:root {
  --color-bg: #faf8f3;
  --color-bg-card: #ffffff;
  --color-bg-hero: #f5f0e8;
  --color-header-bg: rgba(250, 248, 243, 0.95);
  --color-primary: #8B6914;
  --color-primary-hover: #6d5110;
  --color-primary-light: #c9a84c;
  --color-accent: #b8860b;
  --color-text: #2c2416;
  --color-text-muted: #7a6a50;
  --color-text-light: #a89878;
  --color-border: #e8dfc8;
  --color-border-light: #f0e8d8;
  --color-error-bg: #fdf5f5;
  --color-error-border: #e8a0a0;
  --color-error-text: #7a2020;
  --color-success: #4a7c59;
  --color-checkbox-bg: #ffffff;
  --font-serif: 'Lora', 'Georgia', serif;
  --font-sans: 'Nunito', system-ui, sans-serif;
  --font-scale: 1;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 4px rgba(44, 36, 22, 0.06);
  --shadow-md: 0 4px 16px rgba(44, 36, 22, 0.1);
  --shadow-lg: 0 12px 40px rgba(44, 36, 22, 0.12);
  --transition: 200ms ease;
}

[data-theme="dark"] {
  --color-bg: #141209;
  --color-bg-card: #1e1a10;
  --color-bg-hero: #191510;
  --color-header-bg: rgba(20, 18, 9, 0.96);
  --color-primary: #c9a84c;
  --color-primary-hover: #e0bc6a;
  --color-primary-light: #a88030;
  --color-accent: #c9a84c;
  --color-text: #f0e8d4;
  --color-text-muted: #b09870;
  --color-text-light: #7a6a50;
  --color-border: #2e2818;
  --color-border-light: #251f12;
  --color-error-bg: #2a1414;
  --color-error-border: #6a2a2a;
  --color-error-text: #e09090;
  --color-success: #5a9c6e;
  --color-checkbox-bg: #2a2418;
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 250ms ease, color 250ms ease;
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: var(--color-header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  min-width: 0;
}

.logo-icon {
  flex-shrink: 0;
  opacity: 0.9;
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.logo-main {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.2;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.logo-sub {
  font-size: 10px;
  font-weight: 300;
  color: var(--color-text-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  font-style: italic;
  font-family: var(--font-serif);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
  color: var(--color-text-muted);
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.theme-toggle:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-bg-hero);
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun  { display: none; }

[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }

/* Font size controls */
.font-size-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.font-size-btn {
  height: 34px;
  min-width: 34px;
  padding: 0 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.02em;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}

.font-size-btn:hover:not(:disabled) {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-bg-hero);
}

.font-size-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ============================================================
   MAIN LAYOUT
   ============================================================ */
.main-content {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  padding: 0 20px 60px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 40px 0 28px;
  text-align: center;
}

.hero-inner {
  max-width: 600px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 5vw, 48px);
  font-weight: 300;
  color: var(--color-text);
  line-height: 1.15;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 300;
  line-height: 1.7;
}

/* ============================================================
   SEARCH CARD
   ============================================================ */
.search-section {
  margin-bottom: 28px;
}

.search-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

/* Query area header & clear button */
.query-area-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.query-area-header .section-label {
  margin-bottom: 0;
}

.clear-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-light);
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}

.clear-btn:hover {
  background: var(--color-border);
  color: var(--color-text);
}

/* Books */
.books-grid {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.book-tile {
  display: block;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  flex: 1;
  min-width: 180px;
  position: relative;
}

.book-tile input[type="checkbox"],
.book-tile input[type="radio"] {
  display: none;
}

.book-open-btn {
  position: absolute;
  bottom: 8px;
  right: 8px;
  top: auto;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  border-radius: 50%;
  width: 24px;
  min-width: 24px;
  height: 24px;
  font-size: 12px;
  font-weight: 600;
  padding: 0;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.book-open-btn:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-bg-hero);
}

.book-tile-content {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: all var(--transition);
  background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg) 100%);
  box-shadow: var(--shadow-sm);
}

.book-tile:hover .book-tile-content,
.book-tile:active .book-tile-content {
  border-color: var(--color-primary-light);
  background: linear-gradient(180deg, var(--color-bg-hero) 0%, var(--color-bg) 100%);
  transform: translateY(-1px);
}

