar {
        flex-direction: column;
        gap: 1.25rem;
    }
    
    .search-box {
        width: 100%;
        min-width: auto;
    }
    
    .font-grid.columns-3,
    .font-grid.columns-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    
    .select-group {
        grid-template-columns: 1fr;
    }

    .stats {
        flex-wrap: wrap;
        gap: 1.25rem;
    }

    .intro-section {
        padding: 1.5rem;
        margin: 2rem 0 2rem 0;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .tutorial-cards {
        grid-template-columns: 1fr;
    }
    
    .popup-alert {
        padding: 1.5rem;
        width: 95%;
    }
    
    .popup-actions {
        flex-direction: column;
    }

    .footer-section p {
        white-space: normal;
        text-overflow: unset;
    }
}

@media (max-width: 640px) {
    .font-grid.columns-2,
    .font-grid.columns-3,
    .font-grid.columns-4 {
        grid-template-columns: 1fr;
    }
    
    .stats {
        flex-direction: column;
        gap: 1rem;
    }

    .main-layout {
        padding: 1.5rem 0;
    }

    .intro-header h2 {
        font-size: 1.5rem;
    }

    .intro-header p {
        font-size: 1rem;
    }
    
    .font-card {
        min-height: 300px;
        max-height: 360px;
    }
    
    .font-preview {
        height: 160px;
    }
    
    .tutorial-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.25rem;
    }
}