/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 */
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* 中性色 */
    --bg-primary: #190a19;
    --bg-secondary: #1f1a1a2e;
    --bg-card: #1f16213e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #8b8ba7;
    
    /* 边框和阴影 */
    --border-color: #2a2a4a;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.2);
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 字体大小 */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 2rem;
    --font-4xl: 2.5rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 动态背景 */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--bg-primary);
    overflow: hidden;
}

/* 粒子容器 */
.particles-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2; /* 设置为负值，确保在所有内容之下 */
    pointer-events: none; /* 不拦截鼠标事件 */
    overflow: hidden;
}

/* 粒子元素 */
.particles-container .particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform;
}

/* 连接线 */
.particles-container .connection-line {
    position: absolute;
    pointer-events: none;
    will-change: transform;
}

/* 调整浮动形状的层级，使其在粒子之上 */
.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1; /* 在粒子之上，但仍在内容之下 */
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.08;
    animation: float 25s infinite linear;
    filter: blur(1px);
}

.shape-1 {
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    top: 15%;
    left: 8%;
    animation-delay: 0s;
}

.shape-2 {
    width: 180px;
    height: 180px;
    background: var(--gradient-secondary);
    top: 55%;
    right: 12%;
    animation-delay: -8s;
}

.shape-3 {
    width: 90px;
    height: 90px;
    background: var(--gradient-accent);
    top: 75%;
    left: 65%;
    animation-delay: -15s;
}

.shape-4 {
    width: 150px;
    height: 150px;
    background: var(--gradient-primary);
    top: 25%;
    right: 25%;
    animation-delay: -20s;
}

.shape-5 {
    width: 200px;
    height: 200px;
    background: var(--gradient-secondary);
    top: 5%;
    right: 55%;
    animation-delay: -12s;
}

/* 科技感粒子效果 */
.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    animation: techParticleFloat 20s infinite linear;
    filter: blur(0.5px);
}

/* 主要粒子 - 发光效果 */
.particle.primary {
    width: 3px;
    height: 3px;
    background: #667eea;
    box-shadow:
        0 0 6px #667eea,
        0 0 12px #667eea,
        0 0 18px rgba(102, 126, 234, 0.4);
    animation-duration: 25s;
}

/* 次要粒子 - 紫色发光 */
.particle.secondary {
    width: 2px;
    height: 2px;
    background: #764ba2;
    box-shadow:
        0 0 4px #764ba2,
        0 0 8px #764ba2,
        0 0 12px rgba(118, 75, 162, 0.4);
    animation-duration: 30s;
}

/* 小粒子 - 蓝色发光 */
.particle.accent {
    width: 1.5px;
    height: 1.5px;
    background: #4facfe;
    box-shadow:
        0 0 3px #4facfe,
        0 0 6px #4facfe,
        0 0 9px rgba(79, 172, 254, 0.4);
    animation-duration: 22s;
}

/* 连接线 */
.particle-line {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg,
        transparent,
        rgba(102, 126, 234, 0.3),
        transparent);
    animation: lineFloat 15s infinite linear;
    filter: blur(0.5px);
}

/* 网格效果 */
.tech-grid {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 60s infinite linear;
}

/* 脉冲圆环 */
.pulse-ring {
    position: absolute;
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 50%;
    animation: pulseRing 4s infinite ease-out;
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(0deg) scale(1);
    }
    25% {
        transform: translateY(-40px) rotate(90deg) scale(1.1);
    }
    50% {
        transform: translateY(20px) rotate(180deg) scale(0.9);
    }
    75% {
        transform: translateY(-20px) rotate(270deg) scale(1.05);
    }
    100% {
        transform: translateY(0px) rotate(360deg) scale(1);
    }
}

/* 科技感动画效果 */
@keyframes techParticleFloat {
    0% {
        transform: translateY(100vh) translateX(0px) rotate(0deg);
        opacity: 0;
    }
    5% {
        opacity: 1;
    }
    95% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) translateX(200px) rotate(360deg);
        opacity: 0;
    }
}

@keyframes lineFloat {
    0% {
        transform: translateX(-100px) translateY(100vh);
        opacity: 0;
        width: 0px;
    }
    20% {
        opacity: 0.6;
        width: 100px;
    }
    80% {
        opacity: 0.6;
        width: 150px;
    }
    100% {
        transform: translateX(100px) translateY(-100px);
        opacity: 0;
        width: 0px;
    }
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

@keyframes pulseRing {
    0% {
        transform: scale(0.1);
        opacity: 1;
    }
    80% {
        transform: scale(1.2);
        opacity: 0.3;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

/* 发光脉冲效果 */
@keyframes glowPulse {
    0%, 100% {
        box-shadow:
            0 0 5px currentColor,
            0 0 10px currentColor,
            0 0 15px currentColor;
    }
    50% {
        box-shadow:
            0 0 10px currentColor,
            0 0 20px currentColor,
            0 0 30px currentColor;
    }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-medium);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-logo i {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--font-2xl);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.1);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* 主要内容 */
.main-content {
    padding-top: 70px;
}

/* 英雄区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 12px;
    font-size: var(--font-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-medium);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

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

/* 搜索区域 */
.search-section {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.search-content {
    text-align: center;
}

