/* ═══════════════════════════════════════════════════════════════
   MyCloudAI 价值投资 - Global Stylesheet
   蓝色主题 · 毛玻璃效果 · 原创设计
   ═══════════════════════════════════════════════════════════════ */

/* ─── CSS Variables ─────────────────────────────────────────── */
:root {
  --bg-primary: #0A1628;
  --bg-secondary: #0F2044;
  --bg-card: rgba(255,255,255,0.06);
  --bg-card-hover: rgba(255,255,255,0.10);
  --color-primary: #2563EB;
  --color-accent: #38BDF8;
  --color-accent2: #60A5FA;
  --text-primary: #F0F4FF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: rgba(56,189,248,0.15);
  --sidebar-bg: #060E1A;
  --sidebar-width: 260px;
  --font-serif: 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
}

/* ─── Light Theme ──────────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary: #F0F4FF;
  --bg-secondary: #E8EFFE;
  --bg-card: rgba(255,255,255,0.85);
  --bg-card-hover: rgba(255,255,255,0.95);
  --border: rgba(37, 99, 235, 0.15);
  --text-primary: #0A1628;
  --text-secondary: #1E3A5F;
  --text-muted: #4A6FA5;
  --sidebar-bg: #E0E8F8;
  --color-primary: #2563EB;
  --color-accent: #1D4ED8;
  --color-accent2: #2563EB;
  --shadow: 0 2px 12px rgba(37, 99, 235, 0.1);
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--color-accent2);
}

/* ─── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(56,189,248,0.2);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56,189,248,0.4);
}

/* ─── Sidebar ───────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ─── Sidebar Collapse Button (bottom of sidebar) ───────────── */
.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 16px;
  background: var(--bg-hover, rgba(255,255,255,0.04));
  border: none;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}
.sidebar-toggle:hover {
  background: var(--accent-dim, rgba(56,189,248,0.10));
  color: var(--color-accent);
}
.sidebar-toggle svg {
  flex-shrink: 0;
  transition: transform 0.3s;
}
.sidebar-toggle-label {
  letter-spacing: 0.02em;
}

/* ─── Sidebar Expand Button (shown when collapsed) ──────────── */
.sidebar-expand-btn {
  display: none;
  position: fixed;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  z-index: 200;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 0 10px 10px 0;
  padding: 14px 8px;
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  box-shadow: 3px 0 16px rgba(56,189,248,0.35);
  transition: background 0.2s, box-shadow 0.2s, padding 0.2s;
  line-height: 1;
}
.sidebar-expand-btn:hover {
  background: var(--accent-hover, #0ea5e9);
  box-shadow: 3px 0 22px rgba(56,189,248,0.5);
  padding-right: 12px;
}
.sidebar-expand-btn::before {
  content: "▶";
  font-size: 0.85rem;
  writing-mode: horizontal-tb;
}

/* ─── Collapsed State ────────────────────────────────────────── */
body.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}
body.sidebar-collapsed .main-content {
  margin-left: 0;
}
body.sidebar-collapsed .site-header {
  left: 0;
}
body.sidebar-collapsed .sidebar-expand-btn {
  display: flex;
}
body.sidebar-collapsed .right-panel {
  right: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}
.logo-link:hover { color: var(--color-accent); }

.logo-img {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* ─── Nav Logo (PNG version) ────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}
.nav-logo:hover { color: var(--color-accent); }
.nav-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  flex-shrink: 0;
}
.nav-logo-text {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.nav-logo-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.sidebar-search {
  padding: 12px 16px;
  position: relative;
}

.sidebar-search input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}
.sidebar-search input:focus {
  border-color: var(--color-accent);
}
.sidebar-search input::placeholder {
  color: var(--text-muted);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 16px;
  right: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  max-height: 400px;
  overflow-y: auto;
  display: none;
  z-index: 200;
}
.search-results.active {
  display: block;
}
.search-result-item {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 0.85rem;
  transition: background 0.15s;
}
.search-result-item:hover {
  background: var(--bg-card-hover);
  color: var(--color-accent);
}
.search-result-cat {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ─── Sidebar Navigation ───────────────────────────────────── */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.nav-group {
  margin-bottom: 2px;
}

.nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  user-select: none;
  transition: color 0.15s, background 0.15s;
  border-left: 3px solid transparent;
}
.nav-group-header:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}
.nav-group-header .arrow {
  transition: transform 0.2s;
  font-size: 0.7rem;
}
.nav-group.open .arrow {
  transform: rotate(90deg);
}
.nav-group-count {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-left: 6px;
}

.nav-group-items {
  display: none;
  padding: 0 0 4px 0;
}
.nav-group.open .nav-group-items {
  display: block;
}

.nav-item {
  display: block;
  padding: 5px 16px 5px 28px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-item:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-left-color: rgba(56,189,248,0.3);
}
.nav-item.active {
  color: var(--color-accent);
  background: rgba(37,99,235,0.1);
  border-left-color: var(--color-accent);
  font-weight: 500;
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-footer-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: var(--text-secondary);
  border-radius: 8px;
  font-size: 0.85rem;
  transition: all 0.15s;
}
.sidebar-footer-link:hover {
  background: var(--bg-card);
  color: var(--color-accent);
}

/* ─── GitHub Link ───────────────────────────────────────────── */
.github-link {
  display: flex;
  align-items: center;
  gap: 6px;
}
.github-link svg {
  flex-shrink: 0;
  opacity: 0.8;
}

