/* =========================================================
   OBG Guideline Hub - Main Stylesheet (Section-Ready)
   File: css/main.css
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; min-height: 100vh; -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; }
img, svg { max-width: 100%; display: block; }
button, input, textarea { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }

:root {
  --primary-blue: #1A56DB;
  --primary-dark: #1E3A5F;
  --primary-purple: #6B2C7D;
  --primary-purple-light: #8B3A9C;
  --accent-teal: #0E9F9F;
  --bookmark-active: #F59E0B;
  --note-active: #2563EB;
  --critical-red: #DC2626;
  --warning-orange: #F59E0B;
  --caution-yellow: #FBBF24;
  --normal-green: #10B981;
  --info-blue: #2563EB;
  --app-bg: #F8FAFC;
  --card-bg: #FFFFFF;
  --section-bg: #F1F5F9;
  --section-bg-purple: #F5F0F8;
  --border-color: #E2E8F0;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --status-trial: #1A56DB;
  --status-warning: #D97706;
  --status-expired: #DC2626;
  --status-active: #059669;
  --hl-yellow: #FEF9C3;
  --hl-green: #DCFCE7;
  --hl-pink: #FCE7F3;
  --top-nav-height: 56px;
  --bottom-nav-height: 64px;
  --content-padding: 16px;
  --fs-body: 16px;
  --fs-term: 16px;
  --fs-heading: 20px;
}

body.dark {
  --primary-blue: #3B82F6;
  --primary-dark: #0F172A;
  --primary-purple: #B084CC;
  --primary-purple-light: #C9A3DC;
  --accent-teal: #14B8A6;
  --bookmark-active: #FBBF24;
  --note-active: #60A5FA;
  --critical-red: #F87171;
  --warning-orange: #FBBF24;
  --caution-yellow: #FDE047;
  --normal-green: #34D399;
  --info-blue: #60A5FA;
  --app-bg: #0B1220;
  --card-bg: #1A2436;
  --section-bg: #232E42;
  --section-bg-purple: #2A1F35;
  --border-color: #2C3A52;
  --text-primary: #E8ECF4;
  --text-secondary: #B0BCD0;
  --text-muted: #7A8AA6;
  --hl-yellow: #4A3F1F;
  --hl-green: #1F4A33;
  --hl-pink: #4A1F35;
}

body.font-small { --fs-body: 15px; --fs-term: 15px; --fs-heading: 19px; }
body.font-large { --fs-body: 18px; --fs-term: 18px; --fs-heading: 22px; }

body, .top-nav, .bottom-nav, .card, .chapter-bar, .section-bar, .guideline-card, .auth-card, .form-input, .search-input, .btn, .term-row, .key-number-card, .reader-tab, .section-heading, .trial-badge, .compare-row, .stat-card, .modal-box, .reader-top-nav, .pin-screen, .chapter-table, .action-btn, .filter-tab, .bookmark-card, .note-card { transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease; }

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif; font-size: var(--fs-body); line-height: 1.6; color: var(--text-primary); background-color: var(--app-bg); overflow-x: hidden; }
h1, h2, h3 { color: var(--primary-dark); font-weight: 600; line-height: 1.3; }
body.dark h1, body.dark h2, body.dark h3 { color: var(--text-primary); }

/* ---------- Top / Bottom Nav ---------- */
.top-nav { position: fixed; top: 0; left: 0; right: 0; height: var(--top-nav-height); background-color: var(--primary-dark); display: flex; align-items: center; justify-content: space-between; padding: 0 16px; z-index: 100; padding-top: env(safe-area-inset-top); }
body.dark .top-nav { background-color: #050B17; border-bottom: 1px solid var(--border-color); }
.top-nav-title { color: #FFFFFF; font-size: 18px; font-weight: 600; cursor: pointer; -webkit-user-select: none; user-select: none; }
.top-nav-actions { display: flex; gap: 16px; align-items: center; }
.top-nav-icon { width: 24px; height: 24px; color: #FFFFFF; opacity: 0.9; cursor: pointer; }

.bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; height: var(--bottom-nav-height); background-color: var(--card-bg); border-top: 1px solid var(--border-color); display: flex; justify-content: space-around; align-items: center; z-index: 100; padding-bottom: env(safe-area-inset-bottom); }
.bottom-nav-item { display: flex; flex-direction: column; align-items: center; gap: 4px; color: var(--text-muted); font-size: 11px; font-weight: 500; padding: 8px 12px; min-width: 44px; min-height: 44px; justify-content: center; }
.bottom-nav-item.active { color: var(--accent-teal); }
.bottom-nav-icon { width: 24px; height: 24px; }

