/* ============================================================
   The TAH Terminal — Freddie Mac Institutional Design System
   Corporate palette: Freddie Navy (#0C2340), Vivid Cerulean (#009BE4),
   Freddie Green (#6CB516), Crisp Slate (#F4F6F9), Pure White (#FFFFFF).
   ============================================================ */

:root {
  /* Canvas & Surfaces */
  --bg: #F4F6F9;
  --bg-sidebar: #FFFFFF;
  --bg-sidebar-hover: #F8FAFC;
  --bg-sidebar-active: #F0F9FF;
  --bg-surface: #FFFFFF;
  --bg-subtle: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-muted-box: #F1F5F9;

  /* Freddie Mac Official Palette */
  --fm-navy: #0C2340;
  --fm-navy-deep: #071526;
  --fm-navy-light: #16365C;
  --accent: #009BE4;
  --accent-hover: #0082C3;
  --accent-dark: #005A9C;
  --accent-light: #EBF7FD;
  --accent-border: #BAE6FD;
  --accent2: #0073D1;

  /* Semantic Highlights */
  --green: #6CB516;
  --green-hover: #5CA110;
  --green-light: #F2F9E8;
  --green-border: #C8E898;
  --green-text: #325A06;

  --amber: #D97706;
  --amber-light: #FEF3C7;
  --amber-border: #FDE68A;
  --amber-text: #92400E;

  --red: #DC2626;
  --red-light: #FEF2F2;
  --red-border: #FECACA;
  --red-text: #991B1B;

  /* Neutral Typography & Borders */
  --text: #0C2340;
  --text-body: #1E293B;
  --muted: #64748B;
  --muted-light: #94A3B8;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Elevation & Geometry */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(12, 35, 64, 0.05);
  --shadow: 0 1px 3px 0 rgba(12, 35, 64, 0.08), 0 1px 2px -1px rgba(12, 35, 64, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(12, 35, 64, 0.08), 0 2px 4px -2px rgba(12, 35, 64, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(12, 35, 64, 0.08), 0 4px 6px -4px rgba(12, 35, 64, 0.04);

  font-size: 15px;
}

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

body {
  background: var(--bg);
  color: var(--text-body);
  font-family: "Open Sans", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

#app {
  display: flex;
  min-height: 100vh;
}

/* ============================================================
   Sidebar (Clean Light Institutional Nav & Collapsible)
   ============================================================ */
#sidebar {
  width: 250px;
  min-width: 250px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  color: var(--text-body);
  transition: width 0.24s cubic-bezier(0.4, 0, 0.2, 1), min-width 0.24s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 45;
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  padding: 16px 14px 12px;
  border-bottom: 1px solid var(--border);
  background: #FFFFFF;
  position: relative;
  min-height: 72px;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  cursor: pointer;
  text-decoration: none;
  min-width: 0;
  flex: 1;
}

.brand-full {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 185px;
}

.fm-logo-svg {
  width: 185px;
  height: 42px;
  display: block;
}

.brand-desk-sub {
  font-size: 9.5px;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 2px;
}

.brand-compact {
  display: none;
}

.fm-icon-svg {
  width: 36px;
  height: 36px;
  display: block;
}

.sidebar-toggle-btn {
  background: #F8FAFC;
  border: 1px solid var(--border-strong);
  color: var(--muted);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  padding: 0;
}

.sidebar-toggle-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent-dark);
}

.toggle-icon {
  transition: transform 0.24s ease;
}

.brand-disclaimer {
  margin-top: 10px;
  font-size: 10.5px;
  line-height: 1.4;
  color: var(--muted-light);
}

#nav {
  display: flex;
  flex-direction: column;
  padding: 12px 8px;
  gap: 2px;
  flex: 1;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  color: #334155;
  padding: 9px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  text-align: left;
  font-family: inherit;
  transition: background .15s ease, color .15s ease, padding .2s ease;
  position: relative;
  white-space: nowrap;
}

.nav-text {
  transition: opacity 0.15s ease;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-btn:hover {
  background: var(--bg-sidebar-hover);
  color: var(--fm-navy);
}

.nav-btn:hover .nav-ico {
  color: var(--accent);
}

.nav-btn.active {
  background: var(--bg-sidebar-active);
  color: var(--accent-dark);
  font-weight: 700;
  box-shadow: inset 3px 0 0 var(--accent);
}

