/* ===== AI 栏目公共样式 =====
   所有 /ai/ 子页面共享此文件
   主页 ai.html 的样式内联在自身中
   ===== */

:root {
  --ai-primary: #6C5CE7;
  --ai-primary-light: #A29BFE;
  --ai-primary-dark: #4834D4;
  --ai-accent: #00D2D3;
  --ai-gradient: linear-gradient(135deg, #6C5CE7 0%, #00D2D3 100%);
  --ai-bg-dark: #0F0E17;
  --ai-bg-card: #1A1929;
  --ai-text: #FFFFFE;
  --ai-text-muted: #A7A9BE;
  --ai-border: rgba(108, 92, 231, 0.2);
}

/* ===== Sub-page Hero ===== */
.ai-sub-hero {
  background: var(--ai-bg-dark);
  color: var(--ai-text);
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}
.ai-sub-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108,92,231,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.ai-sub-hero .container { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; padding: 0 24px; }
.ai-breadcrumb {
  font-size: 14px;
  color: var(--ai-text-muted);
  margin-bottom: 24px;
}
.ai-breadcrumb a { color: var(--ai-primary-light); text-decoration: none; }
.ai-breadcrumb a:hover { text-decoration: underline; }
.ai-breadcrumb span { margin: 0 6px; }
.ai-sub-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.ai-sub-hero-badge.collect { background: rgba(0,210,211,0.12); color: #00D2D3; border: 1px solid rgba(0,210,211,0.3); }
.ai-sub-hero-badge.insight { background: rgba(108,92,231,0.12); color: #A29BFE; border: 1px solid rgba(108,92,231,0.3); }
.ai-sub-hero-badge.execute { background: rgba(253,121,168,0.12); color: #FD79A8; border: 1px solid rgba(253,121,168,0.3); }
.ai-sub-hero-badge.evidence { background: rgba(253,203,110,0.12); color: #FDCB6E; border: 1px solid rgba(253,203,110,0.3); }
.ai-sub-hero-badge.multi { background: rgba(85,239,196,0.12); color: #55EFC4; border: 1px solid rgba(85,239,196,0.3); }
.ai-sub-hero h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}
.ai-sub-hero h1 em {
  font-style: normal;
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ai-sub-hero .lead {
  font-size: 17px;
  color: var(--ai-text-muted);
  line-height: 1.7;
  max-width: 650px;
}

/* ===== Sections ===== */
.ai-section {
  background: var(--ai-bg-dark);
  color: var(--ai-text);
  padding: 80px 0;
}
.ai-section.alt { background: #13121E; }
.ai-section .container { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.ai-section h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
}
.ai-section h2 em {
  font-style: normal;
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  color: var(--ai-text-muted);
  font-size: 16px;
  margin-bottom: 40px;
  max-width: 600px;
}

/* ===== Pain Grid ===== */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.pain-card {
  background: var(--ai-bg-card);
  border: 1px solid var(--ai-border);
  border-radius: 14px;
  padding: 28px;
}
.pain-icon { font-size: 32px; display: block; margin-bottom: 14px; }
.pain-card h3 { font-size: 17px; font-weight: 700; color: var(--ai-text); margin-bottom: 8px; }
.pain-card p { font-size: 14px; color: var(--ai-text-muted); line-height: 1.6; }

/* ===== Feature List ===== */
.feature-list { margin-top: 32px; }
.feature-item {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.feature-item:last-child { border-bottom: none; }
.feature-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--ai-primary);
  opacity: 0.4;
  min-width: 60px;
  line-height: 1;
}
.feature-content h3 { font-size: 18px; font-weight: 700; color: var(--ai-text); margin-bottom: 8px; }
.feature-content p { font-size: 14px; color: var(--ai-text-muted); line-height: 1.7; }

/* ===== Voice Examples ===== */
.voice-examples {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}
.voice-card {
  background: var(--ai-bg-card);
  border: 1px solid var(--ai-border);
  border-radius: 14px;
  padding: 24px;
}
.voice-icon { font-size: 24px; margin-bottom: 12px; display: block; }
.voice-text { font-size: 15px; font-weight: 600; color: var(--ai-text); margin-bottom: 10px; }
.voice-result { font-size: 13px; color: var(--ai-text-muted); line-height: 1.5; }

/* ===== Chat Demo ===== */
.chat-demo {
  max-width: 700px;
  margin: 32px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.chat-bubble {
  padding: 16px 20px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.7;
  max-width: 85%;
}
.chat-bubble.user {
  background: var(--ai-primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.chat-bubble.ai {
  background: var(--ai-bg-card);
  border: 1px solid var(--ai-border);
  color: var(--ai-text-muted);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.chat-bubble.ai strong { color: var(--ai-text); }
.chat-meta {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: rgba(167,169,190,0.6);
}
.chat-confirm {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 14px;
  background: rgba(108,92,231,0.15);
  border: 1px solid rgba(108,92,231,0.3);
  border-radius: 8px;
  font-size: 13px;
  color: var(--ai-primary-light);
}

