/* Core Optimized CSS - Phase 1.2 Complete Optimization */
/* 合并所有CSS文件，减少HTTP请求，保持所有业务逻辑完整性 */

/* ====== 从 main.css 合并的完整样式 ====== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --background-primary: #ffffff;
    --background-secondary: #f8f9fa;
    --background-card: #ffffff;
    --border-color: #e1e5e9;
    --border-hover: #c1c7cd;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.12);
    --glow-color: rgba(0, 102, 204, 0.2);

    /* Additional Colors for Blog */
    --background-hover: #f0f4f8;
    --background-code: #f8f9fa;
    --background-code-inline: #e9ecef;
    --border-light: #f0f0f0;
    --success-color: #28a745;
    --primary-color-light: rgba(0, 102, 204, 0.1);
    --primary-dark: #004080;
    --primary-darker: #003366;

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-medium: 0.25s ease;
    --transition-slow: 0.4s ease;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-secondary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-medium), color var(--transition-medium);

    /* Font loading optimization */
    font-display: swap;
    text-rendering: optimizeLegibility;
    -webkit-font-feature-settings: "kern" 1;
    font-feature-settings: "kern" 1;
    font-kerning: normal;
    font-synthesis: none;
}

/* Dark Theme Support */
[data-theme="dark"] {
    --primary-color: #4a9eff;
    --primary-hover: #357abd;
    --text-primary: #e1e5e9;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --background-primary: #1a1a1a;
    --background-secondary: #2d2d2d;
    --background-card: #2d2d2d;
    --border-color: #404040;
    --border-hover: #606060;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.5);
    --glow-color: rgba(74, 158, 255, 0.3);

    /* Additional Colors for Blog - Dark Theme */
    --background-hover: #374151;
    --background-code: #1f2937;
    --background-code-inline: #374151;
    --border-light: #4b5563;
    --success-color: #10b981;
    --primary-color-light: rgba(74, 158, 255, 0.1);
    --primary-dark: #60a5fa;
    --primary-darker: #93c5fd;
}

[data-theme="dark"] .header {
    background: rgba(26, 26, 26, 0.95);
    border-bottom-color: var(--border-color);
}

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

[data-theme="dark"] .theme-toggle:hover {
    background: var(--background-secondary);
    border-color: var(--border-hover);
}

[data-theme="dark"] .toast {
    background: #2d7a3d;
    color: #ffffff;
    border: 1px solid #4caf50;
}

/* Part 1: Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--background-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo .logo-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    line-height: 1.2;
}

.logo .logo-title a {
    text-decoration: none;
    color: inherit;
    transition: opacity var(--transition-fast);
}

.logo .logo-title a:hover {
    opacity: 0.8;
}

.main-nav {
    display: flex;
    align-items: center;
    margin-left: auto;
    margin-right: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    display: block;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--background-hover);
}

.nav-link.active {
    color: var(--primary-color);
    background-color: var(--primary-color-light);
    font-weight: 600;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.language-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.language-selector label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.language-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--background-primary);
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.language-select:hover {
    border-color: var(--border-hover);
}

.language-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.25rem;
}

.theme-toggle:hover {
    background: var(--background-secondary);
    border-color: var(--border-hover);
}

/* Main Content */
.main-content {
    margin-top: 64px;
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.main-content.blog-main {
    margin-top: 0;
    padding-top: var(--spacing-xl);
}

/* Part 2: Hero Section - CRITICAL STYLES */
.hero-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    margin-top: 64px;
}

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

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-title {
    font-size: 6.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    line-height: 1.2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.static-hero-content {
    display: none;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.dynamic-hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.noscript-hero-content {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
    line-height: 1.3;
    padding: var(--spacing-lg);
    background: var(--background-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.static-hero-content.visible,
.noscript-hero-content.visible {
    display: block;
}

