/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0a0a0a; --surface: #141414; --border: #272727;
  --text: #e5e5e5; --text-muted: #a3a3a3;
  --primary: #3b82f6; --primary-hover: #2563eb;
  --success: #22c55e; --warning: #f59e0b;
  --anthropic: #cc7332; --openai: #10a37f; --google: #4285f4;
  --qwen: #6b21a8; --deepseek: #1d4ed8; --mistral: #f97316;
  --radius: 8px;
}
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

/* === Header === */
.site-header { border-bottom: 1px solid var(--border); padding: 1rem 0; position: sticky; top: 0; background: rgba(10,10,10,0.95); backdrop-filter: blur(8px); z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.25rem; font-weight: 700; color: var(--text); }
.logo:hover { text-decoration: none; }
.site-header nav { display: flex; gap: 1.5rem; }
.site-header nav a { color: var(--text-muted); font-size: 0.9rem; }
.site-header nav a:hover { color: var(--text); text-decoration: none; }

/* === Hero === */
.hero { text-align: center; padding: 4rem 0 3rem; }
.hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; line-height: 1.2; }
.hero-subtitle { font-size: 1.1rem; color: var(--text-muted); max-width: 700px; margin: 0 auto 2rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; }
.btn { padding: 0.75rem 1.5rem; border-radius: var(--radius); font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer; display: inline-block; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text-muted); }

/* === Sections === */
.section { padding: 3rem 0; border-top: 1px solid var(--border); }
.section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.5rem; }
.section-desc { color: var(--text-muted); margin-bottom: 1.5rem; }

/* === Comparison Table === */
.comparison-table-responsive { overflow-x: auto; }
.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.comparison-table th { background: var(--surface); padding: 0.75rem; text-align: left; border-bottom: 2px solid var(--border); font-weight: 600; white-space: nowrap; }
.comparison-table td { padding: 0.75rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
.comparison-table tr:hover td { background: rgba(59,130,246,0.05); }
.comparison-table .cost { font-family: 'SF Mono', 'Fira Code', monospace; font-weight: 600; color: var(--success); }
.model-name { font-weight: 600; color: var(--text); }
.model-name:hover { text-decoration: underline; }

/* === Tool Grid === */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1rem; }
.tool-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; transition: border-color 0.15s; }
.tool-card:hover { border-color: var(--primary); text-decoration: none; }
.tool-card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.5rem; }
.tool-card-header h3 { font-size: 1.1rem; font-weight: 600; color: var(--text); }
.tool-card-desc { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 0.75rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tool-card-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* === Platform Grid === */
.platform-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.platform-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.platform-card:hover { border-color: var(--primary); text-decoration: none; }
.platform-card h3 { margin-bottom: 0.5rem; }
.platform-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.platform-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* === Category Grid === */
.category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.category-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.category-card:hover { border-color: var(--primary); text-decoration: none; }
.category-card h3 { margin-bottom: 0.5rem; }
.category-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.75rem; }
.category-count { font-size: 0.85rem; color: var(--primary); font-weight: 600; }

/* === Badges === */
.provider-badge { font-size: 0.75rem; padding: 0.2rem 0.6rem; border-radius: 4px; font-weight: 600; color: white; }
.provider-badge.anthropic { background: var(--anthropic); }
.provider-badge.openai { background: var(--openai); }
.provider-badge.google { background: var(--google); }
.provider-badge.qwen { background: var(--qwen); }
.provider-badge.deepseek { background: var(--deepseek); }
.provider-badge.mistral { background: var(--mistral); }
.provider-badge.default { background: var(--text-muted); }

.price-tag { font-size: 0.8rem; padding: 0.15rem 0.5rem; background: rgba(34,197,94,0.1); color: var(--success); border-radius: 4px; font-family: 'SF Mono', monospace; }
.scenario-cost { font-size: 0.8rem; color: var(--text-muted); }

.feature-tag { display: inline-block; font-size: 0.8rem; padding: 0.2rem 0.6rem; background: rgba(59,130,246,0.1); color: var(--primary); border-radius: 4px; margin: 0.15rem; }
.category-link { display: inline-block; font-size: 0.85rem; padding: 0.3rem 0.75rem; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; margin: 0.2rem; color: var(--text); }
.category-link:hover { border-color: var(--primary); text-decoration: none; }

