/* RAG入档助手 Showcase — 档案室风格 */

:root {
  --ink: #0f1a24;
  --ink-soft: #2a3d4f;
  --paper: #f4f0e8;
  --paper-warm: #ebe4d6;
  --paper-card: #faf7f0;
  --accent: #c45c26;
  --teal: #1a5c5a;
  --teal-soft: #2d7a77;
  --success: #1f6b42;
  --warn: #9a6b1a;
  --fail: #a83232;
  --border: rgba(15, 26, 36, 0.12);
  --shadow: 0 12px 40px rgba(15, 26, 36, 0.08);
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "IBM Plex Sans", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Consolas", monospace;
  --radius: 10px;
  --radius-lg: 16px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  min-height: 100vh;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.85rem 2rem;
  background: rgba(244, 240, 232, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  background: var(--teal);
  color: var(--paper);
  border-radius: 6px;
  font-family: var(--font-serif);
  font-weight: 700;
}

.nav { display: flex; gap: 1.25rem; margin-left: auto; }
.nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; font-weight: 500; }
.nav a:hover { color: var(--accent); }

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: var(--paper-warm);
  border: 1px solid var(--border);
}

.badge-safe {
  background: rgba(26, 92, 90, 0.1);
  color: var(--teal);
  border-color: rgba(26, 92, 90, 0.25);
}

.hero { max-width: 1100px; margin: 0 auto; padding: 4rem 2rem 3rem; }
.eyebrow { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--teal); margin: 0 0 1rem; }
.hero h1 { font-family: var(--font-serif); font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.25; margin: 0 0 1.25rem; max-width: 18ch; }
.hero h1 em { font-style: normal; color: var(--accent); }
.lead { font-size: 1.1rem; color: var(--ink-soft); max-width: 52ch; margin: 0 0 1.75rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s;
}

.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--teal); color: var(--paper); box-shadow: 0 4px 14px rgba(26, 92, 90, 0.35); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--border); }
.btn-block { width: 100%; }
.btn-sm { padding: 0.45rem 0.85rem; font-size: 0.85rem; }

.disclaimer {
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.5);
  border-left: 3px solid var(--warn);
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: 680px;
}

.disclaimer code { font-family: var(--font-mono); font-size: 0.82em; background: var(--paper-warm); padding: 0.1em 0.35em; border-radius: 4px; }

.hero-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.5rem 2rem;
  align-items: center;
  margin-top: 3rem;
  padding: 1.75rem 2rem;
  background: var(--paper-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-card-icon {
  width: 3.5rem; height: 3.5rem;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--teal), #0d3d3b);
  color: var(--paper); border-radius: 12px;
  font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700;
}

.hero-card-label { font-size: 0.8rem; color: var(--success); font-weight: 600; margin: 0 0 0.25rem; }
.hero-card h2 { font-family: var(--font-serif); font-size: 1.5rem; margin: 0 0 0.35rem; }
.hero-card-flow { font-size: 0.9rem; color: var(--ink-soft); margin: 0; }
.hero-stats { display: flex; gap: 1.5rem; }
.hero-stats strong { display: block; font-size: 1.35rem; color: var(--teal); }
.hero-stats span { font-size: 0.75rem; color: var(--ink-soft); }

.section { max-width: 1100px; margin: 0 auto; padding: 4rem 2rem; }
.section-tag { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.14em; color: var(--accent); margin: 0 0 0.5rem; }
.section h2 { font-family: var(--font-serif); font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 0.75rem; }
.section-desc { color: var(--ink-soft); max-width: 60ch; margin: 0 0 2rem; }

.demo-section {
  background: linear-gradient(180deg, var(--paper-warm) 0%, var(--paper) 100%);
  max-width: none;
  padding-left: max(2rem, calc((100vw - 1100px) / 2));
  padding-right: max(2rem, calc((100vw - 1100px) / 2));
}

.demo-grid { display: grid; grid-template-columns: 280px 1fr; gap: 1.5rem; }
.demo-sidebar {
  background: var(--paper-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.25rem; position: sticky; top: 5rem;
}
.demo-sidebar-title { font-size: 0.85rem; font-weight: 600; margin: 0 0 0.75rem; color: var(--ink-soft); }
.scenario-list { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1rem; }