.dynamic-hero-content.hidden {
    display: none;
}

noscript .dynamic-hero-content {
    display: none !important;
}

noscript .noscript-hero-content {
    display: block !important;
}

.huge-number {
    font-size: 1em;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.hero-title-suffix {
    font-size: 0.2em;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    margin-top: var(--spacing-xs);
}

.hero-secondary {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-actions {
    margin-top: var(--spacing-xl);
    display: flex;
    justify-content: center;
}

.hero-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    box-shadow: var(--shadow-medium);
}

.hero-button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

/* Part 3: Info Dashboard - CRITICAL STYLES */
.info-dashboard {
    margin-bottom: var(--spacing-3xl);
}

.dashboard-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.info-card {
    background: var(--background-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color), var(--shadow-medium);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-icon {
    font-size: 1.25rem;
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.info-row-full {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
}

.info-row-full .info-label {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.info-row-full .copy-btn {
    position: absolute;
    right: 0;
    top: 0;
    margin: 0;
    flex-shrink: 0;
}

.info-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.info-value {
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-family-mono);
    font-size: 0.875rem;
    background: var(--background-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-right: 4rem;
    font-display: swap;
    font-variant-ligatures: common-ligatures;
    -webkit-font-feature-settings: "liga" 1, "calt" 1;
    font-feature-settings: "liga" 1, "calt" 1;
}

.info-value-textarea {
    width: 100%;
    min-height: 80px;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--background-secondary);
    font-family: var(--font-family-mono);
    font-size: 0.75rem;
    color: var(--text-primary);
    resize: vertical;
    line-height: 1.4;
    word-wrap: break-word;
    word-break: break-all;
    font-display: swap;
    font-variant-ligatures: common-ligatures;
    -webkit-font-feature-settings: "liga" 1, "calt" 1;
    font-feature-settings: "liga" 1, "calt" 1;
}

.copy-btn {
    position: absolute;
    right: 0;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    opacity: 0.7;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    opacity: 1;
}

.copy-btn.copied {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

/* Part 4: Tool Introduction Section - CRITICAL STYLES */
.tool-intro {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: var(--background-secondary);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    border: 1px solid var(--border-color);
}

.tool-intro-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.tool-intro-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.tool-intro-description {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.tool-intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.tool-intro-item {
    background: var(--background-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.tool-intro-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.tool-intro-item-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.tool-intro-icon {
    font-size: 1.25rem;
}

.tool-intro-item-description {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0;
}

/* Part 5: Interactive Toolbar */
.interactive-toolbar {
    margin-bottom: var(--spacing-3xl);
}

.toolbar-container {
    text-align: center;
}

.toolbar-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.toolbar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--background-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-medium);
    box-shadow: var(--shadow-light);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color), var(--shadow-heavy);
}

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

.tool-title {
    font-weight: 600;
    font-size: 1rem;
}

/* Part 6: FAQ Section */
.faq-section {
    margin-bottom: var(--spacing-3xl);
}

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

.faq-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--background-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    border-bottom: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    position: relative;
    outline: none;
}

.faq-question:hover {
    background: var(--background-secondary);
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    font-weight: 300;
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-item.active .faq-question {
    border-bottom: none;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium);
    border-top: none;
    background: var(--background-card);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    border: none;
}

/* Part 7: Footer */
.footer {
    background: var(--background-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-3xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

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

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #28a745;
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-medium);
    transform: translateX(100%);
    transition: transform var(--transition-medium), opacity var(--transition-medium);
    z-index: 10000;
    max-width: 280px;
    word-wrap: break-word;
    font-size: 0.875rem;
    line-height: 1.4;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    display: none;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    display: block;
}

.toast-message {
    font-weight: 500;
    display: block;
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.detecting {
    animation: pulse 1.5s ease-in-out infinite;
}

.hero-title,
.info-value {
    transition: all var(--transition-medium);
}

/* Focus styles for accessibility */
.copy-btn:focus,
.tool-card:focus,
.faq-question:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Error Message Styles */
.error-message {
    background: #fff3f3;
    border: 1px solid #ffcdd2;
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    text-align: center;
    color: #d32f2f;
}