.book-tile input:checked + .book-tile-content {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(201, 168, 76, 0.2) 0%, rgba(201, 168, 76, 0.08) 100%);
  box-shadow: 0 8px 20px rgba(139, 105, 20, 0.18);
}

.book-tile input:checked + .book-tile-content .book-name {
  color: var(--color-primary);
  font-weight: 600;
}

.book-tile input:checked + .book-tile-content .book-size {
  color: var(--color-primary-hover);
}

.book-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  background: var(--color-bg);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  flex: 1;
  min-width: 140px;
}

.book-checkbox:hover,
.book-checkbox:active {
  border-color: var(--color-primary-light);
  background: var(--color-bg-hero);
}

.book-checkbox input[type="checkbox"] {
  display: none;
}

.book-checkbox-custom {
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  flex-shrink: 0;
  position: relative;
  transition: all var(--transition);
  background: var(--color-checkbox-bg);
}

.book-checkbox input:checked ~ .book-checkbox-custom {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.book-checkbox input:checked ~ .book-checkbox-custom::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 6px;
  height: 10px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.book-checkbox input:checked ~ .book-name {
  color: var(--color-primary);
}

.book-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.book-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text);
}

.book-size {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--color-text-light);
}

/* Question Input */
.question-input {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--color-text);
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
  outline: none;
  transition: border-color var(--transition);
  -webkit-appearance: none;
}

.question-input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(139, 105, 20, 0.08);
}

.question-input::placeholder {
  color: var(--color-text-light);
  font-style: italic;
}

/* Controls */
.search-controls {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.controls-left {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  flex: 1;
}

.analysis-estimate-wrap {
  min-width: 250px;
}

.filter-toggle-wrap {
  min-width: 220px;
  display: flex;
  flex-direction: column;
}

.filter-tooltip {
  margin-bottom: 8px;
  padding: 8px 10px;
  border: 1px solid var(--color-border-light);
  border-radius: 10px;
  background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg) 100%);
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.35;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.filter-tooltip::after {
  content: '';
  position: absolute;
  left: 14px;
  bottom: -6px;
  width: 10px;
  height: 10px;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  transform: rotate(45deg);
}

.filter-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  min-height: 40px;
  user-select: none;
}

.filter-toggle input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.filter-toggle-track {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--color-border);
  border: 1px solid var(--color-border-light);
  position: relative;
  flex-shrink: 0;
  transition: background-color var(--transition), border-color var(--transition);
}

.filter-toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-bg-card);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), background-color var(--transition);
}

.filter-toggle input[type="checkbox"]:checked + .filter-toggle-track {
  background: rgba(201, 168, 76, 0.28);
  border-color: var(--color-primary-light);
}

.filter-toggle input[type="checkbox"]:checked + .filter-toggle-track::after {
  transform: translateX(18px);
  background: var(--color-primary);
}

.filter-toggle-text {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.3;
}

.filter-toggle input[type="checkbox"]:checked + .filter-toggle-track + .filter-toggle-text {
  color: var(--color-primary);
}

.analysis-estimate {
  padding: 10px 12px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
}

.analysis-estimate-title {
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: 6px;
  font-weight: 500;
  font-style: italic;
}

.analysis-estimate-line {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.35;
  white-space: nowrap;
  font-style: italic;
}

.model-selector,
.top-n-selector {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.model-selector {
  min-width: 220px;
}

.model-select {
  background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg) 100%);
  border: 1px solid var(--color-border-light);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--color-text);
  cursor: pointer;
  outline: none;
  font-family: var(--font-sans);
  transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237a6a50' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
  min-height: 40px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.model-select:hover {
  border-color: var(--color-primary-light);
}

.model-select:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(139, 105, 20, 0.14);
}

[data-theme="dark"] .model-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23b09870' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Analyze Button */
.analyze-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  letter-spacing: 0.02em;
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.analyze-btn:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.analyze-btn:active:not(:disabled) {
  transform: translateY(0);
}

.analyze-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-icon {
  display: flex;
  align-items: center;
}

/* ============================================================
   LOADING
   ============================================================ */
.loading-section {
  text-align: center;
  padding: 48px 0;
}

.loading-inner {
  display: inline-block;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  position: relative;
}

