/* ===== 全局重置 & 变量 ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --bg-dark: #0b0f1a;
    --bg-card: #1a1f2e;
    --bg-card-hover: #222a3a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #2d3748;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    --transition: all 0.25s ease;
}

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

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

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--primary);
}

img {
    max-width: 100%;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(11, 15, 26, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.navbar.scrolled {
    background: rgba(11, 15, 26, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}
.logo i {
    color: var(--primary);
    font-size: 1.8rem;
}
.logo span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 8px;
}
.nav-links a {
    padding: 8px 18px;
    border-radius: 30px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}
.nav-links a i {
    margin-right: 6px;
}
.nav-links a:hover,
.nav-links a.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--text-primary);
}
.nav-links a.active {
    background: var(--primary);
    color: #fff;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 6px;
}
/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}
.hero h1 {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 16px;
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 60px;
    padding: 6px 6px 6px 20px;
    max-width: 600px;
    margin: 0 auto 24px;
    transition: var(--transition);
}
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.25);
}
.search-box .search-icon {
    color: var(--text-secondary);
    font-size: 1.1rem;
}
.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 14px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}
.search-box input::placeholder {
    color: var(--text-secondary);
}
.search-box button {
    background: var(--primary);
    border: none;
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}
.search-box button:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.hero-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.hero-tags a {
    background: var(--bg-card);
    padding: 6px 16px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}
.hero-tags a:hover {
    border-color: var(--primary);
    color: var(--text-primary);
    background: rgba(99,102,241,0.1);
}

/* Hero 背景形状 */
.hero-bg-shapes {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}
.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(80px);
}
.shape1 {
    width: 400px; height: 400px;
    background: var(--primary);
    top: -100px; left: -100px;
}
.shape2 {
    width: 350px; height: 350px;
    background: var(--secondary);
    bottom: -80px; right: -80px;
}
.shape3 {
    width: 250px; height: 250px;
    background: var(--accent);
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

/* ===== 通用 section ===== */
.section {
    padding: 80px 0;
}
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 16px;
}
.section-header h2 {
    font-size: 2rem;
    font-weight: 600;
}
.btn-outline {
    padding: 10px 24px;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--text-primary);
    background: rgba(99,102,241,0.08);
}

/* ===== 分类卡片 ===== */
.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 20px;
}
.cat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    color: var(--text-primary);
}
.cat-card i {
    font-size: 2.5rem;
    color: var(--cat-color, var(--primary));
    margin-bottom: 12px;
}
.cat-card h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}
.cat-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.cat-card:hover {
    transform: translateY(-6px);
    border-color: var(--cat-color, var(--primary));
    box-shadow: 0 12px 30px rgba(0,0,0,0.4);
}

/* ===== 工具网格 ===== */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.tool-card:hover {
    transform: translateY(-6px) scale(1.01);
    border-color: rgba(99,102,241,0.3);
    box-shadow: 0 16px 40px rgba(0,0,0,0.5);
    background: var(--bg-card-hover);
}
.tool-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 14px;
}
.tool-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(99,102,241,0.15);
    flex-shrink: 0;
}
.tool-card-header h3 {
    font-size: 1.15rem;
    font-weight: 600;
}
.tool-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex: 1;
    margin-bottom: 16px;
    line-height: 1.5;
}
.tool-tag {
    display: inline-block;
    background: rgba(99,102,241,0.12);
    color: var(--accent);
    padding: 3px 12px;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 14px;
    align-self: flex-start;
}
.tool-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}
.tool-actions .btn-primary {
    flex: 1;
    padding: 10px 16px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}
.tool-actions .btn-primary:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}
.tool-actions .btn-fav {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}
.tool-actions .btn-fav:hover {
    border-color: #f472b6;
    color: #f472b6;
    background: rgba(244,114,182,0.1);
}
.tool-actions .btn-fav.favorited {
    color: #f472b6;
    background: rgba(244,114,182,0.15);
    border-color: #f472b6;
}

