/* ===== Variables ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --color-success: #16a34a;
  --color-error: #dc2626;
  --max-width: 1200px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --transition: 0.15s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--color-text); background: var(--color-bg); line-height: 1.6; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; }
button { cursor: pointer; font-family: inherit; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.page-wrapper { min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
.nav { background: var(--color-bg); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
.nav-inner { display: flex; align-items: center; height: 60px; gap: 32px; }
.nav-logo { font-weight: 700; font-size: 1.25rem; color: var(--color-text); }
.nav-logo:hover { color: var(--color-text); }
.nav-links { display: flex; gap: 24px; flex: 1; }
.nav-links a { color: var(--color-text-muted); font-size: 0.9375rem; transition: color var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-lang { margin-left: auto; padding: 6px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-size: 0.875rem; color: var(--color-text-muted); transition: all var(--transition); }
.nav-lang:hover { border-color: var(--color-primary); color: var(--color-primary); }
.hero { padding: 64px 0 48px; text-align: center; }
.hero-title { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.hero-subtitle { font-size: 1.125rem; color: var(--color-text-muted); max-width: 600px; margin: 0 auto 32px; }
.hero-search { display: flex; max-width: 480px; margin: 0 auto; border: 2px solid var(--color-border); border-radius: 28px; overflow: hidden; background: var(--color-bg); transition: border-color var(--transition); }
.hero-search:focus-within { border-color: var(--color-primary); }
.hero-search input { flex: 1; border: none; outline: none; padding: 12px 20px; font-size: 1rem; background: transparent; }
.hero-search button { padding: 12px 24px; background: var(--color-primary); color: white; border: none; font-size: 0.9375rem; font-weight: 500; transition: background var(--transition); }
.hero-search button:hover { background: var(--color-primary-dark); }
.section { padding: 48px 0; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.section-title { font-size: 1.5rem; font-weight: 700; }
.section-link { font-size: 0.9375rem; color: var(--color-primary); }
.section + .section { border-top: 1px solid var(--color-border); }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.card { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; transition: box-shadow var(--transition), transform var(--transition); }
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-title { font-size: 1.125rem; font-weight: 600; margin-bottom: 8px; }
.card-desc { font-size: 0.9375rem; color: var(--color-text-muted); margin-bottom: 16px; }
.card-link { display: inline-flex; align-items: center; gap: 4px; font-size: 0.875rem; font-weight: 500; }
.btn { padding: 8px 16px; border-radius: var(--radius-sm); font-size: 0.875rem; font-weight: 500; border: 1px solid transparent; transition: all var(--transition); }
.btn-primary { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); }
.btn-secondary { background: white; color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-danger { background: white; color: var(--color-error); border-color: var(--color-border); }
.btn-danger:hover { border-color: var(--color-error); }
.tool-page { padding: 32px 0; }
.tool-layout { display: grid; grid-template-columns: 1fr 300px; gap: 32px; align-items: start; }
.tool-header { margin-bottom: 24px; }
.tool-title { font-size: 1.875rem; font-weight: 800; margin-bottom: 8px; }
.tool-desc { font-size: 1rem; color: var(--color-text-muted); margin-bottom: 12px; }
.tool-privacy { display: inline-flex; align-items: center; gap: 6px; font-size: 0.8125rem; color: var(--color-success); background: #f0fdf4; padding: 4px 10px; border-radius: 20px; }
.tool-body { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; }
.tool-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
textarea.tool-input { width: 100%; min-height: 200px; padding: 12px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-family: 'Monaco', 'Courier New', monospace; font-size: 0.875rem; resize: vertical; outline: none; transition: border-color var(--transition); }
textarea.tool-input:focus { border-color: var(--color-primary); }
.tool-error { color: var(--color-error); font-size: 0.875rem; margin-top: 8px; padding: 8px 12px; background: #fef2f2; border-radius: var(--radius-sm); }
.sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar-section { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px; }
.sidebar-title { font-size: 0.875rem; font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px; }
.ad-slot { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; color: var(--color-text-muted); font-size: 0.75rem; }
.ad-slot-sidebar { width: 300px; height: 250px; }
