/* ===== AI Nav – Shared Styles ===== */

/* CSS Variables */
:root {
  --bg:            #080c14;
  --surface:       #0d1321;
  --card:          #111827;
  --card-hover:    #141e2e;
  --border:        #1a2438;
  --border-bright: #2d3f5e;
  --accent:        #818cf8;
  --accent-hover:  #a5b4fc;
  --accent-dim:    rgba(129,140,248,0.08);
  --accent-glow:   rgba(129,140,248,0.18);
  --text:          #e2e8f0;
  --text-2:        #94a3b8;
  --text-3:        #64748b;
  --star:          #fbbf24;
  --green:         #34d399;
  --amber:         #fbbf24;
  --radius:        10px;
  --radius-sm:     6px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

/* Header */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,12,20,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  height: 58px; display: flex; align-items: center; gap: 16px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 17px; white-space: nowrap; flex-shrink: 0;
}
.logo-icon { font-size: 20px; }
.logo-accent { color: var(--accent); }
.header-spacer { flex: 1; }
.gh-link { color: var(--text-3); font-size: 18px; transition: color 0.15s; flex-shrink: 0; line-height: 1; }
.gh-link:hover { color: var(--text); }
.nav-home {
  padding: 5px 13px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; color: var(--text-3);
  cursor: pointer; transition: all 0.15s; white-space: nowrap;
  border: 1px solid var(--border); background: none;
}
.nav-home:hover { color: var(--text); border-color: var(--border-bright); }

/* Breadcrumb */
.breadcrumb {
  max-width: 1280px; margin: 0 auto; padding: 14px 24px 0;
  font-size: 12px; color: var(--text-3); display: flex; gap: 6px; align-items: center;
}
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { opacity: 0.4; }
.breadcrumb-cur { color: var(--text-2); }

/* Page container */
.page-wrap {
  max-width: 900px; margin: 0 auto; padding: 32px 24px 80px;
}
.page-wrap-wide {
  max-width: 1100px; margin: 0 auto; padding: 32px 24px 80px;
}

/* Article styles */
.article-header { margin-bottom: 32px; }
.article-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 12px; background: var(--accent-dim);
  border: 1px solid rgba(129,140,248,0.25); border-radius: 999px;
  font-size: 11px; color: var(--accent); margin-bottom: 16px; font-weight: 600;
}
.article-title {
  font-size: clamp(24px, 4vw, 38px); font-weight: 800;
  line-height: 1.15; margin-bottom: 14px; letter-spacing: -0.02em;
}
.gradient {
  background: linear-gradient(135deg, #818cf8 0%, #a78bfa 45%, #38bdf8 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.article-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: var(--text-3); margin-bottom: 20px;
}
.article-meta span { display: flex; align-items: center; gap: 5px; }
.article-desc {
  font-size: 16px; color: var(--text-2); line-height: 1.75; max-width: 720px;
}

/* Section headings */
.content h2 {
  font-size: 20px; font-weight: 700; color: var(--text);
  margin: 36px 0 14px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.content h3 {
  font-size: 16px; font-weight: 600; color: var(--text-2);
  margin: 22px 0 10px;
}
.content p {
  font-size: 15px; color: var(--text-2); line-height: 1.75; margin-bottom: 14px;
}
.content ul, .content ol {
  font-size: 15px; color: var(--text-2); line-height: 1.75;
  padding-left: 22px; margin-bottom: 14px;
}
.content li { margin-bottom: 6px; }
.content strong { color: var(--text); font-weight: 600; }
.content a { color: var(--accent); }
.content a:hover { color: var(--accent-hover); text-decoration: underline; }
.content code {
  font-family: 'Fira Code', monospace; font-size: 13px;
  background: var(--card); border: 1px solid var(--border);
  padding: 2px 6px; border-radius: 4px; color: var(--accent);
}

/* Info cards */
.info-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px; margin: 20px 0 28px;
}
.info-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.info-card-label { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.info-card-value { font-size: 16px; font-weight: 700; color: var(--text); }
.info-card-sub { font-size: 12px; color: var(--text-3); margin-top: 3px; }

/* Feature list */
.feature-list { list-style: none; padding: 0; margin: 0 0 20px; }
.feature-list li {
  padding: 10px 14px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 8px;
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 14px; color: var(--text-2);
}
.feature-list li .feat-icon { flex-shrink: 0; font-size: 16px; }
.feature-list li strong { color: var(--text); }

