/* ===== 全局重置与变量 ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #8b5cf6;
    --bg-dark: #0b0e1a;
    --bg-card: #13172b;
    --bg-card-hover: #1c2140;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #1e293b;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    background: transparent;
    color: var(--text-primary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--primary-light);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
}

/* ===== 头部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(11, 14, 26, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(11, 14, 26, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    -webkit-text-fill-color: var(--primary-light);
    font-size: 1.6rem;
}

.nav ul {
    display: flex;
    gap: 8px;
}

.nav a {
    padding: 8px 16px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav a:hover,
.nav a.active {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.15);
}

.nav a.active {
    color: var(--primary-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-toggle,
.menu-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.search-toggle:hover,
.menu-toggle:hover {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
}

.menu-toggle {
    display: none;
}

/* ===== 搜索栏 ===== */
.search-bar {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    background: rgba(11, 14, 26, 0.98);
    border-bottom: 1px solid var(--border-color);
}

.search-bar.open {
    max-height: 80px;
    opacity: 1;
}

.search-bar-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
}

.search-bar-inner input {
    flex: 1;
    padding: 12px 18px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-bar-inner input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.search-bar-inner button {
    padding: 10px 20px;
    border-radius: 50px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-bar-inner button:hover {
    transform: scale(1.02);
}

.search-close {
    background: transparent !important;
    color: var(--text-secondary) !important;
    padding: 10px !important;
    font-size: 1.2rem;
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 20px 60px;
    overflow: hidden;
    background: linear-gradient(135deg, #0b0e1a 0%, #111827 50%, #0f172a 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.hero-stats strong {
    color: var(--text-primary);
    font-size: 1.2rem;
    display: block;
}

.hero-bg-shapes .shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    z-index: 0;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary);
    top: -100px;
    left: -100px;
}

.shape-2 {
    width: 350px;
    height: 350px;
    background: var(--secondary);
    bottom: -80px;
    right: -80px;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--accent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ===== 通用 section ===== */
.section {
    padding: 80px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 36px;
}

.section-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header h2 i {
    color: var(--primary-light);
}

.more-link {
    color: var(--primary-light);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.more-link:hover {
    color: var(--secondary);
    gap: 10px;
}

/* ===== 分类网格 ===== */
.category-grid,
.category-full-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px 12px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-light);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.15);
    background: var(--bg-card-hover);
}

.category-card .cat-icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
}

.category-card .cat-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.category-card .cat-count {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== 筛选标签 ===== */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 工具卡片网格 ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary-light);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.12);
    background: var(--bg-card-hover);
}

.tool-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 14px;
}

.tool-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tool-icon.bg-blue { background: rgba(99, 102, 241, 0.2); color: #818cf8; }
.tool-icon.bg-green { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.tool-icon.bg-purple { background: rgba(139, 92, 246, 0.2); color: #a78bfa; }
.tool-icon.bg-orange { background: rgba(251, 146, 60, 0.2); color: #fb923c; }
.tool-icon.bg-pink { background: rgba(236, 72, 153, 0.2); color: #f472b6; }
.tool-icon.bg-teal { background: rgba(6, 182, 212, 0.2); color: #22d3ee; }

.tool-info {
    flex: 1;
    min-width: 0;
}

.tool-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tool-category {
    font-size: 0.75rem;
    color: var(--primary-light);
    background: rgba(99, 102, 241, 0.15);
    padding: 2px 10px;
    border-radius: 50px;
    display: inline-block;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tool-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: auto;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tool-tag {
    font-size: 0.7rem;
    color: var(--text-muted);
    background: rgba(100, 116, 139, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
}

.tool-link {
    padding: 8px 18px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    white-space: nowrap;
}

.tool-link:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}

/* ===== 加载更多 ===== */
.load-more {
    text-align: center;
    margin-top: 40px;
}

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(6, 182, 212, 0.08));
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.cta-content h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.cta-content p {
    color: var(--text-secondary);
    margin-bottom: 28px;
}

/* ===== 页面横幅 ===== */
.page-banner {
    padding: 120px 20px 60px;
    text-align: center;
    background: linear-gradient(135deg, #0b0e1a, #111827);
    border-bottom: 1px solid var(--border-color);
}

.page-banner h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.page-banner p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.banner-hot {
    background: linear-gradient(135deg, #1a0b0e, #271111);
}

.banner-about {
    background: linear-gradient(135deg, #0b1a1a, #111827);
}

/* ===== 分类页面 ===== */
.category-full-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}

.category-select {
    padding: 10px 20px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    cursor: pointer;
}

.category-select:focus {
    border-color: var(--primary-light);
}

/* ===== 热门排行列表 ===== */
.hot-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hot-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px 24px;
    transition: var(--transition);
}

.hot-item:hover {
    border-color: var(--primary-light);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.hot-rank {
    font-size: 1.6rem;
    font-weight: 800;
    width: 40px;
    text-align: center;
    color: var(--text-muted);
}

.hot-rank.top-1 { color: #f59e0b; }
.hot-rank.top-2 { color: #94a3b8; }
.hot-rank.top-3 { color: #d97706; }

.hot-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.hot-info {
    flex: 1;
    min-width: 0;
}

.hot-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.hot-info p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hot-stats {
    display: flex;
    align-items: center;
    gap: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.hot-stats i {
    margin-right: 4px;
    color: var(--primary-light);
}

.hot-link {
    padding: 8px 18px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.hot-link:hover {
    transform: scale(1.05);
}

/* ===== 关于页面 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.about-text h2 {
    font-size: 1.5rem;
    margin: 24px 0 12px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.contact-list i {
    color: var(--primary-light);
    width: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--primary-light);
    transform: scale(1.02);
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* ===== 页脚 ===== */
.footer {
    background: #070a14;
    border-top: 1px solid var(--border-color);
    padding-top: 60px;
    margin-top: auto;
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 40px;
    padding-bottom: 40px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-col p,
.footer-col li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 2;
}

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

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(11, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
    }

    .nav.open {
        max-height: 320px;
    }

    .nav ul {
        flex-direction: column;
        padding: 16px 20px;
        gap: 4px;
    }

    .nav a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .hero {
        min-height: 70vh;
        padding: 80px 20px 40px;
    }

    .hero-stats {
        gap: 20px;
    }

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

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

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

    .hot-item {
        flex-wrap: wrap;
        gap: 12px;
    }

    .hot-stats {
        width: 100%;
        justify-content: flex-start;
        gap: 16px;
    }

    .section {
        padding: 48px 0;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

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

    .hero-stats {
        flex-direction: column;
        gap: 8px;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr;
    }
}