/* ===== 全局重置 & 变量 ===== */
:root {
    --primary: #6366f1;
    --primary-light: #8b5cf6;
    --primary-dark: #4f46e5;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(99,102,241,0.15);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
    --bg: #0b1121;
    --bg-alt: #111827;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border: #334155;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 12px 40px rgba(99,102,241,0.25);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
    overflow-x: hidden;
}

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

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

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

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

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-subtitle {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.bg-alt {
    background: var(--bg-alt);
}

.hidden {
    display: none !important;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

[data-theme="dark"] .navbar {
    background: rgba(11,17,33,0.7);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(11,17,33,0.95);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text);
}

.logo i {
    font-size: 1.6rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: rgba(99,102,241,0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-btn {
    background: none;
    border: 1px solid var(--border);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ===== 英雄区 ===== */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-alt) 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text .badge {
    display: inline-block;
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.2);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
}

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

.hero-text p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-search {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 4px 4px 4px 20px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    max-width: 500px;
}

.hero-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}

.hero-search .search-icon {
    color: var(--text-muted);
    font-size: 1rem;
}

.hero-search input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 16px;
    font-size: 1rem;
    background: transparent;
    color: var(--text);
}

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

.hero-search button {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border: none;
    padding: 10px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
}

.hero-search button:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 16px rgba(99,102,241,0.4);
}

.hero-tags {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.hero-tags span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.hero-tags a {
    padding: 4px 14px;
    border-radius: 50px;
    background: var(--bg);
    border: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.hero-tags a:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99,102,241,0.05);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.floating-shapes .shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
    animation: float 6s ease-in-out infinite;
}

.shape.s1 {
    width: 200px;
    height: 200px;
    background: var(--primary);
    top: -40px;
    right: 20px;
    animation-delay: 0s;
}

.shape.s2 {
    width: 140px;
    height: 140px;
    background: var(--accent);
    bottom: -20px;
    left: 20px;
    animation-delay: 2s;
}

.shape.s3 {
    width: 100px;
    height: 100px;
    background: var(--primary-light);
    top: 40px;
    left: -30px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

.hero-illustration {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(6,182,212,0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    color: var(--primary);
    opacity: 0.8;
}

/* ===== 分类网格 ===== */
.category-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);
    border-radius: var(--radius-sm);
    padding: 20px 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.category-card i {
    font-size: 2rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
}

.category-card span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== 筛选栏 ===== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
}

.filter-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.filter-group select {
    border: none;
    outline: none;
    background: transparent;
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    padding: 4px 0;
}

.filter-search input {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    font-size: 0.9rem;
    background: var(--bg-card);
    color: var(--text);
    outline: none;
    transition: all var(--transition);
    width: 200px;
}

.filter-search input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

/* ===== 工具卡片网格 ===== */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
    box-shadow: var(--shadow);
    cursor: pointer;
    position: relative;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.tool-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 12px;
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
}

.tool-icon.orange { background: linear-gradient(135deg, #f97316, #fb923c); }
.tool-icon.green { background: linear-gradient(135deg, #10b981, #34d399); }
.tool-icon.purple { background: linear-gradient(135deg, #a855f7, #c084fc); }
.tool-icon.red { background: linear-gradient(135deg, #ef4444, #f87171); }
.tool-icon.teal { background: linear-gradient(135deg, #14b8a6, #2dd4bf); }
.tool-icon.blue { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.tool-icon.pink { background: linear-gradient(135deg, #ec4899, #f472b6); }
.tool-icon.indigo { background: linear-gradient(135deg, #6366f1, #818cf8); }

.tool-meta {
    flex: 1;
}

.tool-meta h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.tool-meta .tool-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 50px;
    background: rgba(99,102,241,0.1);
    color: var(--primary);
    font-weight: 500;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    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;
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.tool-stats {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tool-stats i {
    margin-right: 4px;
}

.tool-stats .rating {
    color: #f59e0b;
}

.tool-link {
    padding: 6px 16px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-size: 0.8rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.tool-link:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.no-result {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.no-result i {
    font-size: 3rem;
    margin-bottom: 16px;
}

/* ===== 热门排行 ===== */
.trending-list {
    display: grid;
    gap: 12px;
    max-width: 700px;
    margin: 0 auto;
}

.trending-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    transition: all var(--transition);
    cursor: pointer;
}

.trending-item:hover {
    transform: translateX(6px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.trending-rank {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-muted);
    width: 40px;
    text-align: center;
}

.trending-rank.top1 { color: #f59e0b; }
.trending-rank.top2 { color: #94a3b8; }
.trending-rank.top3 { color: #d97706; }

.trending-item .tool-icon {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
}

.trending-info {
    flex: 1;
}

.trending-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
}

.trending-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.trending-info .rating {
    color: #f59e0b;
    font-size: 0.8rem;
}

/* ===== 关于 ===== */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.about-card i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 12px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
}

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

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.social-icons {
    display: flex;
    gap: 12px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition);
}

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

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

/* ===== 弹窗 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0,0,0,0.2);
    position: relative;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--border);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    font-size: 1rem;
    transition: all var(--transition);
    z-index: 10;
}

.modal-close:hover {
    background: var(--primary);
    color: #fff;
}

.modal-body {
    padding: 40px 32px;
}

.modal-body .tool-icon {
    width: 64px;
    height: 64px;
    font-size: 2rem;
    margin-bottom: 16px;
}

.modal-body h2 {
    font-size: 1.6rem;
    margin-bottom: 8px;
}

.modal-body .tool-tag {
    display: inline-block;
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 50px;
    background: rgba(99,102,241,0.1);
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 16px;
}

.modal-body p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal-stats {
    display: flex;
    gap: 24px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.modal-stats i { margin-right: 6px; }
.modal-stats .rating { color: #f59e0b; }

.modal-link {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-weight: 600;
    transition: all var(--transition);
}

.modal-link:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 16px rgba(99,102,241,0.4);
    color: #fff;
}

/* ===== 回到顶部 ===== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: 0 4px 16px rgba(99,102,241,0.3);
    transition: all var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

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

.scroll-top:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(99,102,241,0.5);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-text p {
        margin: 0 auto 32px;
    }
    .hero-search {
        margin: 0 auto;
    }
    .hero-tags {
        justify-content: center;
    }
    .hero-visual {
        display: none;
    }
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.05);
    }
    .nav-links.active {
        display: flex;
    }
    .hamburger {
        display: flex;
    }
    .hero-text h1 {
        font-size: 2.2rem;
    }
    .section-header h2 {
        font-size: 1.8rem;
    }
    .tool-grid {
        grid-template-columns: 1fr;
    }
    .category-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    .about-content {
        grid-template-columns: 1fr;
    }
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-search input {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.8rem;
    }
    .hero-search {
        flex-direction: column;
        background: transparent;
        border: none;
        padding: 0;
        gap: 8px;
    }
    .hero-search input {
        border: 1px solid var(--border);
        border-radius: 50px;
        padding: 12px 20px;
        width: 100%;
    }
    .hero-search button {
        width: 100%;
    }
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .social-icons {
        justify-content: center;
    }
}