.main-content { padding-top: calc(var(--top-nav-height) + 16px); padding-bottom: calc(var(--bottom-nav-height) + 16px); padding-left: var(--content-padding); padding-right: var(--content-padding); min-height: 100vh; }
.full-page { min-height: 100vh; padding: 32px var(--content-padding); display: flex; flex-direction: column; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; height: 52px; padding: 0 24px; border-radius: 10px; font-size: 15px; font-weight: 600; transition: transform 0.1s ease, opacity 0.15s ease; width: 100%; }
.btn:active { transform: scale(0.97); }
.btn-primary { background-color: var(--primary-blue); color: #FFFFFF; }
.btn-secondary { background-color: transparent; color: var(--primary-blue); border: 1.5px solid var(--primary-blue); }
.btn-danger { background-color: var(--status-expired); color: #FFFFFF; }
.btn-ghost { background-color: var(--section-bg); color: var(--text-primary); height: 44px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.form-input, .form-select { width: 100%; height: 52px; padding: 0 16px; border: 1.5px solid var(--border-color); border-radius: 10px; background-color: var(--card-bg); color: var(--text-primary); font-size: 16px; -webkit-appearance: none; appearance: none; }
.form-input:focus, .form-select:focus { outline: none; border-color: var(--primary-blue); }
.form-error { font-size: 13px; color: var(--status-expired); margin-top: 6px; min-height: 18px; }
.form-success { font-size: 13px; color: var(--status-active); margin-top: 6px; min-height: 18px; }

/* ---------- Auth ---------- */
.auth-container { width: 100%; max-width: 420px; margin: 0 auto; padding-top: 40px; }
.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo-title { font-size: 22px; font-weight: 700; color: var(--primary-dark); margin-bottom: 6px; }
body.dark .auth-logo-title { color: var(--text-primary); }
.auth-logo-tagline { font-size: 14px; color: var(--text-muted); }
.auth-card { background-color: var(--card-bg); border-radius: 16px; padding: 24px; border: 1px solid var(--border-color); }
.auth-card-title { font-size: 20px; font-weight: 600; color: var(--text-primary); margin-bottom: 20px; text-align: center; }
.auth-toggle { text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-secondary); }
.auth-toggle a { color: var(--primary-blue); font-weight: 600; cursor: pointer; }

/* ---------- Cards (generic) ---------- */
.card { background-color: var(--card-bg); border-radius: 12px; border: 1px solid var(--border-color); padding: 16px; margin-bottom: 12px; }

/* =========================================================
   NEW: Section + Chapter Bars (Home Screen)
   ========================================================= */

.section-bar {
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
  color: #FFFFFF;
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 8px;
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  box-shadow: 0 2px 6px rgba(107, 44, 125, 0.2);
}

.section-bar:first-of-type { margin-top: 0; }

.section-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.section-bar-num {
  flex-shrink: 0;
  background-color: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.section-bar-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.section-bar-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.section-bar.collapsed .section-bar-toggle {
  transform: rotate(-90deg);
}

/* Empty section: dim the appearance slightly to differentiate */
.section-bar.section-empty {
  opacity: 0.7;
  background: linear-gradient(135deg, var(--primary-purple-light), var(--primary-purple));
}
.section-bar.section-empty:hover { opacity: 0.85; }
.section-bar.section-empty .section-bar-count {
  background-color: rgba(255,255,255,0.1);
  opacity: 0.7;
}

/* Empty section message inside */
.section-empty-message {
  padding: 14px 18px;
  margin: 4px 0 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background-color: var(--section-bg);
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  text-align: center;
  font-style: italic;
}

.section-bar-count {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  opacity: 0.85;
  background-color: rgba(255, 255, 255, 0.15);
  padding: 2px 8px;
  border-radius: 10px;
  margin-right: 8px;
}

.section-chapters {
  overflow: hidden;
  max-height: 4000px;
  transition: max-height 0.3s ease;
}

.section-chapters.hidden-collapse {
  max-height: 0;
}

.chapter-bar {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  position: relative;
  margin-left: 12px;
}

.chapter-bar:active {
  background-color: var(--section-bg);
  transform: scale(0.99);
}

.chapter-bar-num {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-purple);
  background-color: var(--section-bg-purple);
  padding: 3px 8px;
  border-radius: 12px;
  letter-spacing: 0.02em;
  min-width: 32px;
  text-align: center;
}

.chapter-bar-content {
  flex: 1;
  min-width: 0;
}

.chapter-bar-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.chapter-bar-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-bar-arrow {
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 700;
}

.ungrouped-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 16px 0 8px 0;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border-color);
}

/* ---------- Search ---------- */
.search-wrapper { position: relative; margin-bottom: 12px; }
.search-input { width: 100%; height: 48px; padding: 0 16px 0 44px; border: 1px solid var(--border-color); border-radius: 12px; background-color: var(--card-bg); color: var(--text-primary); font-size: 15px; -webkit-appearance: none; appearance: none; }
.search-input:focus { outline: none; border-color: var(--primary-blue); }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 20px; height: 20px; color: var(--text-muted); pointer-events: none; }

/* ---------- Trial Badge ---------- */
.trial-badge { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; font-weight: 600; cursor: pointer; }
.trial-badge.status-trial { background-color: #EFF6FF; color: var(--status-trial); border: 1px solid #BFDBFE; }
.trial-badge.status-warning { background-color: #FFFBEB; color: var(--status-warning); border: 1px solid #FDE68A; }
.trial-badge.status-expired { background-color: #FEF2F2; color: var(--status-expired); border: 1px solid #FECACA; }
.trial-badge.status-active { background-color: #ECFDF5; color: var(--status-active); border: 1px solid #A7F3D0; }
body.dark .trial-badge.status-trial { background-color: #1E3A5F; color: #93C5FD; border-color: #2D4A6F; }
body.dark .trial-badge.status-warning { background-color: #3F2E0F; color: #FCD34D; border-color: #5C432E; }
body.dark .trial-badge.status-expired { background-color: #3F1E1E; color: #FCA5A5; border-color: #5C2D2D; }
body.dark .trial-badge.status-active { background-color: #1E3F2E; color: #6EE7B7; border-color: #2D5C45; }