.nav-ico {
  width: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  flex-shrink: 0;
  transition: color 0.15s ease;
}

.nav-btn.active .nav-ico {
  color: var(--accent);
}

.badge-pill {
  margin-left: auto;
  background: var(--red);
  color: #FFFFFF;
  border-radius: 999px;
  font-size: 10.5px;
  padding: 1px 7px;
  font-weight: 700;
  transition: all 0.15s ease;
}

.sidebar-footer {
  padding: 14px 14px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
  background: #F8FAFC;
  transition: padding 0.2s ease;
}

.streak-box {
  margin-bottom: 4px;
  font-weight: 600;
  color: var(--fm-navy);
}

#readiness-mini {
  color: var(--muted);
}

#readiness-mini strong {
  color: var(--accent-dark);
}

.sync-chip {
  display: block;
  width: 100%;
  margin-top: 8px;
  text-align: left;
  background: #FFFFFF;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 11px;
  line-height: 1.35;
  cursor: pointer;
  font-family: inherit;
  transition: all .15s ease;
}

.sync-chip:hover {
  border-color: var(--accent);
  color: var(--fm-navy);
  background: var(--accent-light);
}

.sync-chip.synced {
  color: var(--green-text);
  border-color: var(--green-border);
  background: var(--green-light);
}

.sync-chip.need-key,
.sync-chip.local-only {
  color: var(--amber-text);
  border-color: var(--amber-border);
  background: var(--amber-light);
}

.sync-chip.error {
  color: var(--red-text);
  border-color: var(--red-border);
  background: var(--red-light);
}

.sync-chip.saving,
.sync-chip.checking {
  color: var(--accent-dark);
  border-color: var(--accent-border);
  background: var(--accent-light);
}

.lock-terminal-btn {
  display: block;
  width: 100%;
  margin-top: 8px;
  text-align: center;
  background: #FFFFFF;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.35;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.lock-terminal-btn:hover {
  border-color: var(--fm-navy);
  color: var(--fm-navy);
  background: #F1F5F9;
}

/* ============================================================
   Collapsed Sidebar State (Smooth, Stable 68px Icon Rail)
   ============================================================ */
body.sidebar-collapsed #sidebar {
  width: 68px;
  min-width: 68px;
}

body.sidebar-collapsed .brand {
  padding: 14px 6px;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
}

body.sidebar-collapsed .brand-full {
  display: none;
}

body.sidebar-collapsed .brand-compact {
  display: block;
}

body.sidebar-collapsed .sidebar-toggle-btn {
  width: 24px;
  height: 24px;
}

body.sidebar-collapsed .toggle-icon {
  transform: rotate(180deg);
}

body.sidebar-collapsed .nav-btn {
  padding: 10px 0;
  justify-content: center;
  width: 44px;
  margin: 0 auto;
}

body.sidebar-collapsed .nav-text {
  display: none;
}

body.sidebar-collapsed .nav-ico {
  font-size: 15px;
}

body.sidebar-collapsed .badge-pill {
  position: absolute;
  top: 2px;
  right: 2px;
  margin-left: 0;
  padding: 1px 4px;
  font-size: 9px;
  min-width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

body.sidebar-collapsed .sidebar-footer {
  padding: 10px 4px;
  text-align: center;
}

body.sidebar-collapsed .streak-box,
body.sidebar-collapsed #readiness-mini,
body.sidebar-collapsed .brand-disclaimer {
  display: none;
}

body.sidebar-collapsed .sync-chip {
  padding: 6px 2px;
  font-size: 9px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
}

body.sidebar-collapsed .lock-terminal-btn {
  padding: 6px 2px;
  font-size: 9px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
}

/* Tooltip on hover in collapsed mode (Floating light/dark pill) */
body.sidebar-collapsed .nav-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(-4px);
  background: #0C2340;
  color: #FFFFFF;
  padding: 6px 11px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  border: 1px solid #16365C;
  z-index: 100;
}

body.sidebar-collapsed .nav-btn:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

/* ============================================================
   Main Workspace & Typography
   ============================================================ */
#main {
  flex: 1;
  padding: 32px 42px 70px;
  max-width: 1140px;
  background: var(--bg);
}

h1 {
  font-size: 26px;
  font-weight: 800;
  color: var(--fm-navy);
  margin-bottom: 6px;
  letter-spacing: -0.015em;
}

h2 {
  font-size: 19px;
  font-weight: 700;
  color: var(--fm-navy);
  margin: 26px 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--fm-navy);
  margin: 18px 0 10px;
}

h4 {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--fm-navy);
  margin-bottom: 6px;
}

