/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #fafbfc;
    --bg-card: #ffffff;
    --bg-hover: #f0f4ff;
    --text: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-muted: #8e8ea0;
    --border: #e8ecf2;
    --primary: #4f46e5;
    --primary-light: #eef2ff;
    --primary-glow: rgba(79,70,229,0.15);
    --gradient: linear-gradient(135deg, #4f46e5, #7c3aed, #db2777);
    --green: #059669;
    --green-bg: #ecfdf5;
    --yellow: #d97706;
    --yellow-bg: #fffbeb;
    --red: #dc2626;
    --red-bg: #fef2f2;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
    --radius: 12px;
    --radius-sm: 8px;
    --max-width: 1200px;
    --transition: 0.2s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; }

/* ===== Header ===== */
.site-header {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
    padding: 12px 0;
}
.site-header .container {
    display: flex; align-items: center; justify-content: space-between;
}
.logo {
    display: flex; align-items: center; gap: 8px;
    font-size: 1.25rem; font-weight: 700; color: var(--text);
}
.logo-icon { font-size: 1.5rem; }
.logo-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.main-nav { display: flex; gap: 6px; }
.nav-link {
    padding: 8px 14px; border-radius: var(--radius-sm);
    color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
    transition: var(--transition);
}
.nav-link:hover { background: var(--bg-hover); color: var(--primary); }
.nav-link.active { background: var(--primary-light); color: var(--primary); }
.mobile-menu-btn {
    display: none; background: none; border: none; font-size: 1.5rem;
    cursor: pointer; color: var(--text);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    background: none; border: 1px solid var(--border);
    border-radius: 50%; width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 1.1rem;
    transition: var(--transition); margin-left: 10px;
    color: var(--text-secondary);
}
.theme-toggle:hover { background: var(--bg-hover); color: var(--primary); }
[data-theme="dark"] .site-header { background: rgba(15,17,23,0.85); }

/* ===== Hero ===== */
.hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(180deg, var(--primary-light) 0%, transparent 100%);
}
.hero h1 {
    font-size: 2.8rem; font-weight: 800; line-height: 1.2; margin-bottom: 12px;
}
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-subtitle { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 32px; line-height: 1.8; }

.search-box {
    max-width: 560px; margin: 0 auto 32px;
    display: flex; align-items: center;
    background: var(--bg-card); border: 2px solid var(--border);
    border-radius: 50px; padding: 4px 4px 4px 20px;
    transition: var(--transition);
    box-shadow: var(--shadow);
}
.search-box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-glow); }
.search-icon { font-size: 1.2rem; flex-shrink: 0; }
.search-box input {
    flex: 1; border: none; outline: none; padding: 12px;
    font-size: 1rem; background: transparent; color: var(--text);
}
.search-box input::placeholder { color: var(--text-muted); }
.search-clear {
    background: var(--border); border: none; width: 32px; height: 32px;
    border-radius: 50%; cursor: pointer; font-size: 0.8rem; color: var(--text-secondary);
    transition: var(--transition); flex-shrink: 0;
}
.search-clear:hover { background: #ddd; }

.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-number { display: block; font-size: 2rem; font-weight: 800; color: var(--primary); }
.stat-label { color: var(--text-muted); font-size: 0.9rem; }

/* ===== Category Tabs ===== */
.categories-section { padding: 10px 0; }
.category-tabs {
    display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
}
.cat-tab {
    padding: 8px 18px; border-radius: 50px; border: 1.5px solid var(--border);
    background: var(--bg-card); color: var(--text-secondary);
    font-size: 0.9rem; cursor: pointer; transition: var(--transition);
    white-space: nowrap;
}
.cat-tab:hover { border-color: var(--primary); color: var(--primary); }
.cat-tab.active {
    background: var(--primary); color: #fff; border-color: var(--primary);
    box-shadow: 0 2px 8px var(--primary-glow);
}