/* ---------- Section heading legacy (Guidelines/Compare) ---------- */
.section-heading { background-color: var(--section-bg); padding: 8px 16px; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-secondary); margin: 0 -16px 0 -16px; }

/* ---------- Term-row (legacy fallback) ---------- */
.term-row { padding: 14px 0; border-bottom: 1px solid var(--border-color); }
.term-row .term { font-size: var(--fs-term); font-weight: 600; color: var(--primary-dark); margin-bottom: 4px; }
body.dark .term-row .term { color: var(--text-primary); }
.term-row .definition { font-size: var(--fs-body); font-weight: 400; color: var(--text-primary); line-height: 1.6; }
.term-row.highlight-yellow { background-color: var(--hl-yellow); border-radius: 6px; padding: 14px 8px; margin: 4px -8px; }
.term-row.highlight-green  { background-color: var(--hl-green); border-radius: 6px; padding: 14px 8px; margin: 4px -8px; }
.term-row.highlight-pink   { background-color: var(--hl-pink); border-radius: 6px; padding: 14px 8px; margin: 4px -8px; }

/* ---------- Key Numbers ---------- */
.key-numbers-row { display: flex; gap: 12px; overflow-x: auto; padding: 4px 0 16px 0; margin: 0 -16px; padding-left: 16px; padding-right: 16px; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.key-numbers-row::-webkit-scrollbar { display: none; }
.key-number-card { flex: 0 0 auto; min-width: 130px; max-width: 170px; background: linear-gradient(135deg, var(--card-bg), var(--section-bg)); border: 1px solid var(--border-color); border-radius: 10px; padding: 14px 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.04); }
.key-number-value { font-size: 22px; font-weight: 700; color: var(--accent-teal); line-height: 1.2; margin-bottom: 4px; }
.key-number-label { font-size: 12px; font-weight: 500; color: var(--text-secondary); line-height: 1.4; }

/* ---------- Guideline Badges ---------- */
.badge { display: inline-block; padding: 4px 10px; border-radius: 4px; font-size: 11px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; border: 1px solid transparent; }
.badge-FOGSI { background-color: #FEF3C7; color: #92400E; border-color: #F59E0B; }
.badge-ACOG  { background-color: #F5F3FF; color: #5B21B6; border-color: #8B5CF6; }
.badge-NICE  { background-color: #EFF6FF; color: #1E40AF; border-color: #3B82F6; }
.badge-WHO   { background-color: #F0FDF4; color: #14532D; border-color: #22C55E; }
.badge-RCOG  { background-color: #F0FDFA; color: #134E4A; border-color: #14B8A6; }
.badge-FIGO  { background-color: #FEF2F2; color: #7F1D1D; border-color: #EF4444; }
.badge-ICOG  { background-color: #FFFBEB; color: #78350F; border-color: #F59E0B; }
.badge-ADA   { background-color: #FEE2E2; color: #991B1B; border-color: #EF4444; }
.badge-DIPSI { background-color: #FCE7F3; color: #831843; border-color: #EC4899; }

/* ---------- Reader Tabs ---------- */
.reader-tabs { position: sticky; top: var(--top-nav-height); background-color: var(--app-bg); display: flex; gap: 6px; padding: 12px 0; margin: 0 -16px; padding-left: 16px; padding-right: 16px; z-index: 50; border-bottom: 1px solid var(--border-color); }
.reader-tab { flex: 1; height: 44px; border-radius: 8px; background-color: transparent; color: var(--primary-blue); font-size: 14px; font-weight: 500; border: 1px solid var(--border-color); }
.reader-tab.active { background-color: var(--primary-blue); color: #FFFFFF; border-color: var(--primary-blue); }

/* Smaller text on phones when 4 tabs are visible */
.reader-tabs-4 .reader-tab { font-size: 12px; padding: 0 6px; }
@media (min-width: 480px) {
  .reader-tabs-4 .reader-tab { font-size: 13px; padding: 0 10px; }
}
@media (min-width: 720px) {
  .reader-tabs-4 .reader-tab { font-size: 14px; padding: 0 16px; }
}

/* ---------- Mode Toggle (Student / Clinician) ---------- */
.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0 24px 0;
  background-color: var(--section-bg);
  padding: 6px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
}

.mode-toggle-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  border-radius: 10px;
  background-color: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  min-height: 64px;
  -webkit-user-select: none;
  user-select: none;
}

.mode-toggle-btn:active { transform: scale(0.98); }

.mode-toggle-btn.active {
  background-color: var(--card-bg);
  color: var(--primary-purple);
  box-shadow: 0 1px 4px rgba(107, 44, 125, 0.15);
  border: 1.5px solid var(--primary-purple);
}

.mode-toggle-btn .mode-icon {
  font-size: 22px;
  line-height: 1;
  margin-bottom: 4px;
}