/* ─── Hamburger ─────────────────────────────────────────────── */
.hamburger {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 101;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 1.3rem;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* ─── Site Header (Search Button Bar) ───────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 10px 24px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  transition: left 0.3s ease;
}

/* ─── Search Open Button ─────────────────────────────────── */
.search-open-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}
.search-open-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.search-kbd-hint {
  font-size: 10px;
  padding: 1px 5px;
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  margin-left: 2px;
}

/* ─── Spotlight Search Modal ─────────────────────────────── */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 9000;
  display: none;
  backdrop-filter: blur(2px);
}
.search-overlay.active { display: block; }

.search-modal {
  position: fixed;
  top: 15%;
  left: 50%;
  transform: translateX(-50%) scale(0.95);
  width: 90%;
  max-width: 640px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  z-index: 9001;
  display: none;
  overflow: hidden;
  transition: transform 0.15s ease, opacity 0.15s ease;
  opacity: 0;
}
.search-modal.active {
  display: block;
  transform: translateX(-50%) scale(1);
  opacity: 1;
}

.search-modal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.search-modal-icon { font-size: 18px; opacity: 0.6; flex-shrink: 0; }
.search-modal-header input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 17px;
  color: var(--text-primary);
  caret-color: var(--color-accent);
  font-family: var(--font-sans);
}
.search-modal-header input::placeholder { color: var(--text-muted); }
.search-modal-esc {
  font-size: 11px;
  padding: 2px 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.search-modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
  border-radius: 6px;
  flex-shrink: 0;
}
.search-modal-close-btn:hover { background: var(--bg-card); color: var(--text-primary); }

.search-modal-results {
  max-height: 420px;
  overflow-y: auto;
}

.spotlight-result-item {
  padding: 12px 20px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.spotlight-result-item:last-child { border-bottom: none; }
.spotlight-result-item:hover,
.spotlight-result-item.selected {
  background: var(--bg-card-hover);
}
.search-result-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
}
.search-result-snippet {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.search-result-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
}
.search-result-arrow { opacity: 0.4; }
.spotlight-result-item:hover .search-result-arrow,
.spotlight-result-item.selected .search-result-arrow { opacity: 1; color: var(--color-accent); }

.spotlight-result-item mark,
.spotlight-result-item .search-hl {
  background: rgba(250, 204, 21, 0.3);
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}

.search-modal-footer {
  display: flex;
  gap: 16px;
  padding: 10px 20px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
}
.search-no-results {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* Search highlight in snippet */
.search-hl {
  background: rgba(56,189,248,0.25);
  color: var(--color-accent);
  border-radius: 2px;
  padding: 0 1px;
}

/* ─── Mobile Search Button ──────────────────────────────────── */
.mobile-search-btn {
  display: none;
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 101;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}
.mobile-search-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ─── Keyword Highlight in Article ──────────────────────────── */
.highlight-mark {
  background: rgba(56,189,248,0.3);
  color: var(--color-accent);
  border-radius: 2px;
  padding: 1px 3px;
  border-bottom: 2px solid var(--color-accent);
}
[data-theme="light"] .highlight-mark {
  background: rgba(37,99,235,0.15);
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ─── Xref Chip Modal ───────────────────────────────────────── */
.xref-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 600;
}

.xref-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0;
  width: 90%;
  max-width: 480px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
  animation: slideIn 0.25s ease;
}

.xref-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}
.xref-modal-header h3 {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-primary);
  margin: 0;
  flex: 1;
  padding-right: 12px;
}

.xref-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  transition: color 0.15s;
  flex-shrink: 0;
}
.xref-modal-close:hover {
  color: var(--text-primary);
}

.xref-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.xref-modal-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.xref-modal-list li {
  margin: 0;
}

.xref-modal-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.15s;
  gap: 8px;
}
.xref-modal-link:hover {
  background: var(--bg-card-hover);
  color: var(--color-accent);
}

.xref-modal-link-title {
  font-size: 0.85rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.xref-modal-badge {
  font-size: 0.68rem;
  padding: 2px 8px;
  background: rgba(37,99,235,0.12);
  border: 1px solid rgba(37,99,235,0.25);
  border-radius: 4px;
  color: var(--color-accent2);
  flex-shrink: 0;
  white-space: nowrap;
}

.xref-modal-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
  font-size: 0.85rem;
}

.xref-modal-footer {
  padding: 12px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.xref-modal-viewpage {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--color-accent);
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.15s;
  text-decoration: none;
}
.xref-modal-viewpage:hover {
  background: var(--bg-card);
  border-color: var(--color-accent);
}

/* ─── Xref Scoped Search Result Preview ─────────────────────── */
.xref-scoped-result {
  flex-direction: column !important;
  align-items: flex-start !important;
  gap: 4px !important;
}
.xref-scoped-preview {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-all;
}
.xref-scoped-result .xref-modal-badge {
  align-self: flex-end;
}

/* ─── Main Content ──────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  margin-top: 52px;
  flex: 1;
  min-height: calc(100vh - 52px);
  display: flex;
  position: relative;
  transition: margin-left 0.3s ease;
}

/* ─── App Content Base ────────────────────────────────────── */
#app-content {
  width: 100%;
  box-sizing: border-box;
}

/* ─── Homepage Layout ─────────────────────────────────────── */
#app-content.homepage-layout {
  padding: 0;  /* sections handle their own padding */
}
#app-content.homepage-layout .section {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}
#app-content.homepage-layout .hero-section {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