/* ===== 数据统计 ===== */
.stats-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);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    text-align: center;
}
.stat-item i {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 8px;
}
.stat-number {
    font-size: 2.6rem;
    font-weight: 700;
    display: block;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-item p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===== 页脚 ===== */
.footer {
    background: #0a0e18;
    border-top: 1px solid var(--border-color);
    padding: 60px 0 0;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo {
    font-size: 1.4rem;
    margin-bottom: 12px;
}
.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 8px;
}
.footer-links h4,
.footer-newsletter h4 {
    margin-bottom: 16px;
    font-size: 1.1rem;
}
.footer-links a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 8px;
    transition: var(--transition);
}
.footer-links a:hover {
    color: var(--text-primary);
    padding-left: 4px;
}
.footer-newsletter form {
    display: flex;
    gap: 8px;
}
.footer-newsletter input {
    flex: 1;
    padding: 12px 16px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    outline: none;
}
.footer-newsletter input:focus {
    border-color: var(--primary);
}
.footer-newsletter button {
    background: var(--primary);
    border: none;
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}
.footer-newsletter button:hover {
    background: var(--primary-dark);
}
.form-message {
    font-size: 0.85rem;
    margin-top: 8px;
    color: var(--text-secondary);
}
.footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== 分类页 ===== */
.page-hero {
    padding: 120px 24px 60px;
    text-align: center;
}
.page-hero h1 {
    font-size: 2.6rem;
    margin-bottom: 12px;
}
.page-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
    justify-content: center;
}
.filter-btn {
    padding: 8px 20px;
    border-radius: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    font-weight: 500;
}
.filter-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}
.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 4px 4px 4px 18px;
    max-width: 480px;
    margin: 0 auto 32px;
}
.search-bar i {
    color: var(--text-secondary);
}
.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 12px;
    color: var(--text-primary);
    outline: none;
    font-size: 0.95rem;
}
.search-bar input::placeholder {
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    display: none;
}
.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
}

/* ===== 排行榜 ===== */
.ranking-list {
    max-width: 800px;
    margin: 0 auto;
}
.ranking-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 18px 24px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}
.ranking-item:hover {
    border-color: rgba(99,102,241,0.3);
    transform: translateX(6px);
}
.rank-number {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 40px;
    text-align: center;
}
.rank-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(99,102,241,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}
.rank-info {
    flex: 1;
}
.rank-info h3 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}
.rank-info p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}
.rank-stars {
    color: #f59e0b;
    font-size: 0.9rem;
    margin-right: 8px;
}
.rank-score {
    font-weight: 600;
    color: var(--accent);
}

/* ===== 关于页 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
}
.about-text h2 {
    font-size: 1.8rem;
    margin: 24px 0 12px;
}
.about-text h2:first-of-type {
    margin-top: 0;
}
.about-text p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}
.about-text i {
    color: var(--primary);
    width: 24px;
}
.about-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
}
.stat-card i {
    font-size: 2rem;
    color: var(--primary);
}
.stat-card span {
    font-weight: 600;
    font-size: 1.1rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(11, 15, 26, 0.98);
        backdrop-filter: blur(20px);
        padding: 20px 24px;
        gap: 8px;
        transform: translateY(-120%);
        transition: transform 0.35s ease;
        border-bottom: 1px solid var(--border-color);
        z-index: 999;
    }
    .nav-links.open {
        transform: translateY(0);
    }
    .hamburger {
        display: block;
    }
    .hero {
        min-height: 70vh;
        padding: 100px 16px 60px;
    }
    .category-cards {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
    .tool-grid {
        grid-template-columns: 1fr;
    }
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-newsletter form {
        max-width: 360px;
        margin: 0 auto;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .ranking-item {
        flex-wrap: wrap;
        gap: 12px;
    }
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    .search-box {
        flex-wrap: wrap;
        padding: 4px 4px 4px 14px;
    }
    .search-box button {
        width: 42px;
        height: 42px;
    }
    .cat-card {
        padding: 20px 12px;
    }
    .tool-card {
        padding: 18px;
    }
}