.spinner-ring {
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.loading-subtext {
  font-size: 13px;
  color: var(--color-text-light);
  white-space: pre-line;
}

.loading-timer-row {
  margin-top: 16px;
}

.loading-timer {
  font-family: 'Courier New', 'Courier', monospace;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  opacity: 0.85;
  display: inline-block;
  min-width: 64px;
  text-align: center;
}

.cancel-btn {
  margin-top: 20px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.02em;
  -webkit-tap-highlight-color: transparent;
}

.cancel-btn:hover {
  border-color: #c05050;
  color: #c05050;
  background: rgba(192, 80, 80, 0.05);
}

/* ============================================================
   ERROR
   ============================================================ */
.error-section {
  margin-bottom: 24px;
}

.error-card {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.error-icon {
  font-size: 20px;
  flex-shrink: 0;
  color: #c05050;
  line-height: 1.5;
}

.error-text {
  flex: 1;
  font-size: 14px;
  color: var(--color-error-text);
  line-height: 1.5;
  min-width: 0;
}

.error-dismiss {
  background: none;
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 13px;
  color: var(--color-error-text);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  min-height: 36px;
  -webkit-tap-highlight-color: transparent;
}

.error-dismiss:hover {
  background: var(--color-error-border);
}

/* ============================================================
   RESULT
   ============================================================ */
.result-section {
  margin-bottom: 40px;
}

.result-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}

.result-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border-light);
  flex-wrap: wrap;
}

.result-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 400;
  color: var(--color-text);
}

.tree-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tree-action-btn {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 10px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.tree-action-btn-icon {
  width: 34px;
  min-width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 10px;
  font-size: 16px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.tree-action-btn:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-bg-hero);
}

.tree-action-btn.active {
  border-color: #7aa7d6;
  color: #4f76a3;
  background: rgba(95, 169, 243, 0.2);
}

.result-meta {
  font-size: 12px;
  color: var(--color-text-light);
  letter-spacing: 0.04em;
}

.result-notices {
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-notice {
  border: 1px solid var(--color-primary-light);
  background: rgba(201, 168, 76, 0.12);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.5;
}

.result-answer {
  font-family: var(--font-serif);
  font-size: calc(17px * var(--font-scale));
  line-height: 1.85;
  color: var(--color-text);
}

.result-answer h1, .result-answer h2, .result-answer h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-primary);
  margin: 20px 0 10px;
  line-height: 1.3;
}

.result-answer h1 { font-size: calc(24px * var(--font-scale)); }
.result-answer h2 { font-size: calc(21px * var(--font-scale)); }
.result-answer h3 { font-size: calc(18px * var(--font-scale)); }

.result-answer p {
  margin-bottom: 14px;
}

.result-answer strong, .result-answer b {
  font-weight: 600;
  color: var(--color-text);
}

.result-answer em, .result-answer i {
  font-style: italic;
  color: var(--color-text-muted);
}

.result-answer ul, .result-answer ol {
  padding-left: 24px;
  margin-bottom: 14px;
}

.result-answer li {
  margin-bottom: 6px;
}

.result-divider {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: 14px 0 18px;
}

.result-quote {
  margin: 14px 0;
  padding: 12px 14px;
  border-left: 3px solid var(--color-primary-light);
  background: var(--color-bg-hero);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.result-quote p {
  margin-bottom: 0;
  color: var(--color-text);
  font-style: italic;
}

.scripture-ref {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 3px;
  padding: 2px 8px;
  border: 1px solid var(--color-primary-light);
  border-radius: 999px;
  background: rgba(201, 168, 76, 0.12);
  color: var(--color-primary);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.82em;
  line-height: 1.35;
  vertical-align: baseline;
  transition: all var(--transition);
}

.scripture-ref:hover {
  background: rgba(201, 168, 76, 0.2);
  border-color: var(--color-primary);
}

.scripture-ref-commentary {
  border-style: dashed;
}

.result-answer code {
  font-family: 'Courier New', 'Courier', monospace;
  font-size: 0.88em;
  background: var(--color-bg-hero);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 5px;
}

/* Sources */
.sources-section {
  margin-top: 8px;
}

.sources-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 16px;
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.source-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), outline-color var(--transition);
}