.mode-toggle-btn .mode-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.mode-toggle-btn .mode-sublabel {
  font-size: 11px;
  font-weight: 500;
  opacity: 0.8;
  margin-top: 2px;
}

.mode-toggle-btn.active .mode-sublabel {
  color: var(--primary-purple);
}

body.dark .mode-toggle-btn.active {
  background-color: var(--app-bg);
  color: var(--primary-purple);
}

/* ---------- Chapter-Top Action Buttons (Premium) ---------- */
.reader-chapter-actions {
  display: flex;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 4px;
}

.chapter-action-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 12px;
  border-radius: 8px;
  background-color: var(--card-bg);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}
.chapter-action-btn svg { width: 16px; height: 16px; }
.chapter-action-btn:active { transform: scale(0.97); }

.chapter-action-btn.active.bookmark {
  background-color: var(--bookmark-active);
  color: #FFFFFF;
  border-color: var(--bookmark-active);
}
.chapter-action-btn.active.bookmark svg { fill: #FFFFFF; }

.chapter-action-btn.active.note {
  background-color: var(--note-active);
  color: #FFFFFF;
  border-color: var(--note-active);
}

@keyframes action-pulse { 0% { transform: scale(1); } 50% { transform: scale(1.06); } 100% { transform: scale(1); } }
.chapter-action-btn.just-activated { animation: action-pulse 0.4s ease; }

/* ---------- Long-press hint banner ---------- */
.long-press-hint {
  background-color: var(--section-bg-purple);
  border: 1px solid var(--primary-purple-light);
  color: var(--primary-purple);
  padding: 8px 12px;
  border-radius: 8px;
  margin: 12px 0;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}
.long-press-hint .hint-close {
  margin-left: auto;
  cursor: pointer;
  font-size: 16px;
  color: var(--primary-purple);
}

/* ---------- Block long-press popup ---------- */
.block-popup-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0,0,0,0.5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.block-popup-backdrop.show { opacity: 1; pointer-events: auto; }

.block-popup-sheet {
  background-color: var(--card-bg);
  width: 100%;
  max-width: 480px;
  border-radius: 16px 16px 0 0;
  padding: 20px;
  padding-bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translateY(100%);
  transition: transform 0.3s ease;
  border-top: 1px solid var(--border-color);
}
.block-popup-backdrop.show .block-popup-sheet { transform: translateY(0); }

.block-popup-preview {
  font-size: 13px;
  color: var(--text-muted);
  background-color: var(--section-bg);
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 16px;
  max-height: 80px;
  overflow: hidden;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.block-popup-actions {
  display: grid;
  gap: 8px;
}

.block-popup-action {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 14px;
  border-radius: 10px;
  background-color: var(--section-bg);
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.block-popup-action:active { transform: scale(0.98); }
.block-popup-action.active-bookmark { background-color: rgba(245, 158, 11, 0.15); border-color: var(--bookmark-active); color: var(--bookmark-active); }
.block-popup-action.active-note { background-color: rgba(37, 99, 235, 0.1); border-color: var(--note-active); color: var(--note-active); }

.block-popup-action svg { flex-shrink: 0; width: 20px; height: 20px; }

.block-popup-highlights {
  display: flex;
  gap: 10px;
  padding: 12px 0 4px 0;
  justify-content: center;
}
.block-popup-hl-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  cursor: pointer;
  position: relative;
}
.block-popup-hl-btn.hl-yellow { background-color: #FEF9C3; border-color: #FCD34D; }
.block-popup-hl-btn.hl-green  { background-color: #DCFCE7; border-color: #6EE7B7; }
.block-popup-hl-btn.hl-pink   { background-color: #FCE7F3; border-color: #F9A8D4; }
.block-popup-hl-btn.hl-clear  { background-color: var(--card-bg); }
.block-popup-hl-btn.hl-clear::before { content: '✕'; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); color: var(--text-muted); font-size: 16px; font-weight: 700; }
.block-popup-hl-btn.active { border-width: 3px; border-color: var(--text-primary); transform: scale(1.1); }
.block-popup-hl-btn.active::after { content: '✓'; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 16px; font-weight: 900; color: var(--text-primary); }

.block-popup-cancel {
  margin-top: 12px;
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  background-color: transparent;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  cursor: pointer;
}

/* ---------- Block visual state on long-press ---------- */
.block-bookmarked {
  position: relative;
}
.block-bookmarked::before {
  content: '📌';
  position: absolute;
  left: -22px;
  top: 4px;
  font-size: 16px;
}
.block-noted {
  background-color: rgba(37, 99, 235, 0.05);
  border-left: 3px solid var(--note-active);
  padding-left: 12px !important;
  margin-left: -15px;
}
.block-hl-yellow { background-color: var(--hl-yellow); padding: 6px; border-radius: 4px; }
.block-hl-green { background-color: var(--hl-green); padding: 6px; border-radius: 4px; }
.block-hl-pink { background-color: var(--hl-pink); padding: 6px; border-radius: 4px; }

@keyframes long-press-flash {
  0% { background-color: var(--primary-purple-light); }
  100% { background-color: transparent; }
}
.long-pressing { animation: long-press-flash 0.6s ease; }