/* ===== Tools Section ===== */
.tools-section { padding: 20px 0 60px; }
.tools-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.tools-header h2 { font-size: 1.5rem; font-weight: 700; }
.tools-sort { display: flex; align-items: center; gap: 8px; color: var(--text-secondary); font-size: 0.9rem; }
.tools-sort select {
    padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--bg-card); color: var(--text); font-size: 0.9rem; cursor: pointer;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
}

.tool-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    cursor: pointer; transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative; overflow: hidden;
}
.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}
.tool-card-header {
    display: flex; align-items: flex-start; gap: 14px; margin-bottom: 12px;
}
.tool-card-icon {
    width: 48px; height: 48px; border-radius: var(--radius-sm);
    background: var(--gradient); display: flex; align-items: center;
    justify-content: center; font-size: 1.5rem; flex-shrink: 0; color: #fff;
}
.tool-card-icon.alt { background: linear-gradient(135deg, #059669, #10b981); }
.tool-card-info { flex: 1; min-width: 0; }
.tool-card-name { font-size: 1.1rem; font-weight: 700; }
.tool-card-tagline { font-size: 0.85rem; color: var(--text-secondary); margin-top: 2px; }
.tool-card-meta { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.tool-card-rating {
    display: flex; align-items: center; gap: 4px;
    font-size: 0.85rem; color: var(--yellow); font-weight: 600;
}
.badge {
    display: inline-block; padding: 2px 8px; border-radius: 50px;
    font-size: 0.75rem; font-weight: 600;
}
.badge-free { background: var(--green-bg); color: var(--green); }
.badge-freemium { background: var(--yellow-bg); color: var(--yellow); }
.badge-paid { background: var(--red-bg); color: var(--red); }
.badge-addon { background: #f3e8ff; color: #7c3aed; }
.tool-card-features {
    display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px;
}
.feature-tag {
    padding: 3px 10px; background: var(--bg); border: 1px solid var(--border);
    border-radius: 50px; font-size: 0.78rem; color: var(--text-secondary);
}
.tool-card-footer {
    margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.85rem;
}
.tool-card-price { color: var(--text-secondary); }
.tool-card-github {
    display: flex; align-items: center; gap: 4px;
    color: var(--text-muted); font-size: 0.8rem;
}

/* ===== No Results ===== */
.no-results { text-align: center; padding: 60px 20px; color: var(--text-secondary); }
.no-results p { font-size: 1.1rem; }
.no-results .hint { font-size: 0.9rem; color: var(--text-muted); margin-top: 8px; }

/* ===== Featured Compares ===== */
.featured-compares { padding: 40px 0 60px; background: var(--bg); }
.featured-compares h2 { text-align: center; font-size: 1.5rem; margin-bottom: 24px; }
.compares-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.compare-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    cursor: pointer; transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.compare-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.compare-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.compare-card p { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 12px; }
.compare-card .winner {
    display: inline-block; padding: 3px 10px; background: var(--green-bg);
    color: var(--green); border-radius: 50px; font-size: 0.8rem; font-weight: 600;
}

/* ===== CTA ===== */
.cta-section { padding: 50px 0 60px; text-align: center; background: linear-gradient(180deg, transparent 0%, var(--primary-light) 100%); }
.cta-section h2 { font-size: 1.5rem; margin-bottom: 12px; }
.cta-section > .container > p { color: var(--text-secondary); margin-bottom: 20px; line-height: 1.8; }
.cta-points { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; }
.cta-point { font-size: 0.95rem; color: var(--text); font-weight: 500; }

/* ===== Tool Detail Page ===== */
.page { display: none; }
.page.active { display: block; }