/* === Tool Detail === */
.breadcrumb { padding: 1rem 0; font-size: 0.85rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.tool-detail { padding: 2rem 0; }
.tool-detail-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.tool-detail-header h1 { font-size: 2rem; }
.tool-detail-desc { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 1.5rem; }
.tool-detail-meta { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-bottom: 1rem; font-size: 0.9rem; }
.tool-detail-meta span { color: var(--text-muted); }
.feature-list { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* === Tables === */
.pricing-table { width: 100%; max-width: 400px; border-collapse: collapse; }
.pricing-table th { background: var(--surface); padding: 0.6rem 1rem; text-align: left; border-bottom: 2px solid var(--border); }
.pricing-table td { padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); }

.scenario-table { width: 100%; border-collapse: collapse; }
.scenario-table th { background: var(--surface); padding: 0.6rem 1rem; text-align: left; border-bottom: 2px solid var(--border); }
.scenario-table td { padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); }

.comparison-mini-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.comparison-mini-table th { background: var(--surface); padding: 0.5rem; text-align: left; border-bottom: 2px solid var(--border); }
.comparison-mini-table td { padding: 0.5rem; border-bottom: 1px solid var(--border); }
.comparison-mini-table .highlighted { background: rgba(59,130,246,0.1); }
.compare-link { font-size: 0.8rem; color: var(--primary); }

/* === Compare Page === */
.compare-header { padding: 2rem 0; }
.compare-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 2rem 0; }
.compare-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.compare-card.winner { border-color: var(--success); }
.compare-card h2 { margin-bottom: 0.75rem; }
.mini-pricing { width: 100%; font-size: 0.85rem; margin-top: 0.75rem; }
.mini-pricing td { padding: 0.3rem 0; border-bottom: 1px solid var(--border); }
.mini-pricing tr td:last-child { text-align: right; }
.verdict { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.verdict p { margin-bottom: 0.5rem; }
.compare-results .cheaper { color: var(--success); }

/* === Calculator === */
.calculator { padding: 2rem 0; }
.calculator-controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 2rem; align-items: end; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.3rem; }
.form-group input { width: 100%; padding: 0.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); font-size: 1rem; }
.form-group input[type="range"] { padding: 0; }
.calculator-results { display: grid; gap: 0.5rem; }
.calc-result { display: grid; grid-template-columns: 40px 1fr auto auto; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; background: var(--surface); border-radius: var(--radius); border: 1px solid var(--border); }
.calc-result.cheapest { border-color: var(--success); background: rgba(34,197,94,0.05); }
.calc-result .rank { color: var(--text-muted); font-weight: 600; font-size: 0.85rem; }
.calc-result .calc-model { font-weight: 600; color: var(--text); }
.calc-result .calc-cost { font-family: 'SF Mono', monospace; font-size: 1.1rem; }

/* === FAQ === */
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 0.5rem; }
.faq summary { padding: 1rem 1.25rem; cursor: pointer; font-weight: 600; }
.faq details[open] summary { border-bottom: 1px solid var(--border); }
.faq details p { padding: 1rem 1.25rem; color: var(--text-muted); }

/* === Page Header === */
.page-header { padding: 2rem 0 1rem; }
.page-header h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.page-header p { color: var(--text-muted); }

/* === Footer === */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; margin-top: 2rem; }
.site-footer p { color: var(--text-muted); font-size: 0.85rem; }
.footer-links { margin-top: 0.5rem; }
.footer-links a { color: var(--text-muted); }

/* === External Link === */
.external-link { display: inline-block; padding: 0.5rem 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.85rem; margin-top: 0.5rem; }
.platform-detail-meta { display: flex; align-items: center; gap: 1rem; margin-top: 1rem; }