/* Subtle preview indicator at 450ms — tells user 'you ARE holding this' before final popup */
.long-press-preview {
  outline: 2px solid var(--primary-purple);
  outline-offset: 2px;
  border-radius: 6px;
  transition: outline 0.15s ease;
}
body.dark .long-press-preview {
  outline-color: var(--primary-purple-light);
}

/* ---------- Guideline Card ---------- */
.guideline-card { background-color: var(--card-bg); border-radius: 12px; border: 1px solid var(--border-color); padding: 16px; margin-bottom: 12px; }
.guideline-card-header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.guideline-card-title { font-size: 15px; font-weight: 600; color: var(--text-primary); line-height: 1.4; margin-bottom: 6px; }
.guideline-card-description { font-size: 14px; color: var(--text-muted); font-style: italic; margin-bottom: 12px; }
.guideline-card-points { list-style: disc; padding-left: 20px; }
.guideline-card-points li { font-size: 15px; color: var(--text-primary); margin-bottom: 6px; line-height: 1.5; }
.guideline-card-source { display: inline-block; margin-top: 10px; font-size: 13px; color: var(--accent-teal); text-decoration: underline; }

/* ---------- Compare Table ---------- */
.compare-topic { margin-bottom: 16px; }
.compare-topic-heading { background-color: var(--primary-dark); color: #FFFFFF; padding: 10px 16px; font-size: 13px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; border-radius: 8px 8px 0 0; margin: 0 -16px; padding-left: 16px; padding-right: 16px; }
.compare-row { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border-color); }
.compare-row:nth-child(odd) { background-color: var(--section-bg); margin: 0 -16px; padding-left: 16px; padding-right: 16px; }
.compare-row .badge { flex: 0 0 64px; text-align: center; }
.compare-row-text { flex: 1; font-size: 15px; color: var(--text-primary); line-height: 1.5; }

/* ---------- Loading Skeleton ---------- */
.skeleton { background: linear-gradient(90deg, var(--section-bg) 25%, var(--border-color) 50%, var(--section-bg) 75%); background-size: 200% 100%; animation: skeleton-loading 1.5s infinite; border-radius: 6px; }
@keyframes skeleton-loading { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---------- Empty States ---------- */
.empty-state { text-align: center; padding: 48px 24px; color: var(--text-muted); }
.empty-state-message { font-size: 15px; margin-top: 12px; line-height: 1.5; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-md { margin-top: 16px; }
.mt-lg { margin-top: 24px; }
.mb-md { margin-bottom: 16px; }
.hidden { display: none !important; }

/* =========================================================
   PHASE 8 — Settings Modal
   ========================================================= */

.settings-backdrop { position: fixed; top: 0; right: 0; bottom: 0; left: 0; background-color: rgba(0, 0, 0, 0.5); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); z-index: 1000; display: flex; align-items: flex-end; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.25s ease; }
.settings-backdrop.show { opacity: 1; pointer-events: auto; }
.settings-sheet { background-color: var(--card-bg); width: 100%; max-width: 480px; border-radius: 20px 20px 0 0; padding: 24px 20px; padding-bottom: calc(24px + env(safe-area-inset-bottom)); transform: translateY(100%); transition: transform 0.3s ease; border: 1px solid var(--border-color); border-bottom: none; }
.settings-backdrop.show .settings-sheet { transform: translateY(0); }
.settings-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.settings-title { font-size: 18px; font-weight: 700; color: var(--text-primary); }
.settings-close { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); cursor: pointer; border-radius: 50%; }
.settings-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--border-color); }
.settings-row:last-child { border-bottom: none; }
.settings-label { font-size: 15px; color: var(--text-primary); font-weight: 500; }
.settings-sublabel { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.toggle-switch { position: relative; width: 48px; height: 28px; background-color: var(--border-color); border-radius: 14px; cursor: pointer; transition: background-color 0.2s ease; flex-shrink: 0; }
.toggle-switch::after { content: ''; position: absolute; top: 2px; left: 2px; width: 24px; height: 24px; background-color: #FFFFFF; border-radius: 50%; transition: transform 0.2s ease; box-shadow: 0 1px 3px rgba(0,0,0,0.2); }
.toggle-switch.on { background-color: var(--accent-teal); }
.toggle-switch.on::after { transform: translateX(20px); }
.font-size-options { display: flex; gap: 8px; }
.font-size-btn { padding: 6px 14px; border-radius: 8px; background-color: var(--section-bg); color: var(--text-secondary); font-weight: 600; cursor: pointer; border: 1.5px solid var(--border-color); font-size: 13px; }
.font-size-btn.active { background-color: var(--primary-blue); color: #FFFFFF; border-color: var(--primary-blue); }
.font-size-btn.size-small { font-size: 12px; }
.font-size-btn.size-medium { font-size: 14px; }
.font-size-btn.size-large { font-size: 16px; }

#readerToast { position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%); background: var(--primary-dark); color: #FFFFFF; padding: 12px 24px; border-radius: 24px; font-size: 14px; font-weight: 600; z-index: 300; opacity: 0; transition: opacity 0.2s ease, transform 0.2s ease; pointer-events: none; box-shadow: 0 4px 16px rgba(0,0,0,0.25); }
body.dark #readerToast { background: var(--card-bg); border: 1px solid var(--border-color); }