/* ─── Content Layout: article + right-panel side by side ──── */
#app-content.content-layout {
  display: flex !important;
  flex-direction: row !important;
  align-items: flex-start;
  gap: 32px;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 32px;
  box-sizing: border-box;
}

#app-content.content-layout > .article {
  flex: 1 1 0% !important;
  min-width: 0;           /* prevent content overflow */
  max-width: none !important; /* override .article base max-width so text fills flex space */
}

#app-content.content-layout > .right-panel {
  width: 220px !important;
  min-width: 200px;
  flex-shrink: 0;
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 90px);
  overflow-y: auto;
  align-self: flex-start;
}

/* ─── Theme Toggle Button ──────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.82rem;
  transition: all 0.2s;
  width: 100%;
}
.theme-toggle:hover {
  background: var(--bg-card);
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.theme-toggle .icon-moon,
.theme-toggle .icon-sun {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ─── Help Button ────────────────────────────────────────────── */
.help-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.82rem;
  transition: all 0.2s;
  width: 100%;
  margin-top: 4px;
}
.help-btn:hover {
  background: var(--bg-card);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ─── Sidebar Version Badge ─────────────────────────────────────── */
.sidebar-version {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid var(--border);
  margin-bottom: 4px;
}
.sidebar-version:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.version-label { font-family: var(--font-mono, monospace); }

/* ─── Help Modal ─────────────────────────────────────────────── */
.help-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.help-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  max-width: 760px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,0.4);
  animation: helpModalIn 0.2s ease;
}
@keyframes helpModalIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1)    translateY(0);   }
}
.help-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.help-modal-header h2 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-primary);
}
.help-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  line-height: 1;
  transition: all 0.15s;
}
.help-modal-close:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}
.help-modal-body {
  overflow-y: auto;
  padding: 24px;
  flex: 1;
}
.help-content {
  line-height: 1.8;
  color: var(--text-primary);
}
.help-content h2 {
  font-size: 1rem;
  color: var(--color-accent);
  margin: 24px 0 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.help-content h3 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 16px 0 6px;
}
.help-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 12px 0;
}
.help-content th, .help-content td {
  padding: 6px 12px;
  border: 1px solid var(--border);
  text-align: left;
}
.help-content th {
  background: var(--bg-card);
  color: var(--text-secondary);
}
.help-content code {
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--color-accent);
}
.help-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  overflow-x: auto;
  font-size: 0.85em;
}
@media (max-width: 600px) {
  .help-modal { max-height: 95vh; }
  .help-modal-body { padding: 16px; }
}

/* ─── Home Page ─────────────────────────────────────────────── */
.home-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 32px 80px;
  width: 100%;
  animation: slideIn 0.5s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ── Hero Section ── */
.hero-section {
  text-align: center;
  padding: 64px 0 56px;
  position: relative;
}
.hero-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.hero-inner {
  max-width: 680px;
  margin: 0 auto;
}
.hero-eyebrow {
  font-size: 0.82rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-sans);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  line-height: 1.3;
}
.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  font-family: var(--font-serif);
  line-height: 1.7;
  margin-bottom: 32px;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-sans);
  line-height: 1.2;
}
.hero-stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.cta-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}
.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(37,99,235,0.4);
  color: #fff;
}
.cta-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--color-accent);
}
.cta-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-1px);
  color: var(--color-accent);
}

/* ── Entry Cards ── */
.entry-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.entry-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text-primary);
  transition: all 0.25s;
  position: relative;
  text-decoration: none;
}
.entry-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  color: var(--text-primary);
}
.entry-card-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}
.entry-card-body {
  flex: 1;
  min-width: 0;
}
.entry-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  color: var(--text-primary);
}
.entry-card-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.entry-card-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.72rem;
  padding: 3px 10px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.25);
  border-radius: 12px;
  color: var(--color-accent2);
  font-family: var(--font-sans);
  white-space: nowrap;
}

/* ── Home Quotes Grid ── */
.home-quotes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.home-quote-card {
  padding: 0 0 4px;
}

/* ── Quote Block (shared) ── */
.quote-block {
  border-left: 3px solid var(--color-accent);
  padding: 16px 24px;
  margin: 0 0 10px;
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(56,189,248,0.04));
  border-radius: 0 12px 12px 0;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-secondary);
  font-style: italic;
  position: relative;
}
.quote-block::before {
  content: '"';
  position: absolute;
  top: 8px;
  left: 10px;
  font-size: 2rem;
  color: var(--color-accent);
  opacity: 0.3;
  font-family: Georgia, serif;
  line-height: 1;
}
.quote-block p {
  margin: 0;
  padding-left: 16px;
}
.quote-source-link {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: right;
  padding: 0 8px;
  transition: color 0.2s;
}
a.quote-source-link:hover {
  color: var(--color-accent);
}

/* ── Recent Letters ── */
.recent-letters {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.recent-letter-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}
.recent-letter-item:hover {
  background: var(--bg-card);
  border-left-color: var(--color-accent);
  color: var(--color-accent);
}
.recent-letter-year {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-sans);
  min-width: 40px;
  font-weight: 600;
}
.recent-letter-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.recent-letter-cat {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(37,99,235,0.1);
  border-radius: 4px;
  color: var(--color-accent2);
  white-space: nowrap;
}

.section {
  margin-bottom: 48px;
}
.section-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

/* Quick Links */
.quick-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.quick-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.2s;
}
.quick-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* Timeline */
.timeline-legend {
  display: flex;
  gap: 20px;
  margin-bottom: 16px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.legend-item.partnership { color: #818CF8; }
.legend-item.shareholder { color: #2563EB; }