.source-card:hover {
  box-shadow: var(--shadow-md);
}

.source-card.expanded {
  border-color: var(--color-primary-light);
  outline: 2px solid rgba(201, 168, 76, 0.35);
  outline-offset: 0;
}

.source-card.source-card-selected {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(201, 168, 76, 0.25);
}

.source-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.source-badge {
  background: var(--color-bg-hero);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  white-space: nowrap;
  flex-shrink: 0;
}

.source-text-preview {
  flex: 1;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  min-width: 0;
}

.source-toggle {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--color-text-light);
  font-size: 10px;
}

.source-open-browser-btn {
  flex-shrink: 0;
  width: auto;
  height: 26px;
  min-width: 64px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  padding: 0 10px;
}

.source-open-browser-btn:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: var(--color-bg-hero);
}

.source-context-menu {
  position: fixed;
  z-index: 1200;
  min-width: 260px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.source-context-item {
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--color-text);
  text-align: left;
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 8px 10px;
  cursor: pointer;
}

.source-context-item:hover {
  background: var(--color-bg-hero);
  color: var(--color-primary);
}

.source-card.expanded .source-toggle {
  transform: rotate(180deg);
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

.source-body {
  display: none;
  padding: 0 16px 16px;
  border-top: 1px solid var(--color-border-light);
}

.source-card.expanded .source-body {
  display: block;
}

.source-full-text {
  font-family: var(--font-serif);
  font-size: calc(16px * var(--font-scale));
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 14px;
  padding-top: 14px;
}

.source-sanskrit {
  font-size: 13px;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 10px;
  padding: 8px 12px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--color-primary-light);
}

.source-word-for-word {
  font-size: calc(14px * var(--font-scale));
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 10px;
  padding: 10px 12px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--color-primary-light);
}

.source-word-for-word-title {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.source-commentary-toggle {
  font-size: 13px;
  color: var(--color-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  border: none;
  background: none;
  padding: 4px 0;
  font-family: var(--font-sans);
  min-height: 36px;
  -webkit-tap-highlight-color: transparent;
}

.source-commentary-toggle:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.source-commentary {
  font-size: calc(14px * var(--font-scale));
  color: var(--color-text-muted);
  line-height: 1.75;
  padding: 12px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  margin-top: 4px;
  font-family: var(--font-sans);
  display: none;
}

.source-commentary.visible {
  display: block;
}

/* ============================================================
   EXAMPLES
   ============================================================ */
.examples-section {
  padding: 28px 0;
  border-top: 1px solid var(--color-border-light);
}

.examples-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 10px;
}

.example-btn {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-text-muted);
  cursor: pointer;
  line-height: 1.5;
  transition: all var(--transition);
  min-height: 56px;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.example-btn:hover,
.example-btn:active {
  border-color: var(--color-primary-light);
  color: var(--color-text);
  background: var(--color-bg-hero);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 20px;
  background: var(--color-bg-hero);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.footer-text {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.footer-quote {
  font-family: var(--font-serif);
  font-size: 15px;
  font-style: italic;
  color: var(--color-text-muted);
}

/* ============================================================
   UTILITIES
   ============================================================ */
.hidden {
  display: none !important;
}

/* ============================================================
   RESPONSIVE — tablet
   ============================================================ */
@media (max-width: 640px) {
  .header-inner {
    padding: 10px 16px;
  }

  .logo-icon svg {
    width: 26px;
    height: 26px;
  }

  .logo-main {
    font-size: 18px;
  }

  .nav-hint {
    display: none;
  }

  .main-content {
    padding: 0 12px 40px;
  }

  .hero {
    padding: 24px 0 20px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .search-card {
    padding: 16px;
    gap: 16px;
    border-radius: var(--radius-md);
  }

  .books-grid {
    gap: 8px;
  }

  .book-tile {
    min-width: 0;
  }

  .book-tile-content {
    padding: 13px 14px;
  }

  .book-checkbox {
    padding: 12px 14px;
    min-width: 0;
  }

  .book-name {
    font-size: 15px;
  }

  .question-input {
    font-size: 16px;
    min-height: 90px;
    padding: 12px 14px;
  }

  .search-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .controls-left {
    flex-direction: column;
    gap: 8px;
  }

  .analysis-estimate-wrap {
    min-width: 0;
    width: 100%;
  }

  .model-select {
    width: 100%;
    font-size: 14px;
    padding: 11px 32px 11px 12px;
  }