/* =========================================================
   PREMIUM SUMMARY — Rich Block Renderer
   ========================================================= */

.summary-content { padding-bottom: 24px; }

.summary-source-line { font-size: 13px; font-style: italic; color: var(--text-muted); padding: 12px 0 12px 0; border-bottom: 1px solid var(--border-color); margin-bottom: 24px; line-height: 1.5; }

.block-heading-1 { font-size: 22px; font-weight: 700; color: var(--primary-purple); margin-top: 32px; margin-bottom: 12px; padding-bottom: 6px; border-bottom: 2px solid var(--primary-purple); letter-spacing: -0.01em; cursor: pointer; }
.block-heading-2 { font-size: 17px; font-weight: 700; color: var(--primary-purple-light); margin-top: 20px; margin-bottom: 8px; cursor: pointer; }

.block-question { font-size: 16px; font-weight: 700; color: var(--primary-dark); background-color: var(--section-bg-purple); border-left: 4px solid var(--primary-purple); padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 16px 0 14px 0; cursor: pointer; }
body.dark .block-question { color: var(--text-primary); background-color: #2A1F35; }

.block-paragraph { font-size: var(--fs-body); line-height: 1.7; color: var(--text-primary); margin-bottom: 14px; cursor: pointer; }
.block-paragraph.emphasis-bold { font-weight: 600; color: var(--primary-dark); }
body.dark .block-paragraph.emphasis-bold { color: var(--text-primary); }
.block-paragraph strong { color: var(--primary-purple); font-weight: 700; }
.block-paragraph em { font-style: italic; color: var(--text-secondary); }

.block-bullets { margin: 8px 0 16px 0; padding-left: 0; list-style: none; cursor: pointer; }
.block-bullets li { position: relative; padding-left: 24px; margin-bottom: 8px; font-size: var(--fs-body); line-height: 1.6; color: var(--text-primary); }
.block-bullets li::before { content: '•'; position: absolute; left: 8px; color: var(--primary-purple); font-weight: 700; font-size: 18px; line-height: 1; top: 4px; }
.block-bullets li strong { color: var(--primary-dark); font-weight: 700; }
body.dark .block-bullets li strong { color: var(--text-primary); }
.block-bullets li em { font-style: italic; color: var(--text-secondary); }
.block-bullets ul { margin-top: 6px; margin-bottom: 0; padding-left: 16px; list-style: none; }
.block-bullets ul li { padding-left: 20px; font-size: 14px; color: var(--text-secondary); }
.block-bullets ul li::before { content: '◦'; font-size: 14px; color: var(--primary-purple-light); }

.block-italic-note { font-style: italic; font-size: 14px; color: var(--text-secondary); padding: 10px 14px; background-color: var(--section-bg); border-radius: 6px; margin: 12px 0; line-height: 1.55; cursor: pointer; }

/* ---------- Tables ---------- */
.block-table-wrapper { margin: 14px 0 20px 0; overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 10px; border: 1px solid var(--border-color); cursor: pointer; }
.block-table { width: 100%; border-collapse: separate; border-spacing: 0; background-color: var(--card-bg); font-size: 14px; line-height: 1.5; }
.block-table thead { background-color: var(--primary-purple); }
.block-table thead th { color: #FFFFFF; padding: 12px 14px; text-align: left; font-size: 13px; font-weight: 700; letter-spacing: 0.03em; white-space: nowrap; }
.block-table thead th:first-child { border-top-left-radius: 10px; }
.block-table thead th:last-child { border-top-right-radius: 10px; }
.block-table tbody td { padding: 12px 14px; border-top: 1px solid var(--border-color); vertical-align: top; color: var(--text-primary); }
.block-table tbody tr:nth-child(even) td { background-color: var(--section-bg); }
.block-table tbody td:first-child { font-weight: 600; color: var(--primary-dark); min-width: 100px; }
body.dark .block-table tbody td:first-child { color: var(--text-primary); }
.block-table tbody td strong { color: var(--primary-purple); font-weight: 700; }

@media (max-width: 600px) {
  .block-table.responsive thead { display: none; }
  .block-table.responsive, .block-table.responsive tbody, .block-table.responsive tr, .block-table.responsive td { display: block; width: 100%; }
  .block-table.responsive tr { border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 10px; background-color: var(--card-bg); overflow: hidden; }
  .block-table.responsive tbody tr:nth-child(even) { background-color: var(--card-bg); }
  .block-table.responsive td { padding: 10px 14px; border-top: 1px solid var(--border-color); position: relative; padding-left: 130px; min-height: 44px; }
  .block-table.responsive td:first-child { background-color: var(--primary-purple); color: #FFFFFF; padding-left: 14px; font-weight: 700; font-size: 14px; }
  body.dark .block-table.responsive td:first-child { color: #FFFFFF; }
  /* FIX: bold/italic text inside the purple header bar must be white (overrides purple color rule above) */
  .block-table.responsive td:first-child strong,
  .block-table.responsive td:first-child em { color: #FFFFFF !important; }
  .block-table.responsive td:not(:first-child)::before { content: attr(data-label); position: absolute; left: 14px; top: 10px; font-size: 11px; font-weight: 700; color: var(--primary-purple); text-transform: uppercase; letter-spacing: 0.05em; width: 110px; }
  .block-table-wrapper { border: none; }
}