.timeline {
  position: relative;
  padding-left: 20px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-primary), transparent);
}

.timeline-decade {
  margin-bottom: 28px;
  position: relative;
}
.timeline-decade::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--bg-primary);
}

.timeline-decade-label {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-accent);
  margin-bottom: 10px;
  font-weight: 600;
}

.timeline-items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.timeline-item {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  transition: all 0.2s;
}
.timeline-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--color-accent);
}
.timeline-item.partnership {
  border-left: 2px solid #818CF8;
}
.timeline-item.shareholder {
  border-left: 2px solid var(--color-primary);
}

/* Concept Cloud */
.concept-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.concept-tag {
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(56,189,248,0.1));
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  transition: all 0.2s;
}
.concept-tag:hover {
  background: linear-gradient(135deg, rgba(37,99,235,0.3), rgba(56,189,248,0.2));
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

/* People Grid */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.person-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  transition: all 0.3s;
}
.person-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  border-color: var(--color-accent);
}
.person-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
  font-family: var(--font-serif);
}
.person-name {
  font-size: 0.85rem;
  text-align: center;
  color: var(--text-secondary);
}

/* ─── Article Page ──────────────────────────────────────────── */
.article {
  max-width: 800px;
  padding: 48px 24px 80px;
  flex: 1;
  animation: slideIn 0.5s ease;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}
.category-badge {
  padding: 4px 12px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.3);
  border-radius: 6px;
  font-size: 0.78rem;
  color: var(--color-accent2);
}
.year-badge {
  padding: 4px 10px;
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.2);
  border-radius: 6px;
  font-size: 0.78rem;
  color: var(--color-accent);
  font-family: var(--font-sans);
}

.article-title {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-primary);
  margin: 0 0 24px 0;
}

.article-body {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-primary);
}
.article-body h1 {
  font-size: 1.8rem;
  margin: 32px 0 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}
.article-body h2 {
  font-size: 1.4rem;
  margin: 32px 0 12px;
  color: var(--text-primary);
}
.article-body h3 {
  font-size: 1.15rem;
  margin: 24px 0 10px;
  color: var(--color-accent2);
}
.article-body h4 {
  font-size: 1rem;
  margin: 20px 0 8px;
  color: var(--text-secondary);
}
.article-body p {
  margin-bottom: 14px;
}
.article-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 12px 20px;
  margin: 16px 0;
  background: rgba(37,99,235,0.08);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-body blockquote p {
  margin-bottom: 8px;
}
.article-body blockquote p:last-child {
  margin-bottom: 0;
}
.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 14px;
}
.article-body li {
  margin-bottom: 6px;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.9rem;
}
.article-body th, .article-body td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
.article-body th {
  background: var(--bg-card);
  color: var(--color-accent2);
  font-weight: 600;
}
.article-body td {
  background: var(--bg-card);
}
.article-body strong {
  color: var(--color-accent2);
  font-weight: 600;
}
.article-body em {
  color: var(--text-secondary);
}
.article-body a {
  color: var(--color-accent);
  border-bottom: 1px dashed rgba(56,189,248,0.3);
}
.article-body a:hover {
  border-bottom-color: var(--color-accent);
}
.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}
.wiki-link {
  color: var(--color-accent2);
  background: rgba(96,165,250,0.1);
  padding: 1px 6px;
  border-radius: 4px;
}

/* TOC */
.toc {
  position: sticky;
  top: 40px;
  width: 220px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding: 20px 16px;
  margin-top: 48px;
  flex-shrink: 0;
}
.toc-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.toc ul {
  list-style: none;
}
.toc li {
  margin-bottom: 6px;
}
.toc li a {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: block;
  padding: 3px 0 3px 10px;
  border-left: 2px solid transparent;
  transition: all 0.15s;
}
.toc li a:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}
.toc-h3 a {
  padding-left: 22px !important;
  font-size: 0.75rem !important;
}
.toc-h1 a {
  font-weight: 500;
  color: var(--text-secondary);
}

/* ─── Right Panel (sticky TOC + xref, side by side with article) ──────── */
.right-panel {
  position: sticky;
  top: 40px;
  width: 220px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 48px;
  padding-bottom: 20px;
  align-self: flex-start;
}

/* TOC inside right-panel: no longer needs its own sticky/size — panel handles it */
.right-panel .toc {
  position: static;
  width: auto;
  max-height: none;
  overflow: visible;
  margin-top: 0;
  padding: 0;
}

/* ─── Cross-Reference Panel ─────────────────────────────────── */
.xref-panel {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

/* When xref-panel is the FIRST child (no TOC), remove the separator */
.right-panel > .xref-panel:first-child {
  border-top: none;
  padding-top: 0;
}

.xref-panel-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
}
.xref-group {
  margin-bottom: 16px;
}
.xref-group-label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}
.xref-chips {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.xref-chip {
  display: block;
  font-size: 0.75rem;
  color: var(--color-accent2);
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid rgba(96,165,250,0.2);
  background: rgba(96,165,250,0.05);
  text-decoration: none;
  transition: all 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.xref-chip:hover {
  background: rgba(96,165,250,0.15);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Xref letter list (entity pages) */
.xref-letter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.xref-letter-list li {
  margin: 0;
}
.xref-letter-item {
  display: block;
  font-size: 0.75rem;
  color: var(--color-accent2);
  padding: 5px 8px;
  border-radius: 4px;
  border: 1px solid rgba(96,165,250,0.15);
  background: rgba(96,165,250,0.03);
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.xref-letter-item:hover {
  background: rgba(96,165,250,0.12);
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.xref-letter-item::after {
  content: ' 🔍';
  font-size: 0.65rem;
  opacity: 0;
  transition: opacity 0.15s;
}
.xref-letter-item:hover::after {
  opacity: 1;
}

