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

/* 简化的页面加载效果，减少动画开销 */
body {
    opacity: 1;
}

/* 移除不必要的加载指示器 */
.loading-indicator {
    display: none;
}

:root {
    /* 主色调系统 - 从#0d9488（青色/绿色）衍生 */
    --primary-color: #0d9488;
    --primary-hover: #0f766e;
    --primary-50: #f0fdfa;
    --primary-100: #ccfbf1;
    --primary-200: #99f6e4;
    --primary-300: #5eead4;
    --primary-400: #2dd4bf;
    --primary-500: #10b981;
    --primary-600: #059669;
    --primary-700: #047857;
    --primary-800: #065f46;
    --primary-900: #064e3b;
    
    /* 辅助色调系统 */
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    /* 功能色彩 */
    --success-500: #10b981;
    --success-600: #059669;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --info-500: #0d9488;
    --info-600: #0f766e;
    
    /* 中性色彩 */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* 背景和表面 */
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-hover: #f1f5f9;
    --surface-active: #e2e8f0;
    
    /* 文本颜色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverted: #ffffff;
    
    /* 边框和分割线 */
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --border-active: #94a3b8;
    
    /* 阴影效果 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(13, 148, 136, 0.3);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Menlo', monospace;
    
    /* 过渡效果 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
    --gradient-primary-intense: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 50%, var(--primary-600) 100%);
    --gradient-primary-soft: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-200) 100%);
    --gradient-primary-glow: linear-gradient(135deg, rgba(13, 148, 136, 0.1) 0%, rgba(15, 118, 110, 0.1) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-400) 0%, var(--secondary-600) 100%);
    --gradient-secondary-soft: linear-gradient(135deg, var(--secondary-100) 0%, var(--secondary-200) 100%);
    --gradient-accent: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-400) 100%);
    --gradient-accent-soft: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    --gradient-accent-intense: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 100%);
    --gradient-success: linear-gradient(135deg, var(--success-500) 0%, var(--success-600) 100%);
    --gradient-danger: linear-gradient(135deg, var(--danger-500) 0%, var(--danger-600) 100%);
    --gradient-warning: linear-gradient(135deg, var(--warning-500) 0%, var(--warning-600) 100%);
    --gradient-info: linear-gradient(135deg, var(--info-500) 0%, var(--info-600) 100%);
    --gradient-background: linear-gradient(135deg, var(--neutral-50) 0%, var(--surface) 100%);
    --gradient-card: linear-gradient(180deg, var(--background) 0%, var(--surface) 100%);
    --gradient-card-hover: linear-gradient(180deg, var(--background) 0%, var(--primary-50) 100%);
    --gradient-card-intense: linear-gradient(145deg, var(--surface) 0%, rgba(13, 148, 136, 0.05) 100%);
    --gradient-btn-primary: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    --gradient-btn-primary-hover: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
    --gradient-btn-accent: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-400) 100%);
    --gradient-btn-accent-hover: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
}

body {
    font-family: var(--font-sans);
    background: var(--surface);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1248px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--border);
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    font-weight: 800;
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
    padding: 0.5rem;
    border-radius: var(--radius-lg);
    background: none;
    flex-shrink: 0;
    color: var(--primary-400);
}

.logo:hover {
    transform: translateY(-2px) scale(1.02);
    background: none;
    color: var(--success-600);
}

.logo i {
    font-size: 2rem;
    color: var(--primary-400);
    background: none;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: unset;
    background-clip: unset;
    position: relative;
    z-index: 1;
    transition: all var(--transition-normal);
}

.logo:hover i {
    color: var(--success-600);
    transform: rotate(10deg) scale(1.1);
}

.logo span {
    position: relative;
    z-index: 1;
    color: var(--primary-400);
    background: none;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: unset;
    background-clip: unset;
}

.logo:hover span {
    color: var(--success-600);
}

.logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.nav {
    display: flex;
    gap: 0.125rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 12px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    transition: color 0.2s ease;
    white-space: nowrap;
}

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

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

.nav-link i {
    font-size: 1rem;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border);
    margin: 0.5rem 0;
}

.language-selector {
    position: relative;
    flex-shrink: 0;
}

.language-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--border);
    background: var(--background);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s;
    z-index: 1001;
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.language-item:hover {
    background: var(--surface);
    color: var(--primary-color);
}

.main {
    flex: 1;
    padding: 3rem 0;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
    padding: 4rem 1.5rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
    transform: translate(-50%, -50%);
    z-index: 0;
    opacity: 0;
    animation: fadeIn 1s ease 0.5s forwards;
}

.hero > * {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
    transform: translateY(20px);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    animation: fadeInUp 1s ease 0.3s forwards;
    opacity: 0;
    transform: translateY(20px);
}

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

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

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

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

.hero-features {
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-top: 2rem;
    opacity: 0;
    animation: fadeIn 1s ease 0.6s forwards;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.hero-feature:nth-child(1) {
    animation: fadeInUp 0.8s ease 0.8s forwards;
}