.error-message h2 {
    color: #d32f2f;
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.25rem;
}

.error-message p {
    color: #666;
    margin: 0 0 var(--spacing-lg) 0;
    line-height: 1.6;
}

.error-message button {
    background: #d32f2f;
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.error-message button:hover {
    background: #b71c1c;
}

/* Dashboard Header Styles - for "Copy All" functionality */
.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.dashboard-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.copy-all-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-light);
}

.copy-all-btn:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.copy-all-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-light);
}

.copy-all-btn.copied {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.copy-all-btn::before {
    content: "📋";
    font-size: 1rem;
}

.copy-all-btn.copied::before {
    content: "✓";
    font-size: 1rem;
}

/* ====== 从 language-selector.css 合并的样式 ====== */
.language-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.25rem;
    color: var(--text-primary);
}

.language-button:hover {
    background: var(--background-secondary);
    border-color: var(--border-hover);
}

/* ====== Language Modal Styles (从 main.css 合并) ====== */
.language-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.language-modal.show {
    opacity: 1;
    visibility: visible;
}

.language-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.language-modal-content {
    position: relative;
    background: var(--background-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    max-width: 90vw;
    max-height: 90vh;
    width: 100%;
    max-width: 800px;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-medium);
}

.language-modal.show .language-modal-content {
    transform: scale(1);
}

.language-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--background-secondary);
}

.language-modal-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-title-primary {
    display: block;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.modal-title-secondary {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.language-modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.language-modal-close:hover {
    background: var(--background-hover);
    color: var(--text-primary);
}

.close-icon {
    font-size: 1.5rem;
    line-height: 1;
    font-weight: 300;
}

.language-modal-body {
    padding: var(--spacing-xl);
    max-height: 60vh;
    overflow-y: auto;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.language-card {
    display: block;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    background: var(--background-card);
    transition: all var(--transition-medium);
    position: relative;
    cursor: pointer;
}

.language-card:hover {
    text-decoration: none;
    color: var(--text-primary);
}

.language-card.active:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: var(--background-primary);
}

.language-card.disabled {
    background: var(--background-secondary);
    color: var(--text-secondary);
    border-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.6;
}

.language-card.disabled:hover {
    border-color: var(--border-color);
    transform: none;
    box-shadow: none;
    background: var(--background-secondary);
}

.language-card.disabled .flag {
    opacity: 0.5;
}

.language-card.disabled::after {
    content: attr(data-coming-soon);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(108, 117, 125, 0.9);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    white-space: nowrap;
    pointer-events: none;
}

.flag {
    display: inline-block;
    width: 4.5rem !important;
    height: 2.8rem !important;
    border-radius: 10px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
    margin-bottom: 1.2rem;
    line-height: 1;
    vertical-align: middle;
    background: #eee;
    overflow: hidden;
    object-fit: cover;
}

.language-card .flag {
    margin-bottom: 1.2rem;
}

.lang-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}

.lang-code {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    font-weight: 500;
}

.language-modal-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
    padding: var(--spacing-lg);
    background: var(--background-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.note-icon {
    font-size: 1rem;
    margin-right: var(--spacing-xs);
}

/* Mobile-specific modal styles */
@media (max-width: 768px) {
    .language-modal {
        align-items: flex-end;
        padding: 0;
    }

    .language-modal-content {
        max-width: 100%;
        width: 100%;
        max-height: 80vh;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        transform: translateY(100%);
    }

    .language-modal.show .language-modal-content {
        transform: translateY(0);
    }

    .language-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: var(--spacing-md);
    }

    .language-card {
        padding: var(--spacing-md);
    }

    .flag {
        width: 3.2rem;
        height: 2rem;
        margin-bottom: 0.8rem;
    }

    .lang-name {
        font-size: 0.875rem;
    }

    .lang-code {
        font-size: 0.75rem;
    }

    .modal-title-primary {
        font-size: 1.25rem;
    }

    .modal-title-secondary {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .language-modal-header,
    .language-modal-body {
        padding: var(--spacing-lg);
    }