.search-title {
    font-size: var(--font-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-subtitle {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-box {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.search-box i.fa-search {
      position: absolute;
      left: var(--spacing-md);
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      font-size: var(--font-lg);
      z-index: 2;
    }

.search-box input {
    width: 100%;
    padding: var(--spacing-md) 4rem var(--spacing-md) 3rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    color: var(--text-primary);
    font-size: var(--font-base);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-light);
}

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

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn i {
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}


.search-btn:hover {
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--shadow-medium);
}

.search-suggestions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.suggestion-label {
    font-size: var(--font-sm);
    color: var(--text-muted);
    margin-right: var(--spacing-xs);
}

.suggestion-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: var(--font-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.suggestion-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

/* 工具展示区域 */
.tools-section {
    padding: var(--spacing-xl) var(--spacing-md);
    min-height: 50vh;
}

.tools-container {
    max-width: 1200px;
    margin: 0 auto;
}

.tools-category {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.category-title i {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* 工具卡片 */
.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-lg);
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

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

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

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

.tool-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-xl);
    color: white;
    flex-shrink: 0;
}

.tool-icon.online {
    background: var(--gradient-primary);
}

.tool-icon.download {
    background: var(--gradient-secondary);
}

.tool-info h3 {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.tool-type {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    font-size: var(--font-xs);
    font-weight: 500;
    border-radius: 6px;
}

.tool-description {
    color: var(--text-secondary);
    font-size: var(--font-sm);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

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

.tool-btn {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: 8px;
    font-size: var(--font-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

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

.tool-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

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

.tool-btn.secondary:hover {
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* 开发中状态样式 */
.tool-card.developing {
    opacity: 0.8;
    position: relative;
}

.tool-card.developing::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    pointer-events: none;
    border-radius: 16px;
}

.tool-card.developing:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.status-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: var(--font-xs);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    z-index: 2;
}

.status-badge.developing {
    background: linear-gradient(135deg, #ff9a56, #ff6b6b);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.tool-btn.disabled {
    background: var(--bg-secondary) !important;
    color: var(--text-muted) !important;
    cursor: not-allowed !important;
    opacity: 0.6;
}

.tool-btn.disabled:hover {
    transform: none !important;
    box-shadow: none !important;
}

.size-developing {
    color: var(--text-muted);
    font-style: italic;
}

.tool-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-xs);
    color: var(--text-muted);
}

/* 页脚 */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.footer-section h3 {
    font-size: var(--font-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section p {
    color: var(--text-secondary);
    font-size: var(--font-sm);
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-sm);
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-sm);
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

.beian-info {
    margin-top: var(--spacing-xs);
}

.beian-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--font-xs);
    transition: var(--transition-fast);
    opacity: 0.8;
}

.beian-link:hover {
    color: var(--primary-color);
    opacity: 1;
    text-decoration: underline;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: var(--font-lg);
    cursor: pointer;
    transition: var(--transition-medium);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* 加载动画 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: var(--font-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(15, 15, 35, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-xl);
        transition: var(--transition-medium);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }

    .search-container {
        padding: 0 var(--spacing-sm);
    }

    .filter-tabs {
        width: 100%;
        justify-content: stretch;
    }

    .filter-tab {
        flex: 1;
        justify-content: center;
        min-width: 0;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }

    .nav-container {
        padding: 0 var(--spacing-sm);
    }

    .hero-section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .search-section,
    .tools-section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

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

    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
}

/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.modal-content {
    background: var(--bg-card);
    border-radius: 20px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-large);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--gradient-primary);
    color: white;
    border-radius: 20px 20px 0 0;
}

.modal-header h2 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-xl);
}

.modal-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* 关于页面样式 */
.about-section {
    margin-bottom: var(--spacing-xl);
}

.about-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-lg);
}

.about-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

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

.feature-item i {
    font-size: var(--font-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-base);
}

.feature-item p {
    color: var(--text-muted);
    font-size: var(--font-sm);
    margin: 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 12px;
    color: white;
}

.stat-number {
    font-size: var(--font-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-sm);
    opacity: 0.9;
}

/* 了解更多页面样式 */
.intro-section {
    margin-bottom: var(--spacing-xl);
}

.intro-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-lg);
}

.intro-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: var(--font-base);
}

.tools-showcase {
    margin-bottom: var(--spacing-xl);
}

.tools-showcase h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-lg);
}

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

.showcase-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

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

.showcase-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-xl);
}

.showcase-content h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-base);
}

.showcase-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    font-size: var(--font-sm);
}

.cta-section {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.cta-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-lg);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-base);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: var(--font-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* 模态框响应式样式 */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        max-height: 95vh;
        border-radius: 16px;
    }

    .modal-header {
        padding: var(--spacing-md);
        border-radius: 16px 16px 0 0;
    }

    .modal-header h2 {
        font-size: var(--font-lg);
    }

    .modal-body {
        padding: var(--spacing-md);
    }

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

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

    .showcase-item {
        flex-direction: column;
        text-align: center;
    }

    .showcase-icon {
        align-self: center;
    }

    .cta-section {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 98%;
        max-height: 98vh;
        border-radius: 12px;
    }

    .modal-header {
        padding: var(--spacing-sm);
        border-radius: 12px 12px 0 0;
    }

    .modal-body {
        padding: var(--spacing-sm);
    }

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

    .showcase-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-lg);
    }
}