/* Backlinks */
.backlinks {
  margin-top: 40px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.backlinks h3 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.backlinks ul {
  list-style: none;
}
.backlinks li {
  margin-bottom: 6px;
}
.backlinks li a {
  font-size: 0.85rem;
  color: var(--color-accent2);
}

/* Content Nav */
.content-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.nav-prev, .nav-next {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: all 0.2s;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.nav-prev:hover, .nav-next:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ─── Category Index ────────────────────────────────────────── */
.category-index {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 32px;
  width: 100%;
  animation: slideIn 0.5s ease;
}
.category-index h1 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  margin-bottom: 8px;
}
.category-count {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 0.9rem;
}
.list-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: transparent;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}
.list-item:hover {
  background: var(--bg-card);
  border-left-color: var(--color-accent);
  color: var(--color-accent);
}
.list-year {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-sans);
  min-width: 40px;
}
.list-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ─── Enhanced Index Pages ──────────────────────────────────── */

/* Shared header */
.idx-header {
  margin-bottom: 28px;
}
.idx-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* Stats row */
.idx-stats {
  display: flex;
  gap: 24px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.idx-stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 24px;
  text-align: center;
  min-width: 110px;
}
.idx-stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-sans);
  line-height: 1.2;
}
.idx-stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Letter index: decade timeline ── */
.decade-timeline {
  display: flex;
  flex-direction: column;
  gap: 36px;
}
.decade-section {}
.decade-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.letter-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
}
.letter-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.18s;
}
.letter-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56,189,248,0.12);
}
.letter-card-year {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-sans);
  line-height: 1;
}
.letter-card-title {
  font-size: 0.78rem;
  color: var(--text-secondary);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.4;
}

/* ── Special Letters ── */
.special-card-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.special-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.18s;
}
.special-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateX(4px);
}
.special-card-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}
.special-card-body {
  flex: 1;
}
.special-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.special-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.special-card-arrow {
  color: var(--color-accent);
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform 0.18s;
}
.special-card:hover .special-card-arrow {
  transform: translateX(4px);
}

/* ── Concepts ── */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.tag-cloud-item {
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(56,189,248,0.1);
  color: var(--color-accent);
  font-size: 0.78rem;
  border: 1px solid rgba(56,189,248,0.2);
  cursor: default;
}
.tag-w1 { font-size: 0.72rem; opacity: 0.7; }
.tag-w2 { font-size: 0.82rem; opacity: 0.85; }
.tag-w3 { font-size: 0.92rem; opacity: 1; font-weight: 600; }

.concept-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.concept-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.18s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.concept-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56,189,248,0.1);
}
.concept-card-core {
  border-color: rgba(56,189,248,0.35);
}
.concept-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.concept-card-title {
  font-size: 0.95rem;
  font-weight: 600;
}
.concept-badge {
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(56,189,248,0.2);
  color: var(--color-accent);
  white-space: nowrap;
  flex-shrink: 0;
}
.concept-card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin: 0;
}
.concept-card-letters {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ── Companies ── */
.company-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.company-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.18s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.company-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56,189,248,0.1);
}
.company-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.company-card-name {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.3;
  flex: 1;
}
.company-rel-badge {
  font-size: 0.62rem;
  padding: 2px 7px;
  border-radius: 8px;
  background: rgba(96,165,250,0.15);
  color: var(--color-accent2);
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.6;
}
.company-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.company-tag {
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.company-card-footer {
  margin-top: auto;
}
.company-ext-link {
  font-size: 0.72rem;
  color: var(--color-accent);
  text-decoration: none;
  border: 1px solid rgba(56,189,248,0.25);
  border-radius: 6px;
  padding: 2px 8px;
  transition: all 0.15s;
}
.company-ext-link:hover {
  background: rgba(56,189,248,0.1);
}

/* ── People ── */
.person-card-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.person-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.18s;
}
.person-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(56,189,248,0.12);
}
.person-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  font-family: var(--font-serif);
}
.person-card-body {
  flex: 1;
  min-width: 0;
}
.person-card-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.person-card-role {
  font-size: 0.78rem;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.person-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin: 0 0 10px;
}
.person-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.person-tag {
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ── Responsive for index pages ── */
@media (max-width: 600px) {
  .idx-stats { gap: 12px; }
  .idx-stat { min-width: 80px; padding: 12px 16px; }
  .idx-stat-num { font-size: 1.2rem; }
  .letter-card-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
  .concept-card-grid { grid-template-columns: 1fr; }
  .company-card-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .person-card-list { grid-template-columns: 1fr; }
  .person-card { padding: 16px; }
}


.graph-page {
  flex-direction: column;
}
.graph-header {
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.graph-header h1 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
}
.graph-legend {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}
.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
}
.graph-container {
  flex: 1;
  min-height: 500px;
}
.graph-container svg {
  width: 100%;
  height: 100%;
}
.graph-tooltip {
  position: fixed;
  padding: 8px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-primary);
  pointer-events: none;
  display: none;
  z-index: 300;
  max-width: 200px;
}