.hero-feature:nth-child(2) {
    animation: fadeInUp 0.8s ease 1s forwards;
}

.hero-feature:nth-child(3) {
    animation: fadeInUp 0.8s ease 1.2s forwards;
}

.hero-feature:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero-feature i {
    font-size: 1.125rem;
    color: var(--primary-color);
}

.converter-section {
    margin-bottom: 4rem;
}

.converter-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.converter-card {
    background: linear-gradient(145deg, var(--background) 0%, var(--surface) 100%);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-slow);
    border: 2px solid var(--border);
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    opacity: 0;
    transform: translateY(30px) scale(0.95);
}

.converter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-slow);
    z-index: 2;
}

.converter-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1;
}

.converter-card:hover {
    transform: translateY(-8px) scale(1.03) rotateX(2deg);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
    background: linear-gradient(145deg, var(--surface) 0%, var(--background) 100%);
}

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

.card-icon {
    width: 4rem;
    height: 4rem;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    transition: all var(--transition-normal);
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-md);
}

.converter-card:hover .card-icon {
    transform: scale(1.1) rotate(10deg);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    transition: all var(--transition-normal);
    position: relative;
    z-index: 2;
}

.converter-card:hover .card-title {
    color: var(--primary-color);
}

.card-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    transition: all var(--transition-normal);
    position: relative;
    z-index: 2;
}

.card-btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-md);
}

.card-btn:hover {
    background: var(--primary-50);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.card-btn:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    background: var(--primary-100);
}

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

.card-btn.accent:hover {
    background: var(--primary-50);
    border-color: var(--primary-color);
}

.card-btn span {
    position: relative;
    z-index: 2;
}

.how-to-use {
    margin-bottom: 4rem;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
    font-size: 1.125rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
}

.step-number {
    width: 3.5rem;
    height: 3.5rem;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.step-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.features {
    margin-bottom: 4rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: var(--gradient-card);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-slow);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-slow);
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
    background: var(--gradient-card-hover);
}

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 4.5rem;
    height: 4.5rem;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    z-index: 1;
}

.feature-item:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.supported-tools {
    margin-bottom: 4rem;
}

.tools-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 2rem;
    background: var(--gradient-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-xl);
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.tool-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.tool-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tool-item:hover::before {
    opacity: 1;
}

.tool-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: all var(--transition-normal);
    position: relative;
    z-index: 1;
}

.tool-item span {
    position: relative;
    z-index: 1;
}

.tool-item:hover i {
    transform: scale(1.2) rotate(5deg);
}

.friendly-links {
    margin-bottom: 4rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.75rem;
    background: var(--gradient-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-xl);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.link-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.link-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.link-item:hover::before {
    opacity: 1;
}

.link-item i {
    font-size: 1.125rem;
    color: var(--primary-color);
    transition: all var(--transition-normal);
    position: relative;
    z-index: 1;
}

.link-item span {
    position: relative;
    z-index: 1;
    transition: all var(--transition-normal);
}

.link-item:hover i {
    transform: translateX(4px);
}

.link-item:hover span {
    transform: translateX(4px);
}

.page-hero {
    text-align: center;
    margin-bottom: 3rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.converter-workflow {
    margin-bottom: 4rem;
}

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.workflow-step {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    position: relative;
}

.workflow-step .step-number {
    position: absolute;
    top: -1.75rem;
    left: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
}

.workflow-step .step-content {
    padding-top: 1rem;
}

.converter-interface {
    margin-bottom: 4rem;
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
    .converter-container {
        grid-template-columns: 1fr;
    }
}

/* 全面响应式设计 - 平板和移动设备 */
@media (max-width: 1024px) {
    .nav {
        gap: 0.75rem;
    }
    
    .nav-link {
        padding: 0.625rem 1rem;
        font-size: 0.8125rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    /* 导航栏响应式 */
    .nav {
        display: none;
    }
    
    .header {
        padding: 1rem 0;
    }
    
    /* 英雄区响应式 */
    .hero {
        padding: 3rem 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .hero-feature {
        padding: 0.75rem 1rem;
        font-size: 0.8125rem;
    }
    
    /* 转换卡片响应式 */
    .converter-cards {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .converter-card {
        padding: 1.5rem;
    }
    
    /* 步骤响应式 */
    .steps {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    /* 特性网格响应式 */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* 工具网格响应式 */
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }
    
    /* 链接网格响应式 */
    .links-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    /* 页脚响应式 */
    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
    
    .footer-section {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.9375rem;
    }
    
    .card-btn {
        padding: 0.625rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .tool-item {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
}

.editor-panel,
.preview-panel {
    background: var(--background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-title i {
    color: var(--primary-color);
}

.panel-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 2rem;
    height: 2rem;
    border: 1px solid var(--border);
    background: var(--background);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.markdown-editor {
    flex: 1;
    width: 100%;
    border: none;
    padding: 1.5rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    background: var(--background);
    min-height: 400px;
}