/* ---------- Flowchart ---------- */
.block-flowchart { margin: 18px 0 22px 0; display: flex; flex-direction: column; align-items: center; gap: 0; cursor: pointer; }
.flow-step { width: 100%; max-width: 100%; background-color: var(--card-bg); border: 2px solid var(--primary-purple); border-radius: 10px; padding: 12px 16px; text-align: center; font-size: 14px; font-weight: 600; color: var(--text-primary); line-height: 1.5; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.flow-step.flow-decision { border-color: var(--info-blue); background-color: #EFF6FF; }
body.dark .flow-step.flow-decision { background-color: #1E3A5F; }
.flow-step strong { color: var(--primary-purple); font-weight: 700; }
.flow-step .flow-sub { font-size: 12px; font-weight: 500; color: var(--text-secondary); margin-top: 4px; }
.flow-arrow { width: 2px; height: 24px; background-color: var(--primary-purple); margin: 0 auto; position: relative; }
.flow-arrow::after { content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%); width: 0; height: 0; border-left: 6px solid transparent; border-right: 6px solid transparent; border-top: 8px solid var(--primary-purple); }
.flow-branches { width: 100%; display: grid; gap: 10px; grid-template-columns: 1fr; margin-top: 4px; }
@media (min-width: 720px) {
  .flow-branches.cols-2 { grid-template-columns: 1fr 1fr; }
  .flow-branches.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
  .flow-branches.cols-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }
}
.flow-branch { background-color: var(--card-bg); border-radius: 10px; padding: 12px 14px; text-align: center; font-size: 13px; font-weight: 600; border: 2px solid var(--border-color); line-height: 1.45; }
.flow-branch .flow-branch-value { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.flow-branch .flow-branch-label { font-size: 12px; font-weight: 500; }
.flow-branch.col-red    { border-color: var(--critical-red); background-color: #FEF2F2; }
.flow-branch.col-red .flow-branch-value    { color: var(--critical-red); }
.flow-branch.col-orange { border-color: var(--warning-orange); background-color: #FFFBEB; }
.flow-branch.col-orange .flow-branch-value { color: var(--warning-orange); }
.flow-branch.col-yellow { border-color: var(--caution-yellow); background-color: #FEFCE8; }
.flow-branch.col-yellow .flow-branch-value { color: #A16207; }
.flow-branch.col-green  { border-color: var(--normal-green); background-color: #F0FDF4; }
.flow-branch.col-green .flow-branch-value  { color: var(--normal-green); }
.flow-branch.col-blue   { border-color: var(--info-blue); background-color: #EFF6FF; }
.flow-branch.col-blue .flow-branch-value   { color: var(--info-blue); }
.flow-branch.col-purple { border-color: var(--primary-purple); background-color: var(--section-bg-purple); }
.flow-branch.col-purple .flow-branch-value { color: var(--primary-purple); }
body.dark .flow-branch.col-red    { background-color: #3F1E1E; }
body.dark .flow-branch.col-orange { background-color: #3F2E0F; }
body.dark .flow-branch.col-yellow { background-color: #3F360F; }
body.dark .flow-branch.col-green  { background-color: #1E3F2E; }
body.dark .flow-branch.col-blue   { background-color: #1E2E4F; }

/* ---------- Callouts ---------- */
.block-callout { margin: 18px 0; border-radius: 12px; padding: 16px 18px; font-size: 14px; line-height: 1.6; cursor: pointer; }
.block-callout-title { font-size: 14px; font-weight: 700; margin-bottom: 8px; letter-spacing: 0.02em; display: flex; align-items: center; gap: 6px; }
.block-callout-content { color: var(--text-primary); }
.block-callout-content strong { font-weight: 700; }
.block-callout-content ul { list-style: none; padding: 0; margin: 0; }
.block-callout-content ul li { padding-left: 18px; position: relative; margin-bottom: 6px; }
.block-callout-content ul li::before { content: '•'; position: absolute; left: 4px; top: 0; font-weight: 700; }

.block-callout.variant-international { background: linear-gradient(135deg, #EFF6FF, #DBEAFE); border: 1px solid #93C5FD; }
.block-callout.variant-international .block-callout-title { color: var(--info-blue); }
.block-callout.variant-international ul li::before { color: var(--info-blue); }
body.dark .block-callout.variant-international { background: linear-gradient(135deg, #1E2E4F, #1E3A5F); border-color: #3B5C9C; }

.block-callout.variant-highlight { background: linear-gradient(135deg, #FFFBEB, #FEF3C7); border: 1px solid #FCD34D; }
.block-callout.variant-highlight .block-callout-title { color: #92400E; }
.block-callout.variant-highlight ul li::before { color: var(--warning-orange); }
body.dark .block-callout.variant-highlight { background: linear-gradient(135deg, #3F2E0F, #4A3F1F); border-color: #92400E; }
body.dark .block-callout.variant-highlight .block-callout-title { color: #FCD34D; }