.scenario-btn {
  text-align: left; padding: 0.75rem 0.85rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--paper); cursor: pointer; font-family: inherit;
}
.scenario-btn:hover { border-color: var(--teal-soft); }
.scenario-btn.active { border-color: var(--teal); background: rgba(26, 92, 90, 0.08); }
.scenario-btn .fname { display: block; font-family: var(--font-mono); font-size: 0.78rem; word-break: break-all; margin-bottom: 0.25rem; }
.scenario-btn .hint { font-size: 0.75rem; color: var(--ink-soft); }

.demo-main {
  background: var(--paper-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow);
}

.demo-chat-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
  background: rgba(26, 92, 90, 0.04);
}

.demo-bot-avatar {
  width: 2.25rem; height: 2.25rem; display: grid; place-items: center;
  background: var(--teal); color: white; border-radius: 8px;
  font-family: var(--font-serif); font-weight: 700;
}

.demo-bot-meta { display: block; font-size: 0.78rem; color: var(--ink-soft); }
.demo-chat-header .badge { margin-left: auto; }

.step-track {
  display: flex; flex-wrap: wrap; gap: 0.35rem; list-style: none;
  margin: 0; padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--border);
}

.step-track li {
  flex: 1 1 auto; min-width: 90px; font-size: 0.72rem;
  padding: 0.4rem 0.5rem; border-radius: 6px;
  background: var(--paper-warm); color: var(--ink-soft); text-align: center;
}

.step-track li.active { background: var(--teal); color: white; font-weight: 600; }
.step-track li.done { background: rgba(31, 107, 66, 0.15); color: var(--success); }

.demo-feed {
  min-height: 220px; max-height: 320px; overflow-y: auto;
  padding: 1rem 1.25rem; display: flex; flex-direction: column; gap: 0.65rem;
}

.feed-placeholder { color: var(--ink-soft); font-size: 0.9rem; margin: auto; }

.feed-msg {
  max-width: 88%; padding: 0.65rem 0.9rem; border-radius: var(--radius);
  font-size: 0.88rem; animation: fadeUp 0.35s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.feed-msg.user { align-self: flex-end; background: rgba(26, 92, 90, 0.12); border: 1px solid rgba(26, 92, 90, 0.2); }
.feed-msg.bot { align-self: flex-start; background: white; border: 1px solid var(--border); }
.feed-msg.system { align-self: center; font-size: 0.8rem; color: var(--ink-soft); background: var(--paper-warm); }
.feed-msg .mono { font-family: var(--font-mono); font-size: 0.82em; }

.demo-result { border-top: 1px solid var(--border); padding: 1rem 1.25rem; background: rgba(26, 92, 90, 0.03); }
.demo-result.hidden { display: none; }
.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }

.result-stamp { font-family: var(--font-serif); font-weight: 700; font-size: 1.1rem; padding: 0.25rem 0.75rem; border-radius: 6px; }
.result-stamp.success { background: rgba(31, 107, 66, 0.15); color: var(--success); }
.result-stamp.reject { background: rgba(168, 50, 50, 0.12); color: var(--fail); }
.result-stamp.unsupported { background: rgba(154, 107, 26, 0.15); color: var(--warn); }

.report-preview {
  font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.5;
  background: var(--ink); color: #c8d4dc; padding: 1rem; border-radius: var(--radius);
  overflow-x: auto; max-height: 200px; margin: 0; white-space: pre-wrap;
}

.workflow-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.workflow-card { padding: 1.35rem; background: var(--paper-card); border: 1px solid var(--border); border-radius: var(--radius-lg); }
.workflow-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); transition: 0.2s; }
.wf-num { display: block; font-size: 0.75rem; font-weight: 700; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 0.5rem; }
.workflow-card h3 { font-family: var(--font-serif); font-size: 1.1rem; margin: 0 0 0.5rem; }
.workflow-card p { font-size: 0.88rem; color: var(--ink-soft); margin: 0; }
.workflow-card code { font-family: var(--font-mono); font-size: 0.85em; background: var(--paper-warm); padding: 0.1em 0.3em; border-radius: 3px; }