.tool-detail { padding: 30px 0 60px; }
.back-link {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px;
    transition: var(--transition);
}
.back-link:hover { color: var(--primary); }
.tool-detail-header {
    display: flex; gap: 20px; align-items: flex-start;
    padding: 30px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow);
    margin-bottom: 24px;
}
.tool-detail-icon {
    width: 72px; height: 72px; border-radius: var(--radius);
    background: var(--gradient); display: flex; align-items: center;
    justify-content: center; font-size: 2.2rem; flex-shrink: 0; color: #fff;
}
.tool-detail-info h1 { font-size: 1.8rem; margin-bottom: 4px; }
.tool-detail-tagline { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 10px; }
.tool-detail-meta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.tool-detail-price { font-weight: 600; color: var(--primary); }
.tool-detail-description { font-size: 1rem; color: var(--text); line-height: 1.8; margin-bottom: 20px; }
.tool-detail-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 20px; border-radius: var(--radius-sm);
    font-size: 0.9rem; font-weight: 600; cursor: pointer;
    transition: var(--transition); border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.tool-detail-body { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }
.detail-section {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
}
.detail-section h3 { font-size: 1.1rem; margin-bottom: 14px; }
.detail-features { display: flex; flex-wrap: wrap; gap: 8px; }
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pros h4 { color: var(--green); margin-bottom: 8px; }
.cons h4 { color: var(--red); margin-bottom: 8px; }
.pros li, .cons li { font-size: 0.9rem; margin-bottom: 6px; color: var(--text-secondary); list-style: none; }
.pros li::before { content: "✅ "; }
.cons li::before { content: "❌ "; }

.alternatives-section { margin-top: 24px; }
.alternatives-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.alt-tool-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 14px;
    cursor: pointer; transition: var(--transition); text-align: center;
}
.alt-tool-card:hover { border-color: var(--primary); }
.alt-tool-card .name { font-weight: 600; font-size: 0.95rem; }
.alt-tool-card .tagline { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Category Page ===== */
.category-page { padding: 30px 0 60px; }
.category-page h1 { font-size: 1.8rem; margin-bottom: 6px; }
.category-desc { color: var(--text-secondary); margin-bottom: 24px; }

/* ===== Compare Page ===== */
.compare-page { padding: 30px 0 60px; }
.compare-page h1 { font-size: 1.8rem; margin-bottom: 6px; }
.compare-subtitle { color: var(--text-secondary); margin-bottom: 24px; }
.compare-verdict {
    background: var(--primary-light); border-left: 4px solid var(--primary);
    padding: 16px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 24px; font-size: 0.95rem; line-height: 1.7;
}
.compare-winner {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 12px; background: var(--green-bg); color: var(--green);
    border-radius: 50px; font-size: 0.85rem; font-weight: 600; margin-bottom: 16px;
}
.compare-table-wrap { overflow-x: auto; margin-bottom: 24px; }
.compare-table {
    width: 100%; border-collapse: collapse; font-size: 0.9rem;
    background: var(--bg-card); border-radius: var(--radius);
    overflow: hidden; box-shadow: var(--shadow-sm);
}
.compare-table th {
    background: var(--primary); color: #fff; padding: 12px 16px;
    text-align: left; font-weight: 600;
}
.compare-table th:first-child { border-radius: var(--radius) 0 0 0; }
.compare-table th:last-child { border-radius: 0 var(--radius) 0 0; }
.compare-table td { padding: 10px 16px; border-bottom: 1px solid var(--border); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: var(--bg-hover); }
.compare-table .winner-col { font-weight: 600; color: var(--green); }

.compare-pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.compare-use-cases { margin-top: 24px; }
.use-case-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 14px 18px;
    margin-bottom: 10px;
}
.use-case-card .scenario { font-weight: 600; display: flex; align-items: center; gap: 8px; }
.use-case-card .reason { font-size: 0.88rem; color: var(--text-secondary); margin-top: 4px; }
.use-case-card .rec { color: var(--primary); font-weight: 600; font-size: 0.85rem; }

/* ===== Compares List ===== */
.compares-list-page { padding: 30px 0 60px; }
.compares-list-page h1 { font-size: 1.8rem; margin-bottom: 20px; }
.compares-list-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }


/* ===== Pagination ===== */
.pagination {
    display: flex; align-items: center; justify-content: center;
    gap: 6px; margin-top: 32px; padding: 16px 0;
    flex-wrap: wrap;
}
.pg-info {
    font-size: 0.85rem; color: var(--text-muted);
    margin-right: 12px;
}
.pg-btn {
    min-width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--bg-card); color: var(--text-secondary);
    font-size: 0.9rem; cursor: pointer;
    transition: var(--transition);
}
.pg-btn:hover:not(:disabled):not(.active) {
    background: var(--bg-hover); color: var(--primary); border-color: var(--primary);
}
.pg-btn.active {
    background: var(--primary); color: #fff; border-color: var(--primary);
    font-weight: 600;
}
.pg-btn:disabled { opacity: 0.4; cursor: default; }



/* ===== Related Comparisons ===== */
.related-comps { display: flex; flex-direction: column; gap: 8px; }
.related-comp-link {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 14px; background: var(--bg-hover);
    border-radius: var(--radius-sm); text-decoration: none;
    color: var(--text-secondary); font-size: 0.9rem;
    transition: var(--transition);
}
.related-comp-link:hover { background: var(--primary-light); color: var(--primary); }
.vs-icon { font-size: 0.8rem; }
.winner-tag { margin-left: auto; font-size: 0.8rem; color: var(--text-muted); }

/* ===== Tips ===== */
.tips-list { display: flex; flex-direction: column; gap: 10px; }
.tip-item {
    display: flex; align-items: flex-start; gap: 12px;
    padding: 10px 14px; background: var(--primary-light);
    border-radius: var(--radius-sm); font-size: 0.9rem;
    line-height: 1.6; color: var(--text-secondary);
    transition: var(--transition);
}
.tip-item:hover { background: var(--bg-hover); }
.tip-num {
    flex-shrink: 0; width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    background: var(--primary); color: #fff;
    border-radius: 50%; font-size: 0.75rem; font-weight: 700;
}
.tip-text { padding-top: 2px; }

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--border); padding: 30px 0;
    color: var(--text-muted); font-size: 0.85rem;
}
.footer-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-brand { display: flex; align-items: center; gap: 8px; }
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--primary); }
.footer-disclaimer { margin-top: 12px; font-size: 0.78rem; text-align: center; }

/* ===== Scroll to Top ===== */
.scroll-top {
    position: fixed; bottom: 24px; right: 24px;
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--primary); color: #fff; border: none;
    font-size: 1.2rem; cursor: pointer; opacity: 0;
    transform: translateY(20px); transition: var(--transition);
    box-shadow: var(--shadow-lg); z-index: 50;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .tools-grid, .compares-grid, .compares-list-grid { grid-template-columns: 1fr; }
    .tool-detail-body { grid-template-columns: 1fr; }
    .tool-detail-header { flex-direction: column; align-items: center; text-align: center; }
    .compare-pros-cons { grid-template-columns: 1fr; }
    .pros-cons { grid-template-columns: 1fr; }
    .main-nav { display: none; }
    .mobile-menu-btn { display: block; }
    .main-nav.open {
        display: flex; flex-direction: column;
        position: absolute; top: 100%; left: 0; right: 0;
        background: var(--bg-card); border-bottom: 1px solid var(--border);
        padding: 12px 20px; gap: 4px;
        box-shadow: var(--shadow-lg);
    }
    .hero-stats { gap: 20px; }
    .stat-number { font-size: 1.5rem; }
    .footer-content { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.6rem; }
    .category-tabs { gap: 4px; }
    .cat-tab { padding: 6px 12px; font-size: 0.8rem; }
    .tool-card-header { flex-direction: column; align-items: center; text-align: center; }
    .tool-card-meta { justify-content: center; }
    .compare-table-wrap { font-size: 0.78rem; }
    .compare-table th, .compare-table td { padding: 8px 10px; }
}