/* === Use Case Pages === */
.rank-badge { display: inline-block; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 0.2rem 0.5rem; font-size: 0.8rem; font-weight: 600; }
.rank-badge:first-child { background: rgba(34,197,94,0.15); border-color: var(--success); color: var(--success); }
.recommendation-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; margin-top: 1rem; }
.recommendation-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.recommendation-card.top-pick { border-color: var(--success); background: rgba(34,197,94,0.05); }
.recommendation-rank { font-size: 0.85rem; font-weight: 700; color: var(--primary); margin-bottom: 0.5rem; }
.recommendation-card h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.recommendation-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1rem; }
.recommendation-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; font-size: 0.8rem; }
.use-case-content { max-width: 750px; }
.use-case-content p { margin-bottom: 1rem; color: var(--text-muted); line-height: 1.7; }
.use-case-content h3 { color: var(--text); font-size: 1.2rem; margin: 1.5rem 0 0.75rem; }
.use-case-content ul { margin: 1rem 0 1rem 1.5rem; color: var(--text-muted); }
.use-case-content li { margin-bottom: 0.5rem; }

/* === Budget Planner === */
.planner { display: grid; grid-template-columns: 320px 1fr; gap: 2rem; padding: 2rem 0; }
.planner-sidebar { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; align-self: start; position: sticky; top: 5rem; }
.planner-sidebar h3 { font-size: 1.1rem; margin-bottom: 1.25rem; color: var(--text); }
.planner-input-group { margin-bottom: 1.25rem; }
.planner-input-group label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.4rem; }
.planner-input-group select { width: 100%; padding: 0.5rem; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); font-size: 0.95rem; }
.budget-display { text-align: center; margin-bottom: 0.5rem; }
.budget-amount { font-size: 2rem; font-weight: 800; color: var(--success); }
input[type="range"] { width: 100%; accent-color: var(--primary); }
.slider-labels { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; }
.share-section { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.share-section label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.4rem; }
.share-input-group { display: flex; gap: 0.5rem; }
.share-input-group input { flex: 1; padding: 0.4rem 0.6rem; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); font-size: 0.8rem; }
.share-input-group .btn { padding: 0.4rem 0.8rem; font-size: 0.8rem; white-space: nowrap; }

.planner-results { min-height: 400px; }
.planner-empty-state { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 3rem; text-align: center; color: var(--text-muted); }

.planner-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 2rem; }
.summary-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; }
.summary-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.3rem; }
.summary-value { font-size: 1.3rem; font-weight: 700; color: var(--text); }

.planner-results h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 1rem; }
.recommendations { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.recommendation-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.recommendation-card.primary { border-color: var(--success); background: rgba(34,197,94,0.03); }
.rec-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--primary); font-weight: 700; margin-bottom: 0.5rem; }
.rec-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.rec-header h3 { margin: 0; font-size: 1.1rem; }
.rec-header h3 a { color: var(--text); }
.rec-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 1rem; margin-bottom: 0.75rem; }
.rec-stat { display: flex; flex-direction: column; }
.stat-label { font-size: 0.75rem; color: var(--text-muted); }
.stat-value { font-size: 0.95rem; font-weight: 600; color: var(--text); }
.rec-best-for { font-size: 0.8rem; color: var(--text-muted); font-style: italic; }

.planner-table-wrapper { overflow-x: auto; }
.planner-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.planner-table th { background: var(--surface); padding: 0.6rem 0.75rem; text-align: left; border-bottom: 2px solid var(--border); font-weight: 600; white-space: nowrap; }
.planner-table td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
.planner-table tr:hover td { background: rgba(59,130,246,0.03); }
.planner-table td.cost { font-family: 'SF Mono', monospace; font-weight: 600; color: var(--success); }
.planner-table td.unused { color: var(--text-muted); font-size: 0.8rem; }
.planner-table tr.exceeds td { color: var(--text-muted); opacity: 0.6; }
.planner-table .provider-badge { font-size: 0.65rem; padding: 0.15rem 0.4rem; border-radius: 3px; font-weight: 600; color: white; display: inline-block; margin-left: 0.3rem; }

/* === Cost Report Highlights === */
.scenario-highlights { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-top: 1rem; }
.scenario-highlight { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.scenario-highlight h3 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--primary); }
.scenario-highlight-content div { margin-bottom: 0.3rem; font-size: 0.9rem; color: var(--text-muted); }
.scenario-highlight-content .cost { color: var(--success); font-weight: 600; font-family: 'SF Mono', monospace; }

/* === Responsive === */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; }
  .compare-cards { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .site-header nav { gap: 0.75rem; font-size: 0.8rem; }
  .calc-result { grid-template-columns: 30px 1fr auto; }
  .calc-result .provider-badge { display: none; }
}