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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ===== 导航栏 ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background-color: var(--surface-hover);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== Hero 区域 ===== */
.hero {
    background: var(--gradient-primary);
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-search {
    display: flex;
    gap: 0.5rem;
    max-width: 500px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease 0.4s both;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 0.5rem;
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--background-color);
    font-size: 1rem;
}

.search-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.search-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--background-color);
    color: var(--text-primary);
    border: none;
    border-radius: 0.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background-color: var(--surface-color);
}

/* ===== 分类区域 ===== */
.categories {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.categories h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

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

.category-card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: block;
    color: var(--text-primary);
}

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

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.tool-count {
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== 工具展示区域 ===== */
.featured-tools,
.all-tools {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.featured-tools h2,
.all-tools h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

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

.tool-card {
    background-color: var(--surface-color);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.tool-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.tool-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--gradient-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: bold;
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.tool-header h3 {
    font-size: 1.25rem;
    margin: 0;
}

.tool-rating {
    color: var(--warning-color);
    font-size: 0.875rem;
}

.tool-desc {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background-color: var(--surface-hover);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
}

.tool-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.tool-price {
    font-weight: bold;
    color: var(--success-color);
}

.tool-btn {
    background: var(--gradient-primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tool-btn:hover {
    transform: translateX(5px);
    color: white;
}

/* ===== 为什么选择我们 ===== */
.why-choose {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    text-align: center;
}

.why-choose h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

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

.feature-card {
    padding: 2rem;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* ===== 页脚 ===== */
footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section p,
.footer-section a {
    color: var(--text-secondary);
    line-height: 1.8;
}

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

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

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

/* ===== 分类页面样式 ===== */
.category-hero {
    background: var(--gradient-primary);
    padding: 4rem 2rem;
    text-align: center;
}

.category-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.category-hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--surface-color);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links.active {
        display: flex;
    }

    .hero {
        padding: 4rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .hero-search {
        flex-direction: column;
    }

    .categories,
    .featured-tools,
    .all-tools,
    .why-choose {
        padding: 0 1rem;
    }

    .tool-footer {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .tool-btn {
        width: 100%;
        text-align: center;
        display: block;
    }
}