.subtitle {
  color: var(--muted);
  margin-bottom: 24px;
  font-size: 14.5px;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

a {
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
  color: var(--accent-hover);
}

/* ============================================================
   Cards, Tiles & Layout
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s ease, box-shadow .15s ease;
}

.card.clickable {
  cursor: pointer;
}

.card.clickable:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.grid4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 1000px) {
  .grid3, .grid4 {
    grid-template-columns: 1fr 1fr;
  }
  .grid2 {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  text-align: center;
  padding: 18px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--fm-navy);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 11.5px;
  color: var(--muted);
  margin-top: 3px;
  text-transform: uppercase;
  letter-spacing: .05em;
  font-weight: 600;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  background: var(--accent);
  color: #FFFFFF;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  transition: all .15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
}

.btn:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow);
  color: #FFFFFF;
}

.btn.secondary {
  background: #FFFFFF;
  color: var(--fm-navy);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.btn.secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--fm-navy);
  color: var(--fm-navy);
}

.btn.green {
  background: var(--green);
  color: #FFFFFF;
}

.btn.green:hover {
  background: var(--green-hover);
}

.btn.amber {
  background: var(--amber);
  color: #FFFFFF;
}

.btn.red {
  background: var(--red);
  color: #FFFFFF;
}

.btn.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}

.btn.ghost:hover {
  background: var(--bg-muted-box);
  color: var(--text);
  border-color: var(--text);
}

.btn.small {
  padding: 6px 13px;
  font-size: 12.5px;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  filter: grayscale(0.5);
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
  align-items: center;
}

/* ============================================================
   Progress Bars
   ============================================================ */
.pbar {
  background: #E2E8F0;
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
}

.pbar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .4s ease;
}

.pbar-fill.green {
  background: var(--green);
}

.pbar-fill.amber {
  background: var(--amber);
}

.pbar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 6px 0;
}

.pbar-row .pbar {
  flex: 1;
}

.pbar-label {
  font-size: 13px;
  color: var(--text-body);
  font-weight: 500;
  min-width: 170px;
}

.pbar-val {
  font-size: 12.5px;
  color: var(--muted);
  font-weight: 600;
  min-width: 44px;
  text-align: right;
}

/* ============================================================
   Tags & Badges
   ============================================================ */
.tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  border-radius: 4px;
  padding: 3px 9px;
  margin-right: 6px;
  margin-bottom: 4px;
  background: #F1F5F9;
  color: var(--muted);
  border: 1px solid var(--border);
  letter-spacing: .02em;
}

.tag.blue {
  color: var(--accent-dark);
  border-color: var(--accent-border);
  background: var(--accent-light);
}

.tag.green {
  color: var(--green-text);
  border-color: var(--green-border);
  background: var(--green-light);
}

.tag.amber {
  color: var(--amber-text);
  border-color: var(--amber-border);
  background: var(--amber-light);
}

.tag.red {
  color: var(--red-text);
  border-color: var(--red-border);
  background: var(--red-light);
}

.tag.purple {
  color: var(--accent-dark);
  border-color: var(--accent-border);
  background: var(--accent-light);
}

/* Key-term tooltips */
.term-tip {
  position: relative;
  display: inline-block;
  cursor: help;
  margin-right: 6px;
  margin-bottom: 6px;
}

.term-tip .tag {
  margin-right: 0;
  margin-bottom: 0;
  transition: background .15s, border-color .15s;
}

.term-tip:hover .tag,
.term-tip:focus-within .tag,
.term-tip.open .tag {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent-dark);
}

.term-tip .tip-bubble {
  display: none;
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 50;
  width: min(360px, 75vw);
  background: #0C2340;
  border: 1px solid #1E3A5F;
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.45;
  color: #FFFFFF;
  box-shadow: var(--shadow-lg);
  white-space: normal;
  text-align: left;
  font-weight: 400;
}

.term-tip .tip-bubble::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 100%;
  border: 6px solid transparent;
  border-top-color: #0C2340;
}

.term-tip:hover .tip-bubble,
.term-tip:focus-within .tip-bubble,
.term-tip.open .tip-bubble {
  display: block;
}