/* ─── Talk Page ─────────────────────────────────────────────── */
.talk-page {
  flex-direction: column;
  /* Pin .main-content to the remaining viewport so the chat layout never
     overflows into a scrollable page — input area stays visible at bottom. */
  height: calc(100vh - 52px);
  overflow: hidden;
}
/* #app-content must fill the height-constrained .main-content flex container */
.talk-page #app-content {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.talk-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 100%;
  /* Use 100% of the constrained parent instead of 100vh, which does not
     respect the flex-parent height cap and causes the page to scroll. */
  height: 100%;
  min-height: 0;
}
.talk-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.talk-header h1 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
}
.talk-actions {
  display: flex;
  gap: 8px;
}
.talk-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
}
.talk-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.talk-body {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0; /* prevent flex children from overflowing on some browsers */
}

.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.chat-welcome {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}
.welcome-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin: 0 auto 16px;
  font-family: var(--font-serif);
}
.welcome-hint {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.welcome-disclaimer {
  margin-top: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.chat-message {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  animation: slideIn 0.3s ease;
}
.chat-message.user {
  flex-direction: row-reverse;
}
.msg-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}
.msg-avatar.ai {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
}
.msg-avatar.human {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
}
.msg-bubble {
  max-width: 70%;
  padding: 12px 18px;
  border-radius: 14px;
  font-size: 0.9rem;
  line-height: 1.7;
}
.chat-message.assistant .msg-bubble {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}
.chat-message.user .msg-bubble {
  background: rgba(37,99,235,0.2);
  border: 1px solid rgba(37,99,235,0.3);
  border-top-right-radius: 4px;
  color: var(--text-primary);
}

/* ── Markdown inside chat bubbles ── */
.msg-bubble p { margin: 0 0 0.6em; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3, .msg-bubble h4 {
  margin: 1em 0 0.4em;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
}
.msg-bubble h1 { font-size: 1.15em; }
.msg-bubble h2 { font-size: 1.08em; }
.msg-bubble h3 { font-size: 1.02em; }
.msg-bubble h4 { font-size: 0.95em; }
.msg-bubble h1:first-child, .msg-bubble h2:first-child,
.msg-bubble h3:first-child, .msg-bubble h4:first-child { margin-top: 0; }
.msg-bubble ul, .msg-bubble ol {
  margin: 0.4em 0 0.6em;
  padding-left: 1.5em;
}
.msg-bubble li { margin-bottom: 0.25em; }
.msg-bubble blockquote {
  margin: 0.5em 0;
  padding: 0.4em 0.8em;
  border-left: 3px solid var(--color-accent);
  background: rgba(56,189,248,0.06);
  border-radius: 4px;
  color: var(--text-secondary);
  font-style: italic;
}
.msg-bubble code {
  background: rgba(56,189,248,0.1);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'SFMono-Regular', Consolas, monospace;
}
.msg-bubble pre {
  margin: 0.5em 0;
  padding: 0.8em;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
}
.msg-bubble pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
}
.msg-bubble strong { font-weight: 600; color: var(--text-primary); }
.msg-bubble em { font-style: italic; }
.msg-bubble a, .msg-bubble a.chat-link {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-accent);
  transition: border-color 0.2s;
}
.msg-bubble a:hover, .msg-bubble a.chat-link:hover {
  border-bottom-style: solid;
}
.msg-bubble hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.8em 0;
}
.msg-bubble table {
  border-collapse: collapse;
  margin: 0.5em 0;
  font-size: 0.85em;
  width: 100%;
}
.msg-bubble th, .msg-bubble td {
  border: 1px solid var(--border);
  padding: 0.35em 0.6em;
  text-align: left;
}
.msg-bubble th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* ── Thinking / search indicator animation ── */
.thinking-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 0 6px;
  color: var(--text-muted);
  font-size: 0.84rem;
  animation: thinkingFadeIn 0.3s ease;
}
@keyframes thinkingFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.thinking-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-size: 1rem;
  animation: thinkingEmoji 2s steps(1) infinite;
  flex-shrink: 0;
}
@keyframes thinkingEmoji {
  0%   { content: '🔍'; }
  0%, 16.6%     { /* 🔍 */ }
  16.7%, 33.2%  { /* 🤔 */ }
  33.3%, 49.9%  { /* 📖 */ }
  50%, 66.5%    { /* 💡 */ }
  66.6%, 83.2%  { /* 📝 */ }
  83.3%, 100%   { /* 🔎 */ }
}
.thinking-text {
  animation: thinkingPulse 1.5s ease-in-out infinite;
}
@keyframes thinkingPulse {
  0%, 100% { opacity: 0.6; }
  50%      { opacity: 1; }
}
.thinking-dots {
  display: inline-flex;
  gap: 3px;
  align-items: center;
}
.thinking-dots span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: thinkingBounce 1.2s infinite ease-in-out;
}
.thinking-dots span:nth-child(2) { animation-delay: 0.2s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes thinkingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30%           { transform: translateY(-5px); opacity: 1; }
}