/* ===== Compare Table ===== */
.compare-inline { margin-top: 32px; overflow-x: auto; }
.compare-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--ai-border);
}
.compare-table th, .compare-table td {
  padding: 14px 20px;
  text-align: left;
  font-size: 14px;
  color: var(--ai-text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.compare-table th { background: var(--ai-bg-card); color: var(--ai-text); font-weight: 600; }
.compare-table td:first-child { font-weight: 600; color: var(--ai-text); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .highlight { color: var(--ai-accent); }

/* ===== Principle / Evidence / Safety / Role Cards ===== */
.principle-cards, .evidence-grid, .safety-grid, .role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.principle-card, .evidence-card, .safety-card, .role-card {
  background: var(--ai-bg-card);
  border: 1px solid var(--ai-border);
  border-radius: 14px;
  padding: 28px;
}
.principle-card h3, .evidence-card h3, .safety-card h3, .role-card h3 {
  font-size: 17px; font-weight: 700; color: var(--ai-text); margin-bottom: 10px;
}
.principle-card p, .evidence-card p, .safety-card p, .role-card p {
  font-size: 14px; color: var(--ai-text-muted); line-height: 1.6;
}
.evidence-icon, .role-icon { font-size: 32px; margin-bottom: 14px; display: block; }
.evidence-example {
  margin-top: 12px;
  padding: 8px 12px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
  font-size: 12px;
  color: var(--ai-accent);
  font-family: monospace;
}
.safety-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ai-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  margin-bottom: 14px;
}

/* ===== More Navigation ===== */
.ai-more {
  background: #13121E;
  padding: 60px 0;
}
.ai-more .container { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.ai-more h2 { font-size: 24px; font-weight: 700; color: var(--ai-text); margin-bottom: 24px; text-align: center; }
.ai-more-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.ai-more-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: var(--ai-bg-card);
  border: 1px solid var(--ai-border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--ai-text);
  font-size: 14px;
  transition: all 0.3s;
}
.ai-more-card:hover {
  border-color: var(--ai-primary);
  transform: translateY(-2px);
}
.ai-more-card .arrow {
  margin-left: auto;
  color: var(--ai-primary-light);
  opacity: 0;
  transition: opacity 0.3s;
}
.ai-more-card:hover .arrow { opacity: 1; }

/* ===== CTA ===== */
.ai-cta {
  background: var(--ai-bg-dark);
  padding: 80px 0;
  text-align: center;
}
.ai-cta .container { max-width: 700px; margin: 0 auto; padding: 0 24px; }
.ai-cta h2 { font-size: 32px; font-weight: 700; color: var(--ai-text); margin-bottom: 16px; }
.ai-cta p { color: var(--ai-text-muted); font-size: 16px; margin-bottom: 32px; }
.btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-ai-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ai-gradient); color: white;
  padding: 14px 28px; border-radius: 10px;
  font-weight: 600; font-size: 15px;
  text-decoration: none; transition: all 0.3s;
}
.btn-ai-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,92,231,0.3); }
.btn-ai-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--ai-text);
  padding: 14px 28px; border-radius: 10px;
  font-weight: 600; font-size: 15px;
  text-decoration: none; border: 1px solid rgba(255,255,255,0.2);
  transition: all 0.3s;
}
.btn-ai-secondary:hover { border-color: var(--ai-primary); background: rgba(108,92,231,0.08); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .ai-sub-hero h1 { font-size: 32px; }
  .ai-sub-hero { padding: 80px 0 60px; }
  .pain-grid, .voice-examples { grid-template-columns: 1fr; }
  .feature-item { flex-direction: column; gap: 12px; }
  .feature-number { font-size: 28px; }
  .chat-bubble { max-width: 95%; }
}


/* ===== FAQ ===== */
.faq-list { margin-top: 32px; max-width: 800px; background: transparent; border: none; box-shadow: none; overflow: visible; }
.faq-item {
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0;
}
.faq-item summary {
  padding: 20px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ai-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::after {
  content: '+';
  font-size: 20px;
  color: var(--ai-primary-light);
  transition: transform 0.3s;
  position: static;
  right: auto;
  top: auto;
  transform: none;
}
.faq-item[open] summary::after {
  content: '−';
  transform: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .faq-question { position: static; }
.faq-item .faq-question:hover { background: transparent; }
.faq-answer {
  padding: 0 0 20px;
  font-size: 14px;
  color: var(--ai-text-muted);
  line-height: 1.8;
}
.faq-answer p { margin-bottom: 12px; color: var(--ai-text-muted); line-height: 1.8; }
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer a { color: var(--ai-primary-light); text-decoration: none; }
.faq-answer a:hover { text-decoration: underline; }

/* ===== Key Takeaways ===== */
.key-takeaways {
  background: rgba(108,92,231,0.06);
  border: 1px solid var(--ai-border);
  border-radius: 14px;
  padding: 28px 32px;
}
.takeaway-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}
.takeaway-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--ai-text-muted);
  line-height: 1.6;
}
.takeaway-icon {
  color: var(--ai-accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}