.markdown-editor::placeholder {
    color: var(--text-secondary);
}

.editor-footer {
    padding: 0.75rem 1.5rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.char-count {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.preview-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    background: var(--background);
    min-height: 400px;
}

.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4,
.preview-content h5,
.preview-content h6 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.preview-content h1 {
    font-size: 2rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

.preview-content h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.25rem;
}

.preview-content h3 {
    font-size: 1.25rem;
}

.preview-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.preview-content ul,
.preview-content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.preview-content li {
    margin-bottom: 0.25rem;
}

.preview-content code {
    background: var(--surface);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: 0.875rem;
}

.preview-content pre {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow-x: auto;
}

.preview-content pre code {
    background: none;
    padding: 0;
}

.preview-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.preview-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.preview-content a:hover {
    text-decoration: underline;
}

.preview-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1rem 0;
}

.preview-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.preview-content th,
.preview-content td {
    border: 1px solid var(--border);
    padding: 0.5rem;
    text-align: left;
}

.preview-content th {
    background: var(--surface);
    font-weight: 600;
}

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

.convert-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-md);
}

.convert-btn.primary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-full);
}

.convert-btn.primary:hover {
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.convert-btn.primary:active {
    background: var(--primary-100);
    transform: translateY(0);
}

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

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

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

.syntax-examples {
    margin-bottom: 4rem;
}

.example-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    justify-content: center;
}

.example-tab {
    padding: 0.75rem 2rem;
    border: 2px solid var(--border);
    background: var(--background);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.example-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.example-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.example-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .example-content {
        grid-template-columns: 1fr;
    }
}

.example-panel {
    background: var(--background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.example-header {
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    color: var(--text-primary);
}

.example-code {
    padding: 1.5rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    overflow-x: auto;
    background: var(--background);
    margin: 0;
}

.example-preview {
    padding: 1.5rem;
    min-height: 300px;
}

.syntax-support {
    margin-bottom: 4rem;
}

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

.support-item {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}

.support-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.support-icon {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-400) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.support-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.support-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.why-choose {
    margin-bottom: 4rem;
}

.choose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.choose-item {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}

.choose-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.choose-icon {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 1rem;
    background: var(--surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.choose-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.choose-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq {
    margin-bottom: 4rem;
}

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

.faq-item {
    background: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.faq-question i {
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 1.75rem;
}

.footer-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-text {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

.footer-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--text-secondary);
    text-decoration: underline;
}

@media (max-width: 1024px) {
    .converter-cards {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.25rem;
    }
    
    .how-to-use .steps {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        padding: 0.75rem 0;
    }

    .nav {
        gap: 0.5rem;
        width: 100%;
        max-height: 300px;
        overflow-y: auto;
        padding: 0.25rem;
    }

    .nav-link {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .hero-features {
        gap: 1rem;
        flex-direction: column;
        align-items: center;
        padding: 0 1rem;
    }

    .hero-feature {
        width: 100%;
        max-width: 350px;
        justify-content: center;
        flex-wrap: wrap;
    }

    .section-title {
        font-size: 1.75rem;
        padding: 0 1rem;
    }

    .section-desc {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .converter-actions {
        flex-direction: column;
        padding: 0 1rem;
    }

    .convert-btn {
        width: 100%;
        justify-content: center;
        font-size: 1rem;
        padding: 0.875rem 2rem;
    }

    .links-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 1rem;
        padding: 0 1rem;
    }

    .link-item {
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
        justify-content: center;
    }
    
    .workflow-steps {
        padding: 0 1rem;
    }
    
    .workflow-step {
        padding: 1.5rem;
    }
    
    .faq-list {
        padding: 0 1rem;
    }
    
    .faq-question {
        padding: 1.25rem;
    }
    
    .faq-answer p {
        padding: 0 1.25rem 1.25rem;
    }
    
    .tools-grid {
        padding: 0 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .markdown-editor, .preview-content {
        min-height: 300px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .nav {
        gap: 0.25rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 0.375rem 0.5rem;
    }
    
    .converter-card {
        padding: 1.5rem;
    }
    
    .card-title {
        font-size: 1.125rem;
    }
    
    .card-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .panel-header {
        padding: 0.75rem 1rem;
    }
    
    .markdown-editor, .preview-content {
        padding: 1rem;
        min-height: 250px;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.converter-card,
.feature-item,
.support-item,
.choose-item,
.faq-item {
    animation: fadeIn 0.5s ease-out;
}

.converter-card:nth-child(1) { animation-delay: 0.1s; }
.converter-card:nth-child(2) { animation-delay: 0.2s; }
.converter-card:nth-child(3) { animation-delay: 0.3s; }
.converter-card:nth-child(4) { animation-delay: 0.4s; }
.converter-card:nth-child(5) { animation-delay: 0.5s; }
.converter-card:nth-child(6) { animation-delay: 0.6s; }