.chat-input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
}
.chat-input-area textarea {
  flex: 1;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.9rem;
  resize: none;
  outline: none;
  max-height: 120px;
  font-family: var(--font-sans);
}
.chat-input-area textarea:focus {
  border-color: var(--color-accent);
}
.send-btn {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border: none;
  border-radius: 10px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
  font-size: 0.9rem;
}
.send-btn:hover {
  opacity: 0.85;
}
.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Reference Panel */
.reference-panel {
  width: 320px;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.ref-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.ref-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.78rem;
  cursor: pointer;
}
.ref-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}
.ref-placeholder {
  color: var(--text-muted);
  font-size: 0.82rem;
  text-align: center;
  padding: 40px 0;
}
.ref-item {
  margin-bottom: 16px;
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.ref-item-title {
  font-size: 0.78rem;
  color: var(--color-accent2);
  margin-bottom: 6px;
}
.ref-item-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Settings Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}
.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  width: 90%;
  max-width: 440px;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.modal-header h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}
.settings-warning {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(56,189,248,0.08);
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 20px;
  line-height: 1.5;
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-group select,
.form-group input {
  width: 100%;
  padding: 9px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
}
.form-group select:focus,
.form-group input:focus {
  border-color: var(--color-accent);
}
.save-btn {
  width: 100%;
  padding: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border: none;
  border-radius: 8px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ─── Responsive ────────────────────────────────────────────── */

/* ── Tablet ── */
@media (max-width: 960px) {
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 0.95rem; }
  .entry-cards { grid-template-columns: repeat(2, 1fr); }
  #app-content.homepage-layout .section { padding-left: 28px; padding-right: 28px; }
  #app-content.homepage-layout .hero-section { padding-left: 28px; padding-right: 28px; }
  .home-container { padding-left: 24px; padding-right: 24px; }
  .concept-cloud { gap: 6px; }
  .company-card-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .person-card-list { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
  .category-index { padding: 40px 24px; }
  .quotes-page { padding: 40px 24px 60px; }
}

@media (max-width: 1100px) {
  .toc { display: none; }
  .right-panel,
  #app-content.content-layout > .right-panel {
    position: static !important;
    width: 100% !important;
    min-width: 0 !important;
    max-height: none !important;
    overflow: visible;
    margin-top: 24px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
  }
  .right-panel:not(:has(.xref-panel)) {
    display: none;
  }
  .right-panel .xref-chips {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .right-panel .xref-letter-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .reference-panel { width: 260px; }
  #app-content.content-layout {
    flex-direction: column !important;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 30px rgba(0,0,0,0.5);
  }
  .sidebar-close {
    display: block;
  }
  /* Hide desktop collapse controls on mobile */
  .sidebar-toggle,
  .sidebar-expand-btn {
    display: none !important;
  }
  /* Reset collapsed state on mobile — sidebar is always hidden by default */
  body.sidebar-collapsed .main-content {
    margin-left: 0;
  }
  body.sidebar-collapsed .site-header {
    left: 0;
  }
  .hamburger {
    display: block;
  }
  .main-content {
    margin-left: 0;
    margin-top: 0;
  }
  /* Header: simplified on mobile */
  .site-header {
    left: 0;
    padding: 10px 16px;
  }
  .search-kbd-hint {
    display: none;
  }
  .mobile-search-btn {
    display: block;
  }

  /* Homepage */
  .home-container {
    padding: 60px 20px 60px;
  }
  #app-content.homepage-layout .section { padding-left: 20px; padding-right: 20px; }
  #app-content.homepage-layout .hero-section { padding-left: 20px; padding-right: 20px; }
  .hero-section { padding: 48px 0 40px; }
  .hero-title { font-size: 2rem; }
  .hero-stats { gap: 20px; }
  .hero-stat-num { font-size: 1.5rem; }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .quick-links {
    grid-template-columns: 1fr;
  }
  .entry-cards {
    grid-template-columns: 1fr;
  }
  .entry-card { padding: 16px; }
  .entry-card-badge { font-size: 0.68rem; padding: 2px 8px; }
  .recent-letters { gap: 2px; }
  .recent-letter-item { padding: 10px 12px; gap: 10px; font-size: 0.85rem; }
  .home-quotes-grid { grid-template-columns: 1fr; }
  .concept-cloud { gap: 6px; }
  .concept-tag { padding: 5px 12px; font-size: 0.78rem; }
  .people-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
  }
  .person-card { padding: 16px 12px; }
  .person-avatar { width: 40px; height: 40px; font-size: 1rem; }
  .timeline-items { gap: 4px; }
  .timeline-item { padding: 3px 10px; font-size: 0.75rem; }

  /* Index pages */
  .category-index {
    padding: 60px 20px 40px;
  }
  .letter-card-grid { grid-template-columns: repeat(2, 1fr); }
  .concept-card-grid { grid-template-columns: 1fr; }
  .company-card-grid { grid-template-columns: repeat(2, 1fr); }
  .person-card-list { grid-template-columns: 1fr; }
  .person-card { padding: 16px; gap: 12px; }
  .idx-stats { gap: 10px; }
  .idx-stat { min-width: 80px; padding: 12px 16px; }
  .idx-stat-num { font-size: 1.3rem; }

  /* Quotes page */
  .quotes-page {
    padding: 60px 20px 60px;
  }
  .quotes-filters {
    flex-wrap: wrap;
    gap: 6px;
  }
  .quotes-filter-btn {
    padding: 6px 14px;
    font-size: 0.78rem;
  }
  .quote-block { padding: 14px 18px; }
  .quote-block p { padding-left: 12px; }

  /* Graph + Talk */
  .graph-header {
    padding: 16px 20px 16px 60px;
  }
  .graph-legend { gap: 8px; font-size: 0.72rem; flex-wrap: wrap; }
  .graph-container { min-height: 400px; }
  /* On mobile, margin-top is 0 so chat container fills full viewport */
  .talk-page {
    height: 100vh;
  }
  .talk-header {
    padding: 12px 16px 12px 60px;
  }
  .talk-header h1 { font-size: 1.1rem; }
  .chat-messages { padding: 16px; }