    .language-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .language-card {
        padding: var(--spacing-sm);
    }

    .flag {
        width: 2.2rem;
        height: 1.4rem;
    }

    .lang-name {
        font-size: 0.8rem;
    }

    .lang-code {
        font-size: 0.7rem;
    }
}

/* Dark theme adjustments for language modal */
[data-theme="dark"] .language-modal-backdrop {
    background: rgba(0, 0, 0, 0.7);
}

[data-theme="dark"] .language-card.disabled::after {
    background: rgba(74, 85, 104, 0.9);
    color: #e2e8f0;
}

/* ====== 从 internal-links.css 合并的样式 ====== */
.internal-links-section {
    padding: var(--spacing-2xl) 0;
    background: var(--background-secondary);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    border: 1px solid var(--border-color);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.internal-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.internal-link-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--background-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-medium);
    box-shadow: var(--shadow-light);
}

.internal-link-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color), var(--shadow-medium);
}

.link-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.link-content {
    flex: 1;
    min-width: 0;
}

.link-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.link-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: block;
}

.link-arrow {
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.internal-link-card:hover .link-arrow {
    transform: translateX(2px);
}

.internal-links-loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.loading-text {
    display: inline-block;
    animation: pulse 1.5s ease-in-out infinite;
}

/* ====== 从 mobile-performance.css 合并的关键样式 ====== */

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero-title {
        font-size: 2.5rem;
        gap: var(--spacing-xs);
    }

    .hero-title-suffix {
        font-size: 0.25em;
        letter-spacing: 0.05em;
    }

    .dashboard-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .toolbar-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .header-container {
        padding: 0 0.25rem;
        height: 56px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 0.125rem;
    }

    .logo {
        flex: 0 0 auto;
        min-width: 0;
        max-width: 28%;
        margin-right: 0.125rem;
    }

    .logo .logo-title {
        font-size: 0.8rem;
        max-width: 100%;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin: 0;
        line-height: 1.1;
    }

    .main-nav {
        flex: 1 1 auto;
        display: flex;
        justify-content: center;
        margin: 0;
        min-width: 0;
    }

    .nav-menu {
        display: flex;
        gap: 0.125rem;
        margin: 0;
        padding: 0;
        justify-content: center;
        flex-wrap: nowrap;
        list-style: none;
    }

    .nav-item {
        flex-shrink: 0;
    }

    .nav-link {
        padding: 0.25rem 0.375rem;
        font-size: 0.75rem;
        border-radius: var(--radius-sm);
        background: rgba(0, 102, 204, 0.1);
        color: var(--primary-color);
        font-weight: 500;
        white-space: nowrap;
        min-height: 26px;
        display: flex;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        transition: all 0.2s ease;
    }

    .nav-link:hover,
    .nav-link.active {
        background: var(--primary-color);
        color: white;
    }

    .header-controls {
        flex: 0 0 auto;
        display: flex;
        gap: 0.0625rem;
        align-items: center;
        margin-left: 0.125rem;
    }

    .language-button,
    .theme-toggle {
        min-height: 32px;
        min-width: 32px;
        padding: 0.1875rem;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-sm);
        background: var(--background-primary);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .language-button:hover,
    .theme-toggle:hover {
        background: var(--background-secondary);
        border-color: var(--primary-color);
    }

    .language-button .language-text {
        display: none;
    }

    .language-button .language-icon,
    .theme-toggle .theme-icon {
        font-size: 0.875rem;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .info-row {
        padding: var(--spacing-sm) 0;
    }

    .info-label {
        font-size: 0.875rem;
    }

    .info-value {
        font-size: 0.875rem;
        margin-right: var(--spacing-xl);
    }