.block-callout.variant-warning { background: linear-gradient(135deg, #FEF2F2, #FEE2E2); border: 1px solid #FCA5A5; }
.block-callout.variant-warning .block-callout-title { color: var(--critical-red); }
.block-callout.variant-warning ul li::before { color: var(--critical-red); }
body.dark .block-callout.variant-warning { background: linear-gradient(135deg, #3F1E1E, #4A1F1F); border-color: #DC2626; }

.block-callout.variant-info { background-color: var(--section-bg); border: 1px solid var(--border-color); }
.block-callout.variant-info .block-callout-title { color: var(--primary-purple); }

.block-callout.variant-pearls { background: linear-gradient(135deg, var(--section-bg-purple), #EADCF5); border: 1px solid var(--primary-purple-light); }
.block-callout.variant-pearls .block-callout-title { color: var(--primary-purple); font-size: 15px; }
.block-callout.variant-pearls ul li::before { content: '✓'; color: var(--primary-purple); font-weight: 700; }
body.dark .block-callout.variant-pearls { background: linear-gradient(135deg, #2A1F35, #3A2845); }

/* ---------- Viva ---------- */
.block-viva { margin: 22px 0; background-color: var(--card-bg); border: 2px solid var(--primary-purple); border-radius: 12px; overflow: hidden; cursor: pointer; }
.viva-header { background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light)); color: #FFFFFF; padding: 14px 16px; font-size: 15px; font-weight: 700; letter-spacing: 0.02em; }
.viva-scenario { padding: 14px 16px; font-size: 14px; font-style: italic; color: var(--text-secondary); background-color: var(--section-bg-purple); border-bottom: 1px solid var(--border-color); line-height: 1.6; }
.viva-qa-list { padding: 4px 16px 12px 16px; cursor: default; }
.viva-qa { border-bottom: 1px solid var(--border-color); padding: 12px 0; }
.viva-qa:last-child { border-bottom: none; }
.viva-question { font-size: 14px; font-weight: 700; color: var(--primary-dark); cursor: pointer; display: flex; align-items: flex-start; gap: 8px; line-height: 1.5; -webkit-user-select: none; user-select: none; }
body.dark .viva-question { color: var(--text-primary); }
.viva-question-toggle { flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; background-color: var(--primary-purple); color: #FFFFFF; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; transition: transform 0.2s ease; }
.viva-qa.expanded .viva-question-toggle { transform: rotate(45deg); }
.viva-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; font-size: 14px; color: var(--text-primary); line-height: 1.65; padding-left: 30px; }
.viva-qa.expanded .viva-answer { max-height: 1500px; padding-top: 8px; padding-bottom: 4px; }

/* ---------- TOC Button ---------- */
.summary-toc-btn { position: fixed; bottom: calc(var(--bottom-nav-height) + 16px + env(safe-area-inset-bottom)); right: 16px; width: 48px; height: 48px; border-radius: 50%; background-color: var(--primary-purple); color: #FFFFFF; display: flex; align-items: center; justify-content: center; cursor: pointer; box-shadow: 0 4px 12px rgba(107, 44, 125, 0.4); z-index: 90; border: none; }
.summary-toc-btn:active { transform: scale(0.92); }
.summary-toc-btn svg { width: 24px; height: 24px; }

.summary-toc-backdrop { position: fixed; inset: 0; background-color: rgba(0,0,0,0.5); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); z-index: 110; display: flex; align-items: flex-end; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.25s ease; }
.summary-toc-backdrop.show { opacity: 1; pointer-events: auto; }
.summary-toc-sheet { background-color: var(--card-bg); width: 100%; max-width: 480px; max-height: 70vh; border-radius: 20px 20px 0 0; padding: 20px; padding-bottom: calc(20px + env(safe-area-inset-bottom)); overflow-y: auto; transform: translateY(100%); transition: transform 0.3s ease; }
.summary-toc-backdrop.show .summary-toc-sheet { transform: translateY(0); }
.summary-toc-title { font-size: 16px; font-weight: 700; color: var(--primary-purple); margin-bottom: 14px; padding-bottom: 10px; border-bottom: 2px solid var(--primary-purple); }
.summary-toc-list { list-style: none; padding: 0; margin: 0; }
.summary-toc-item { padding: 12px 0; border-bottom: 1px solid var(--border-color); font-size: 14px; font-weight: 600; color: var(--text-primary); cursor: pointer; display: flex; align-items: center; gap: 10px; }
.summary-toc-item:last-child { border-bottom: none; }
.summary-toc-item:active { color: var(--primary-purple); }
.summary-toc-num { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; background-color: var(--section-bg-purple); color: var(--primary-purple); display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }

/* ---------- Critical Values ---------- */
.critical-val { background-color: #FEF2F2; color: var(--critical-red); padding: 1px 6px; border-radius: 4px; font-weight: 700; font-family: ui-monospace, 'SF Mono', 'Menlo', monospace; font-size: 0.95em; white-space: nowrap; }
.target-val { background-color: #F0FDF4; color: var(--normal-green); padding: 1px 6px; border-radius: 4px; font-weight: 700; font-family: ui-monospace, 'SF Mono', 'Menlo', monospace; font-size: 0.95em; white-space: nowrap; }
body.dark .critical-val { background-color: #3F1E1E; }
body.dark .target-val { background-color: #1E3F2E; }