  /* Article */
  .article {
    padding: 60px 20px 60px;
  }
  #app-content.content-layout { padding: 60px 20px 40px; }
  .right-panel,
  #app-content.content-layout > .right-panel {
    padding: 16px;
    border-radius: 8px;
  }
  .reference-panel {
    display: none;
  }
}

/* ── Small mobile ── */
@media (max-width: 480px) {
  .hero-title { font-size: 1.7rem; }
  .hero-subtitle { font-size: 0.9rem; }
  .hero-stat-num { font-size: 1.3rem; }
  .hero-stats { gap: 16px; }
  .hero-eyebrow { font-size: 0.72rem; letter-spacing: 1px; }
  .cta-btn { padding: 10px 20px; font-size: 0.85rem; }
  .home-container { padding: 56px 16px 48px; }
  #app-content.homepage-layout .section { padding-left: 16px; padding-right: 16px; }
  #app-content.homepage-layout .hero-section { padding-left: 16px; padding-right: 16px; }
  .section-title { font-size: 1.2rem; }
  .entry-card-icon { font-size: 1.5rem; }
  .entry-card-title { font-size: 0.92rem; }
  .entry-card-desc { font-size: 0.78rem; }
  .letter-card-grid { grid-template-columns: 1fr; }
  .person-card-list { grid-template-columns: 1fr; }
  .company-card-grid { grid-template-columns: 1fr; }
  .category-index { padding: 56px 16px 36px; }
  .category-index h1 { font-size: 1.4rem; }
  .quotes-page { padding: 56px 16px 48px; }
  .quotes-header h1 { font-size: 1.4rem; }
  .quote-block { padding: 12px 14px; font-size: 0.88rem; }
  .quote-block::before { font-size: 1.5rem; top: 6px; left: 6px; }
  .quote-block p { padding-left: 10px; }
  .article { padding: 56px 16px 48px; }
  #app-content.content-layout { padding: 56px 16px 36px; }
  .idx-stat { min-width: 70px; padding: 10px 12px; }
  .idx-stat-num { font-size: 1.1rem; }
  .decade-label { font-size: 0.75rem; }
  .letter-card { padding: 12px 14px; }
  .recent-letter-item { padding: 8px 10px; gap: 8px; font-size: 0.82rem; }
  .recent-letter-cat { font-size: 0.68rem; padding: 2px 6px; }
  .graph-header { padding: 12px 16px 12px 52px; }
  .graph-header h1 { font-size: 1.2rem; }
  .talk-header { padding: 10px 12px 10px 52px; }
  .chat-messages { padding: 12px; }
  .people-grid { gap: 6px; }
  .person-card { padding: 14px 10px; }
  .person-name { font-size: 0.82rem; }
  .timeline-decade-label { font-size: 0.88rem; }
}

/* ── Fetch Models Button ── */
.model-fetch-row {
  margin-top: 8px;
}
.fetch-models-btn {
  font-size: 0.8rem;
  padding: 6px 12px;
  background: rgba(96, 165, 250, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: 6px;
  color: var(--color-accent2, #60A5FA);
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
}
.fetch-models-btn:hover {
  background: rgba(96, 165, 250, 0.2);
  border-color: var(--color-accent, #38BDF8);
}
.fetch-models-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
#model-select-wrap {
  margin-top: 8px;
}
#model-select-wrap select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-secondary, #0F2044);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.85rem;
}

/* ─── Quotes Page ──────────────────────────────────────────────── */
.quotes-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 32px 80px;
  width: 100%;
  animation: slideIn 0.5s ease;
}
.quotes-header {
  margin-bottom: 28px;
}
.quotes-header h1 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  margin-bottom: 8px;
}
.quotes-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}
.quotes-count {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-bottom: 20px;
}

/* Quotes Filter Tabs */
.quotes-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.quotes-filter-btn {
  padding: 7px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
}
.quotes-filter-btn:hover {
  background: var(--bg-card-hover);
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.quotes-filter-btn.active {
  background: rgba(37,99,235,0.15);
  border-color: var(--color-accent);
  color: var(--color-accent);
  font-weight: 600;
}

/* Quotes List */
.quotes-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.quote-item {
  animation: slideIn 0.3s ease;
}

/* ─── Article Quotes Section ───────────────────────────────────── */
.article-quotes {
  margin-top: 40px;
  padding: 28px 24px;
  background: linear-gradient(135deg, rgba(37,99,235,0.06), rgba(56,189,248,0.03));
  border: 1px solid var(--border);
  border-radius: 14px;
}
.article-quotes-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.article-quotes .quote-block {
  margin-bottom: 16px;
}
.article-quotes .quote-block:last-child {
  margin-bottom: 0;
}

/* ─── Sidebar Section Title ─────────────────────────────────────── */
.sidebar-section-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 12px 16px 4px;
  font-weight: 600;
}

/* ─── Reading Guide Page ─────────────────────────────────────────── */
#app-content.guide-layout {
  padding: 40px 40px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.guide-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.guide-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
}
.guide-list { display: flex; flex-direction: column; gap: 16px; }
.guide-item {
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.guide-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(56,189,248,0.08);
}
.guide-item-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}
.guide-year {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono, monospace);
  flex-shrink: 0;
}
.guide-item-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}
.guide-item-title:hover { text-decoration: underline; }
.guide-item-summary {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 768px) {
  #app-content.guide-layout { padding: 70px 20px 40px; }
}