  .analyze-btn {
    width: 100%;
    padding: 14px 20px;
    font-size: 16px;
    min-height: 50px;
  }

  .result-card {
    padding: 18px 14px;
    border-radius: var(--radius-md);
  }

  .result-header {
    margin-bottom: 14px;
    padding-bottom: 12px;
  }

  .result-title {
    font-size: 20px;
  }

  .result-answer {
    font-size: 16px;
    line-height: 1.75;
  }

  .result-answer h1 { font-size: 20px; }
  .result-answer h2 { font-size: 18px; }
  .result-answer h3 { font-size: 16px; }

  .sources-title {
    font-size: 19px;
  }

  .source-header {
    padding: 12px 12px;
    gap: 10px;
  }

  .source-text-preview {
    font-size: 14px;
    -webkit-line-clamp: 1;
  }

  .source-full-text {
    font-size: 15px;
  }

  .source-body {
    padding: 0 12px 14px;
  }

  .examples-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .example-btn {
    font-size: 14px;
    padding: 12px 14px;
  }

  .error-card {
    padding: 14px 16px;
  }

  .loading-section {
    padding: 32px 0;
  }

  .loading-text {
    font-size: 16px;
  }

  .footer-quote {
    font-size: 13px;
  }
}

/* ============================================================
   QUERY STATS
   ============================================================ */
.query-stats {
  margin-top: 12px;
  margin-bottom: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
}

.query-stats-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 14px;
}

.qs-sections {
  display: flex;
  gap: 0;
  flex-direction: column;
}

.qs-section {
  flex: 1;
}

.qs-section-title {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.qs-divider {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: 14px 0;
}

.qs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px 16px;
}

.qs-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.qs-label {
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--color-text-muted);
}

.qs-value {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 600px) {
  .qs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   RESPONSIVE — small phones
   ============================================================ */
@media (max-width: 380px) {
  .logo-icon {
    display: none;
  }

  .logo-main {
    font-size: 17px;
  }

  .hero-title {
    font-size: 24px;
  }

  .search-card {
    padding: 14px 12px;
  }

  .books-grid {
    flex-direction: column;
  }

  .book-tile {
    width: 100%;
  }

  .book-checkbox {
    width: 100%;
  }

  .result-card {
    padding: 14px 12px;
  }
}

/* ============================================================
   SCRIPTURE BROWSER PAGE
   ============================================================ */
.back-link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 14px;
}

.back-link:hover {
  text-decoration: underline;
}

.scripture-browser-page {
  padding-top: 20px;
}

.advanced-search-panel {
  border-top: 1px solid var(--color-border-light);
  padding-top: 14px;
}

.question-input.single-line {
  min-height: 0;
  height: 46px;
  resize: none;
  font-family: var(--font-sans);
  font-size: 15px;
}

.advanced-options {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

.advanced-options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 13px;
}

.advanced-options label.hidden {
  display: none;
}

.advanced-options .sb-check {
  gap: 8px;
}

.advanced-options .sb-check input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  margin: 0;
  display: inline-grid;
  place-content: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.advanced-options .sb-check input[type="checkbox"]::before {
  content: '';
  width: 9px;
  height: 9px;
  border-radius: 2px;
  transform: scale(0);
  transition: transform var(--transition);
  background: #5fa9f3;
}

.advanced-options .sb-check input[type="checkbox"]:checked {
  border-color: #7aa7d6;
  background: rgba(95, 169, 243, 0.12);
  box-shadow: 0 0 0 2px rgba(95, 169, 243, 0.16);
}

.advanced-options .sb-check input[type="checkbox"]:checked::before {
  transform: scale(1);
}

.advanced-options input[type="number"] {
  width: 70px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  padding: 6px;
}

.search-meta {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.scripture-tree {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scripture-book,
.scripture-chapter,
.scripture-verse,
.scripture-subsection,
.scripture-section-node {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 8px 10px;
  background: var(--color-bg-card);
}

.scripture-book > summary,
.scripture-chapter > summary,
.scripture-verse > summary,
.scripture-subsection > summary,
.scripture-section-node > summary {
  cursor: pointer;
  user-select: none;
}