.ad-slot-banner { width: 100%; height: 90px; margin: 32px 0; }
.ad-slot-native { width: 100%; height: 120px; }
.ai-card { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 20px; background: var(--color-card-bg); }
.ai-card-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.ai-card-logo { width: 40px; height: 40px; border-radius: var(--radius-sm); object-fit: contain; background: var(--color-bg-secondary); }
.ai-card-name { font-size: 1rem; font-weight: 600; }
.ai-card-rating { margin-left: auto; font-size: 0.875rem; color: #f59e0b; font-weight: 600; }
.ai-card-desc { font-size: 0.9375rem; color: var(--color-text-muted); margin-bottom: 12px; }
.ai-card-meta { display: flex; gap: 12px; font-size: 0.8125rem; color: var(--color-text-muted); margin-bottom: 12px; flex-wrap: wrap; }
.badge { display: inline-flex; padding: 2px 8px; border-radius: 12px; font-size: 0.75rem; font-weight: 500; }
.badge-free { background: #dcfce7; color: #16a34a; }
.badge-freemium { background: #dbeafe; color: #2563eb; }
.badge-paid { background: #fce7f3; color: #be185d; }
.ai-card-proscons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 12px; font-size: 0.8125rem; }
.pros { color: var(--color-success); }
.cons { color: var(--color-error); }
.ai-card-scenarios { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.scenario-tag { padding: 3px 10px; background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: 12px; font-size: 0.75rem; color: var(--color-text-muted); }
.ai-card-actions { display: flex; gap: 8px; }
.compare-header { text-align: center; padding: 48px 0 32px; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 32px; }
.compare-tool-card { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; text-align: center; }
.compare-table { width: 100%; border-collapse: collapse; margin-bottom: 32px; }
.compare-table th, .compare-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 0.9375rem; }
.compare-table th { background: var(--color-bg-secondary); font-weight: 600; font-size: 0.875rem; }
.compare-recommendation { background: #eff6ff; border: 1px solid #bfdbfe; border-radius: var(--radius); padding: 24px; margin-bottom: 32px; }
.compare-recommendation h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 12px; color: var(--color-primary); }
.rankings-tabs { display: flex; border-bottom: 2px solid var(--color-border); margin-bottom: 24px; }
.rankings-tab { padding: 12px 24px; font-size: 1rem; font-weight: 500; color: var(--color-text-muted); background: none; border: none; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all var(--transition); cursor: pointer; }
.rankings-tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.ranking-item { display: flex; align-items: center; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--color-border); }
.ranking-number { font-size: 1.25rem; font-weight: 800; color: var(--color-text-muted); width: 32px; flex-shrink: 0; }
.ranking-number.top3 { color: #f59e0b; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--color-text-muted); padding: 16px 0; }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb-sep { color: var(--color-border); }
.tabs { border-bottom: 2px solid var(--color-border); margin-bottom: 24px; display: flex; }
.tab-btn { padding: 12px 24px; font-size: 0.9375rem; font-weight: 500; color: var(--color-text-muted); background: none; border: none; border-bottom: 2px solid transparent; margin-bottom: -2px; cursor: pointer; transition: all var(--transition); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.feedback { display: flex; align-items: center; gap: 12px; padding: 16px 0; border-top: 1px solid var(--color-border); margin-top: 24px; }
.feedback-btns { display: flex; gap: 8px; }
.feedback-btn { padding: 6px 16px; border: 1px solid var(--color-border); border-radius: 20px; background: none; font-size: 0.875rem; transition: all var(--transition); }
.feedback-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.scenario-filter { display: flex; flex-wrap: wrap; gap: 10px; padding: 24px 0; }
.scenario-btn { padding: 8px 18px; border: 1px solid var(--color-border); border-radius: 24px; background: var(--color-bg); font-size: 0.9375rem; color: var(--color-text-muted); cursor: pointer; transition: all var(--transition); }
.scenario-btn:hover, .scenario-btn.active { border-color: var(--color-primary); color: var(--color-primary); background: #eff6ff; }
footer { background: var(--color-bg-secondary); border-top: 1px solid var(--color-border); padding: 32px 0; margin-top: auto; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 0.9375rem; color: var(--color-text-muted); }
.footer-copyright { font-size: 0.875rem; color: var(--color-text-muted); }
@media (max-width: 768px) {
  .tool-layout { grid-template-columns: 1fr; }
  .ad-slot-sidebar { width: 100%; height: 120px; }
  .compare-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .cards-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hero { padding: 40px 0 32px; }
  .nav-links a { font-size: 0.875rem; }
  .section { padding: 32px 0; }
}