    .copy-btn {
        font-size: 0.8125rem;
    }

    .toast {
        top: 80px;
        left: 10px;
        right: 10px;
        max-width: calc(100vw - 20px);
        width: auto;
        transform: translateY(-100%);
        font-size: 0.8rem;
        padding: var(--spacing-sm) var(--spacing-md);
        display: none;
    }

    .toast.show {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        display: block;
    }

    .tool-intro {
        padding: var(--spacing-xl) var(--spacing-md);
        margin: var(--spacing-lg) 0;
    }

    .tool-intro-title {
        font-size: 1.25rem;
    }

    .tool-intro-description {
        font-size: 1rem;
    }

    .tool-intro-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .tool-intro-item {
        padding: var(--spacing-md);
    }

    .tool-intro-item-title {
        font-size: 1rem;
    }

    .tool-intro-item-description {
        font-size: 0.875rem;
    }

    .internal-links-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .internal-link-card {
        padding: var(--spacing-md);
    }

    .dashboard-header {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .dashboard-title {
        text-align: center;
    }

    .copy-all-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 3rem;
        gap: var(--spacing-xs);
    }

    .hero-title-suffix {
        font-size: 0.22em;
        letter-spacing: 0.03em;
    }

    .info-card {
        padding: var(--spacing-lg);
    }

    .tool-card {
        padding: var(--spacing-lg);
    }

    .header-container {
        padding: 0 0.375rem;
        height: 52px;
        gap: 0.125rem;
    }

    .logo {
        max-width: 32%;
        margin-right: 0.125rem;
    }

    .logo .logo-title {
        font-size: 0.875rem;
        max-width: 100%;
    }

    .nav-menu {
        gap: 0.125rem;
    }

    .nav-link {
        padding: 0.25rem 0.375rem;
        font-size: 0.75rem;
        min-height: 26px;
        max-height: 26px;
        line-height: 1;
        box-sizing: border-box;
    }

    .header-controls {
        gap: 0.0625rem;
        margin-left: 0.125rem;
    }

    .language-button,
    .theme-toggle {
        min-height: 32px;
        min-width: 32px;
        padding: 0.2rem;
    }

    .language-button .language-icon,
    .theme-toggle .theme-icon {
        font-size: 0.9rem;
    }

    .info-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        position: relative;
        flex-wrap: nowrap;
        gap: var(--spacing-xs);
        min-height: 32px;
    }

    .info-label {
        flex: 0 0 auto;
        margin-right: var(--spacing-sm);
        font-size: 0.8125rem;
        white-space: nowrap;
    }

    .info-value {
        flex: 1 1 auto;
        margin-right: var(--spacing-lg);
        margin-bottom: 0;
        font-size: 0.8125rem;
        padding: var(--spacing-xs);
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .copy-btn {
        position: absolute;
        right: 0;
        flex: 0 0 auto;
        font-size: 0.75rem;
        padding: var(--spacing-xs);
        min-width: 28px;
    }

    .toast {
        top: 70px;
        left: 8px;
        right: 8px;
        max-width: calc(100vw - 16px);
        font-size: 0.75rem;
        padding: var(--spacing-sm);
        transform: translateY(-100%);
        display: none;
    }

    .toast.show {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        display: block;
    }

    .tool-intro {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .tool-intro-item {
        padding: var(--spacing-sm);
    }

    .internal-link-card {
        padding: var(--spacing-sm);
    }

    .dashboard-title {
        font-size: 1.25rem;
    }

    .copy-all-btn {
        font-size: 0.875rem;
        padding: var(--spacing-md);
    }
}

/* Small Screen Optimization (320px and below) */
@media (max-width: 320px) {
    .header-container {
        padding: 0 0.25rem;
        height: 48px;
        gap: 0.0625rem;
    }

    .logo {
        max-width: 28%;
        margin-right: 0.0625rem;
    }

    .logo .logo-title {
        font-size: 0.8rem;
        max-width: 100%;
        line-height: 1.1;
    }