.scripture-book > summary,
.scripture-chapter > summary,
.scripture-section-node > summary {
  font-family: var(--font-serif);
  color: var(--color-primary);
}

.scripture-chapter > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.scripture-chapter-title {
  flex: 1 1 auto;
  min-width: 0;
}

.scripture-chapter-count {
  flex: 0 0 auto;
  margin-left: 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-style: italic;
  font-weight: 500;
  color: #4f76a3;
  background: rgba(95, 169, 243, 0.16);
  border: 1px solid rgba(95, 169, 243, 0.35);
  border-radius: 999px;
  padding: 2px 8px;
  line-height: 1.3;
  white-space: nowrap;
}

.scripture-section-node {
  margin-left: calc(var(--sb-level, 0) * 14px);
}

.scripture-section-node > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
}

.scripture-verse > summary {
  color: #5fa9f3;
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.scripture-verse-summary-main {
  min-width: 0;
  flex: 1 1 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.scripture-verse-ref {
  flex: 0 0 auto;
  font-weight: 600;
}

.scripture-verse-preview {
  display: none;
  min-width: 0;
  max-width: 100%;
  color: #8b5a2b;
  font-style: italic;
}

.scripture-verse:not([open]) > summary .scripture-verse-preview {
  display: inline-flex;
  align-items: baseline;
  max-width: calc(100% - 90px);
}

.scripture-verse-preview::before {
  content: '"';
  margin-right: 2px;
}

.scripture-verse-preview::after {
  content: '"';
  margin-left: 2px;
}

.scripture-verse-preview-text {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.scripture-star-btn {
  margin-left: auto;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text-light);
  width: 24px;
  min-width: 24px;
  height: 24px;
  line-height: 1;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.scripture-star-btn:hover {
  border-color: #d5b562;
  color: #c29c3a;
  background: rgba(201, 168, 76, 0.14);
  transform: translateY(-1px);
}

.scripture-star-btn.active {
  border-color: #d5b562;
  color: #b88a1f;
  background: rgba(201, 168, 76, 0.26);
}

.scripture-verse-body {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scripture-subsection > div {
  margin-top: 6px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.scripture-section {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 12px;
}

.scripture-section-text {
  background: linear-gradient(180deg, rgba(44, 36, 22, 0.07) 0%, rgba(44, 36, 22, 0.03) 100%);
}

.scripture-section-sanskrit {
  background: linear-gradient(180deg, rgba(201, 168, 76, 0.12) 0%, rgba(201, 168, 76, 0.05) 100%);
}

.scripture-section-word {
  background: linear-gradient(180deg, rgba(74, 124, 89, 0.15) 0%, rgba(74, 124, 89, 0.06) 100%);
}

.scripture-section-title {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  font-weight: 700;
}

.scripture-section-content {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}

.scripture-word-content .wf-row {
  line-height: 1.7;
  margin-bottom: 4px;
}

.scripture-word-content .wf-row:last-child {
  margin-bottom: 0;
}

.wf-sanskrit {
  color: var(--color-primary);
  font-weight: 600;
}

.wf-sep {
  color: var(--color-text-muted);
}

.wf-translation {
  color: var(--color-text);
}

.wf-plain {
  color: var(--color-text);
}

.scripture-commentary {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0;
  background: linear-gradient(180deg, rgba(122, 106, 80, 0.14) 0%, rgba(122, 106, 80, 0.05) 100%);
  overflow: hidden;
}

.scripture-commentary > summary {
  cursor: pointer;
  user-select: none;
  color: var(--color-text);
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.scripture-commentary > summary::-webkit-details-marker {
  display: none;
}

.scripture-commentary > summary::before {
  content: '▶';
  font-size: 11px;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.scripture-commentary[open] > summary::before {
  transform: rotate(90deg);
}

.scripture-commentary[open] > summary {
  border-bottom: 1px solid var(--color-border-light);
  background: rgba(201, 168, 76, 0.08);
}

.scripture-commentary > .scripture-section-content {
  margin-top: 0;
  padding: 10px 12px 12px;
}

.source-card .search-highlight {
  background: rgba(201, 168, 76, 0.5);
}

.scripture-verses {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scripture-chapters {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scripture-verse.targeted {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(201, 168, 76, 0.35);
}

.search-highlight {
  background: rgba(201, 168, 76, 0.38);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}