/* DeepRAG Showcase - 深色科技风主题 */
/* Inspired by Vercel/Linear dark aesthetics */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --bg-card-hover: #22222e;
  --border: #2a2a3a;
  --border-bright: #3a3a4e;
  --text-primary: #e4e4ef;
  --text-secondary: #a0a0b8;
  --text-muted: #666680;
  --accent-blue: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-2: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
  --glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --radius: 12px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans CJK SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* === 导航栏 === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar .nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.navbar .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.navbar .nav-links a:hover {
  color: var(--text-primary);
}

.navbar .cta-btn {
  background: var(--gradient-1);
  color: white;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.navbar .cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

/* === Hero 区块 === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(42, 42, 58, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 42, 58, 0.3) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero .badge {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--accent-blue);
  padding: 0.4rem 1rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, #e4e4ef 0%, #a0a0b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .highlight {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
}

.hero .typewriter {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-size: 1rem;
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 1;
  min-height: 1.5em;
}

.hero .typewriter::after {
  content: '|';
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero .cta-group {
  display: flex;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.hero .cta-primary {
  background: var(--gradient-1);
  color: white;
  padding: 0.875rem 2rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero .cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.hero .cta-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  padding: 0.875rem 2rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero .cta-secondary:hover {
  border-color: var(--accent-blue);
  background: var(--bg-card-hover);
}

/* Demo 即将上线按钮 */
.demo-coming {
  opacity: 0.65;
  cursor: not-allowed;
  border-style: dashed !important;
}
.demo-coming:hover {
  opacity: 0.8;
  transform: none !important;
  box-shadow: none !important;
}

/* === 通用 Section === */
.section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header .section-label {
  color: var(--accent-blue);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* === 项目背景 === */
.pain-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.pain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.pain-card:hover {
  border-color: var(--accent-pink);
  transform: translateY(-4px);
}

.pain-card .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.pain-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.pain-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.comparison-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.comparison-box .col {
  padding: 1.5rem;
  border-radius: 8px;
}

.comparison-box .col.bad {
  background: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.comparison-box .col.good {
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.comparison-box .col h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.comparison-box .col.bad h4 { color: #ef4444; }
.comparison-box .col.good h4 { color: var(--accent-green); }

.comparison-box .col pre {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  line-height: 1.6;
}

/* === Pipeline === */
.pipeline-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  overflow-x: auto;
}

#mermaid-pipeline {
  display: flex;
  justify-content: center;
}

.pipeline-legend {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

/* === Agentic 路由 === */
.routing-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
}

#routing-graph {
  width: 100%;
  height: 450px;
}

.routing-controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.routing-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-bright);
  color: var(--text-secondary);
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.routing-btn:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.routing-btn.active {
  background: var(--gradient-2);
  border-color: transparent;
  color: white;
}

/* === 技术栈 === */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.tech-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
}

.tech-card .tech-name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.tech-card .tech-role {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* === 性能数据 === */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.chart-card h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.chart-card .chart-source {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.chart-card canvas {
  width: 100% !important;
  max-height: 280px;
}

/* === 版本演进 === */
.version-timeline {
  position: relative;
  padding-left: 2rem;
}

.version-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.version-item {
  position: relative;
  padding-bottom: 1.5rem;
}

.version-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-blue);
  z-index: 1;
}

.version-item .version-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.25rem;
}

.version-item .version-tag {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-blue);
  font-size: 0.95rem;
}

.version-item .version-date {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.version-item .version-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.version-item .version-accuracy {
  display: inline-block;
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-blue);
  padding: 0.15rem 0.6rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
  background: var(--bg-secondary);
}

.footer .footer-links {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.footer .footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer .footer-links a:hover {
  color: var(--text-primary);
}

.footer .footer-text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* === 响应式 === */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .section { padding: 4rem 1rem; }
  .section-header h2 { font-size: 1.75rem; }
  .comparison-box { grid-template-columns: 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  .navbar .nav-links { gap: 1rem; }
  .navbar .nav-links a:not(.cta-btn) { display: none; }
}

/* === 滚动动画 === */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Mermaid 自定义主题覆盖 === */
.mermaid .node rect,
.mermaid .node polygon {
  stroke-width: 2px !important;
}

.mermaid .edgeLabel {
  background-color: var(--bg-card) !important;
  color: var(--text-secondary) !important;
}