/* Pros/Cons */
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 20px 0 28px; }
.pros-box, .cons-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.pros-box { border-left: 3px solid var(--green); }
.cons-box { border-left: 3px solid #f87171; }
.pros-box h4, .cons-box h4 { font-size: 13px; font-weight: 700; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.06em; }
.pros-box h4 { color: var(--green); }
.cons-box h4 { color: #f87171; }
.pros-box ul, .cons-box ul { list-style: none; padding: 0; margin: 0; }
.pros-box li, .cons-box li { font-size: 13px; color: var(--text-2); padding: 4px 0; display: flex; gap: 7px; }
.pros-box li::before { content: '✓'; color: var(--green); font-weight: 700; flex-shrink: 0; }
.cons-box li::before { content: '✕'; color: #f87171; font-weight: 700; flex-shrink: 0; }

/* Pricing table */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin: 20px 0 28px; }
.pricing-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 16px; text-align: center;
}
.pricing-card.featured { border-color: var(--accent); background: rgba(129,140,248,0.05); }
.pricing-name { font-size: 13px; font-weight: 700; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.pricing-price { font-size: 26px; font-weight: 800; color: var(--text); margin-bottom: 4px; }
.pricing-period { font-size: 11px; color: var(--text-3); margin-bottom: 14px; }
.pricing-features { list-style: none; padding: 0; margin: 0; font-size: 12px; color: var(--text-2); text-align: left; }
.pricing-features li { padding: 4px 0; border-bottom: 1px solid var(--border); }
.pricing-features li:last-child { border-bottom: none; }

/* FAQ */
.faq-section { margin-top: 36px; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.faq-q {
  padding: 14px 16px; font-size: 14px; font-weight: 600; color: var(--text);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  gap: 10px; background: var(--card);
}
.faq-q:hover { background: var(--card-hover); }
.faq-arr { transition: transform 0.2s; color: var(--text-3); flex-shrink: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a-inner { padding: 0 16px 14px; font-size: 14px; color: var(--text-2); line-height: 1.7; }
.faq-item.open .faq-arr { transform: rotate(180deg); }
.faq-item.open .faq-a { max-height: 300px; }

/* Related tools */
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; margin-top: 16px; }
.related-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px; transition: all 0.2s;
}
.related-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.related-card-name { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.related-card-desc { font-size: 11px; color: var(--text-3); }

/* CTA button */
.cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; background: var(--accent);
  border-radius: var(--radius); color: #fff; font-weight: 700; font-size: 14px;
  transition: all 0.2s; border: none; cursor: pointer;
}
.cta-btn:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 16px var(--accent-glow); }
.cta-btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; background: none;
  border: 1px solid var(--border-bright); border-radius: var(--radius);
  color: var(--text-2); font-weight: 600; font-size: 13px; transition: all 0.2s;
}
.cta-btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* Affiliate CTA block */
.affiliate-cta {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 20px 24px;
  background: linear-gradient(135deg, rgba(129,140,248,0.08) 0%, rgba(56,189,248,0.06) 100%);
  border: 1px solid rgba(129,140,248,0.25); border-radius: var(--radius);
  margin: 24px 0;
}
.affiliate-cta-left { flex: 1; }
.affiliate-cta-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.affiliate-cta-desc { font-size: 13px; color: var(--text-2); }
.affiliate-cta-btn { flex-shrink: 0; white-space: nowrap; }
@media (max-width: 480px) {
  .affiliate-cta { flex-direction: column; align-items: flex-start; }
  .affiliate-cta-btn { width: 100%; justify-content: center; }
}

/* Alert box */
.alert {
  padding: 14px 16px; border-radius: var(--radius); margin: 20px 0;
  font-size: 14px; line-height: 1.6;
}
.alert-info { background: rgba(129,140,248,0.08); border: 1px solid rgba(129,140,248,0.2); color: var(--text-2); }
.alert-success { background: rgba(52,211,153,0.08); border: 1px solid rgba(52,211,153,0.2); color: var(--text-2); }

/* Footer */
footer { background: var(--surface); border-top: 1px solid var(--border); margin-top: 60px; }
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 40px 24px 20px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px; margin-bottom: 32px;
}
.footer-brand p { font-size: 13px; color: var(--text-3); margin-top: 10px; line-height: 1.6; }
.footer-col h4 { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { font-size: 13px; color: var(--text-3); transition: color 0.15s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; font-size: 12px; color: var(--text-3); display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }

/* Responsive */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .pros-cons { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr 1fr; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .header-inner { padding: 0 16px; gap: 10px; }
  .nav-home { padding: 5px 10px; font-size: 12px; }
  .page-hero { padding: 28px 0 22px; }
  .article-title { font-size: clamp(22px, 5vw, 32px); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .page-wrap, .page-wrap-wide { padding: 16px 14px 60px; }
  .header-inner { padding: 0 14px; gap: 8px; }
  .logo { font-size: 15px; }
  .logo-icon { font-size: 18px; }
  .article-title { font-size: clamp(20px, 5vw, 28px); }
  .article-desc { font-size: 14px; }
  .cta-btn { padding: 10px 18px; font-size: 13px; }
  .cta-btn-outline { padding: 8px 14px; font-size: 12px; }
}

/* Content page layout with sidebar */
.content-layout { display: grid; grid-template-columns: 1fr 280px; gap: 32px; align-items: start; }
.content-sidebar { position: sticky; top: 74px; }
.sidebar-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; margin-bottom: 14px;
}
.sidebar-card h4 { font-size: 12px; font-weight: 700; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px; }
@media (max-width: 900px) { .content-layout { grid-template-columns: 1fr; } .content-sidebar { position: static; } }

/* Table of contents */
.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { margin-bottom: 6px; }
.toc-list a { font-size: 13px; color: var(--text-3); transition: color 0.15s; display: block; padding: 2px 0; }
.toc-list a:hover { color: var(--accent); }

/* Stars badge */
.stars-badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; background: rgba(251,191,36,0.1);
  border: 1px solid rgba(251,191,36,0.2); border-radius: 999px;
  font-size: 12px; font-weight: 700; color: var(--star);
}

/* Page hero */
.page-hero {
  background: linear-gradient(135deg, rgba(129,140,248,0.05) 0%, rgba(167,139,250,0.05) 100%);
  border-bottom: 1px solid var(--border); padding: 40px 0 32px;
}
.page-hero-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* Contact form */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 7px; }
.form-input, .form-textarea, .form-select {
  width: 100%; padding: 10px 14px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-size: 14px; outline: none; transition: border-color 0.15s;
  font-family: inherit;
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-3); }
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--accent); }
.form-textarea { resize: vertical; min-height: 120px; }

/* Policy content */
.policy-content { max-width: 760px; }
.policy-content h2 { font-size: 18px; font-weight: 700; color: var(--text); margin: 32px 0 12px; }
.policy-content p, .policy-content li { font-size: 14px; color: var(--text-2); line-height: 1.75; margin-bottom: 10px; }
.policy-content ul { padding-left: 20px; }

/* Tag chips */
.tag-chip {
  font-size: 11px; padding: 3px 9px; border-radius: 4px;
  background: rgba(30,41,59,0.8); color: var(--text-3); border: 1px solid var(--border);
  display: inline-block; margin: 2px;
}

/* Category page – tool list */
.category-tool-list { display: flex; flex-direction: column; gap: 10px; }
.category-tool-card {
  display: flex; align-items: flex-start; gap: 14px; padding: 18px 20px;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  text-decoration: none; color: inherit; transition: border-color .2s, box-shadow .2s;
}
.category-tool-card:hover { border-color: var(--accent); box-shadow: 0 4px 20px rgba(0,0,0,.2); }
.ctc-rank {
  font-size: 12px; font-weight: 700; color: var(--text-3);
  min-width: 26px; padding-top: 3px; flex-shrink: 0;
}
.ctc-body { flex: 1; min-width: 0; }
.ctc-header {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 5px;
}
.ctc-name { font-size: 15px; font-weight: 700; color: var(--text); }
.ctc-desc { font-size: 13px; color: var(--text-2); line-height: 1.55; margin-bottom: 8px; }
.ctc-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.ctc-arrow { font-size: 16px; color: var(--text-3); padding-top: 3px; flex-shrink: 0; transition: color .2s; }
.category-tool-card:hover .ctc-arrow { color: var(--accent); }
@media (max-width: 600px) {
  .ctc-rank { display: none; }
  .category-tool-card { padding: 14px 16px; }
}

/* Language toggle */
.lang-toggle {
  display: flex; align-items: center; gap: 4px;
  background: rgba(30,41,59,.6); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px 6px;
}
.lang-btn {
  font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px;
  color: var(--text-3); cursor: pointer; transition: all .15s;
  background: transparent; border: none; outline: none;
}
.lang-btn.active { background: var(--accent); color: #fff; }
.lang-btn:not(.active):hover { color: var(--text); }

/* Bilingual visibility rules */
[data-lang="zh"] .en { display: none !important; }
[data-lang="en"] .zh { display: none !important; }

/* Affiliate Disclosure */
.affiliate-disclosure {
  font-size: 12px; color: var(--text-3); padding: 10px 14px;
  background: rgba(30,41,59,.5); border-left: 3px solid var(--border-bright);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 24px 0;
  line-height: 1.6;
}