.stack-bar {
  display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem;
  padding: 1.25rem 1.5rem; background: var(--ink);
  color: rgba(244, 240, 232, 0.85); border-radius: var(--radius-lg); font-size: 0.88rem;
}
.stack-bar strong { color: var(--paper); }

.guardrails-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.guard-col h3 { font-family: var(--font-serif); font-size: 1.15rem; margin: 0 0 1rem; color: var(--teal); }
.guard-col ul { margin: 0; padding-left: 1.2rem; }
.guard-col li { margin-bottom: 0.5rem; font-size: 0.92rem; color: var(--ink-soft); }
.guard-col code { font-family: var(--font-mono); font-size: 0.85em; background: var(--paper-warm); padding: 0.1em 0.3em; border-radius: 3px; }

.guard-example {
  margin-top: 1.5rem; padding: 1rem 1.15rem;
  background: rgba(196, 92, 38, 0.08); border: 1px solid rgba(196, 92, 38, 0.2); border-radius: var(--radius);
}
.guard-flow { font-size: 0.85rem; font-weight: 600; color: var(--accent); margin: 0.5rem 0 0; }

.evidence-timeline { display: flex; flex-direction: column; gap: 1rem; }
.evidence-item {
  display: grid; grid-template-columns: auto 1fr; gap: 1.25rem;
  padding: 1.25rem 1.5rem; background: var(--paper-card);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.ev-num {
  width: 2.5rem; height: 2.5rem; display: grid; place-items: center;
  background: var(--teal); color: white; border-radius: 50%; font-weight: 700;
}
.evidence-item h3 { font-family: var(--font-serif); font-size: 1.05rem; margin: 0 0 0.35rem; }
.evidence-item p { font-size: 0.9rem; color: var(--ink-soft); margin: 0 0 0.5rem; }
.evidence-item code { font-family: var(--font-mono); font-size: 0.85em; background: var(--paper-warm); padding: 0.1em 0.35em; border-radius: 3px; }
.ev-tag { font-size: 0.75rem; color: var(--teal); font-weight: 500; }
.evidence-note { margin-top: 2rem; padding: 1rem 1.25rem; background: var(--paper-warm); border-radius: var(--radius); font-size: 0.9rem; color: var(--ink-soft); }

.site-footer { border-top: 1px solid var(--border); padding: 2rem; text-align: center; font-size: 0.88rem; color: var(--ink-soft); }
.site-footer strong { color: var(--ink); display: block; margin-bottom: 0.25rem; }
.site-footer code { font-family: var(--font-mono); font-size: 0.85em; }

.report-modal { border: none; padding: 0; max-width: min(680px, 92vw); border-radius: var(--radius-lg); }
.report-modal::backdrop { background: rgba(15, 26, 36, 0.55); }
.modal-inner { background: var(--paper-card); border-radius: var(--radius-lg); overflow: hidden; }
.modal-inner header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); }
.modal-inner h3 { font-family: var(--font-serif); margin: 0; }
.modal-close { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--ink-soft); }
.modal-report { padding: 1.25rem 1.5rem; max-height: 70vh; overflow-y: auto; font-size: 0.92rem; }
.modal-report h4 { font-family: var(--font-serif); margin: 1rem 0 0.5rem; color: var(--teal); }
.modal-report table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin: 0.75rem 0; }
.modal-report th, .modal-report td { border: 1px solid var(--border); padding: 0.45rem 0.6rem; text-align: left; }
.modal-report th { background: var(--paper-warm); }

@media (max-width: 860px) {
  .site-header { flex-wrap: wrap; padding: 0.75rem 1rem; }
  .nav { order: 3; width: 100%; margin-left: 0; }
  .hero-card { grid-template-columns: 1fr; text-align: center; }
  .hero-stats { justify-content: center; }
  .demo-grid { grid-template-columns: 1fr; }
  .demo-sidebar { position: static; }
  .guardrails-grid { grid-template-columns: 1fr; }
}