    .nav-menu {
        gap: 0.0625rem;
    }

    .nav-link {
        padding: 0.25rem 0.375rem;
        font-size: 0.75rem;
        min-height: 26px;
        max-height: 26px;
        line-height: 1;
        box-sizing: border-box;
    }

    .header-controls {
        gap: 0.03125rem;
        margin-left: 0.0625rem;
    }

    .language-button,
    .theme-toggle {
        min-height: 28px;
        min-width: 28px;
        padding: 0.15rem;
    }

    .language-button .language-icon,
    .theme-toggle .theme-icon {
        font-size: 0.8rem;
    }

    .info-label {
        font-size: 0.75rem;
        margin-right: var(--spacing-xs);
    }

    .info-value {
        font-size: 0.75rem;
        padding: 2px var(--spacing-xs);
        margin-right: 32px;
    }

    .copy-btn {
        font-size: 0.7rem;
        padding: 2px 4px;
        min-width: 24px;
    }
}

/* Dark Theme Adjustments */
[data-theme="dark"] .hero-section {
    background: linear-gradient(135deg, #1f2937, #374151);
}

[data-theme="dark"] .section-title {
    color: #f1f5f9;
}

[data-theme="dark"] .dashboard-title {
    color: #f1f5f9;
}

[data-theme="dark"] .card-title {
    color: #f1f5f9;
}

[data-theme="dark"] .tool-title {
    color: #f1f5f9;
}

[data-theme="dark"] .faq-title {
    color: #f1f5f9;
}

[data-theme="dark"] .internal-link-card:hover {
    box-shadow: 0 0 0 1px var(--primary-color), var(--shadow-medium);
}

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

[data-theme="dark"] .copy-btn.copied {
    background: #28a745;
    color: white;
}

/* Performance Optimizations */
html, body {
    overflow-x: hidden;
}

/* Prevent layout shifts */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    z-index: 1000;
}

.main-content {
    margin-top: 64px;
}

/* Smooth transitions for dynamic content */
.toast,
.internal-link-card,
.faq-item {
    transition: all var(--transition-medium);
}

/* Font loading states */
.font-loading {
    visibility: hidden;
}

.font-loaded,
.font-fallback-active {
    visibility: visible;
}

.font-fallback-active * {
    font-family: var(--font-family-base) !important;
}

.font-fallback-active code,
.font-fallback-active pre,
.font-fallback-active .code,
.font-fallback-active .mono {
    font-family: var(--font-family-mono) !important;
}

/* Accessibility improvements */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10001;
}

.skip-link:focus {
    top: 6px;
}

/* Reduce repaints by using transform instead of layout changes */
.toast,
.internal-link-card {
    will-change: transform;
}

/* Optimize images */
img {
    max-width: 100%;
    height: auto;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Better scrolling performance */
html {
    scroll-behavior: smooth;
}

/* GPU acceleration for animations */
.toast,
.internal-link-card,
.header {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Device Pages Styles */
.breadcrumb {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
    animation-delay: 0.2s;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--primary-hover);
}

.devices-hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-2xl) 0;
    margin-top: -32px;
    text-align: center;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.1s;
}

.devices-hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.devices-hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-lg) 0;
    line-height: 1.2;
}

.devices-hero-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.device-table-section {
    padding: var(--spacing-2xl) 0;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.4s;
}

.table-container {
    background: var(--background-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-light);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.device-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.device-table th {
    background: var(--background-secondary);
    color: var(--text-primary);
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.device-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.device-table tr:hover {
    background: var(--background-hover);
}

.device-table tr:last-child td {
    border-bottom: none;
}

/* Dark theme adjustments for device pages */
[data-theme="dark"] .devices-hero-section {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .devices-hero-title {
    color: #f1f5f9;
}

[data-theme="dark"] .devices-hero-subtitle {
    color: #cbd5e1;
    opacity: 0.9;
}

[data-theme="dark"] .device-table th {
    background: #374151;
    color: var(--text-primary);
}

[data-theme="dark"] .device-table tr:hover {
    background: #374151;
}