.term-tip .tip-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--accent);
  margin-bottom: 4px;
}

/* ============================================================
   Lesson Content
   ============================================================ */
.lesson-body {
  padding: 28px 32px;
}

.lesson-body p {
  margin: 0 0 14px;
  line-height: 1.68;
  color: var(--text-body);
}

.lesson-body ul,
.lesson-body ol {
  margin: 0 0 16px 24px;
}

.lesson-body li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.lesson-body strong {
  color: var(--fm-navy);
}

.lesson-section {
  padding: 0 0 24px;
  margin: 0 0 24px;
  border-bottom: 1px solid var(--border);
}

.lesson-section:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
}

.lesson-section h2 {
  margin: 0 0 14px;
  color: var(--fm-navy);
  font-size: 18px;
  letter-spacing: -0.01em;
}

.lesson-section h3 {
  margin: 18px 0 8px;
  font-size: 15px;
  color: var(--fm-navy);
}

.lesson-section table {
  margin: 14px 0 18px;
}

.lesson-example {
  padding: 18px 20px;
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
}

.lesson-check {
  border-bottom: 0;
  padding-bottom: 0;
}

.source-excerpt {
  margin: 0 0 16px;
  padding: 14px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-light);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.source-excerpt blockquote {
  margin: 0;
  color: var(--fm-navy);
  font-weight: 600;
  line-height: 1.55;
}

.source-excerpt figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.inline-citation {
  white-space: nowrap;
  font-size: .92em;
  color: var(--accent-dark);
}

.career-appendix {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.career-appendix summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--fm-navy);
}

.career-appendix summary span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
  margin-left: 6px;
}

.career-appendix > div {
  margin-top: 14px;
  color: var(--muted);
}

.learning-objectives h3 {
  margin: 0 0 10px;
}

.learning-objectives ol {
  margin: 0 0 0 22px;
}

.learning-objectives li {
  margin-bottom: 8px;
}

.objective-id {
  display: inline-block;
  margin-right: 8px;
  color: var(--muted);
  font: 700 11px Consolas, monospace;
  text-transform: uppercase;
}

.lesson-objective {
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-left: 4px solid var(--fm-navy);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 12px;
  font-size: 13.5px;
}

.lesson-objective > span {
  display: block;
  color: var(--fm-navy);
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.lesson-objective p {
  margin: 3px 0;
}

.plain-english, .technical, .interview-angle, .distinction,
.worked-example, .self-check, .freddie-words {
  background: #F8FAFC;
  border: 1px solid var(--border);
  padding: 14px 18px;
  border-radius: var(--radius);
  margin-bottom: 14px;
  font-size: 14px;
}

.source-box {
  background: #F8FAFC;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 10px;
  font-size: 13px;
}

.source-box .src-name {
  font-weight: 700;
  color: var(--fm-navy);
}

.source-box .src-why {
  color: var(--muted);
  font-size: 12.5px;
  margin-top: 3px;
}

/* ============================================================
   Flashcards
   ============================================================ */
.flashcard {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  min-height: 250px;
  margin: 18px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow);
}

.flashcard .fc-type {
  font-size: 11.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent-dark);
  margin-bottom: 14px;
}

.flashcard .fc-front {
  font-size: 19px;
  font-weight: 700;
  color: var(--fm-navy);
  line-height: 1.45;
}

.flashcard .fc-back {
  font-size: 15.5px;
  color: var(--text-body);
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: left;
  white-space: pre-line;
  line-height: 1.6;
}

.fc-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  text-align: left;
}

.fc-opt {
  background: #FFFFFF;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 12px 16px;
  cursor: pointer;
  font-size: 14.5px;
  color: var(--text-body);
  font-family: inherit;
  text-align: left;
  transition: all .15s ease;
  box-shadow: var(--shadow-sm);
}

.fc-opt:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--fm-navy);
}

.fc-opt.correct {
  border-color: var(--green);
  background: var(--green-light);
  color: var(--green-text);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--green);
}

.fc-opt.wrong {
  border-color: var(--red);
  background: var(--red-light);
  color: var(--red-text);
}

.fc-opt:disabled {
  cursor: default;
}

.grade-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}

.fc-meta {
  text-align: center;
  color: var(--muted);
  font-size: 12.5px;
  margin-top: 12px;
}

.fill-input {
  background: #FFFFFF;
  border: 1px solid var(--border-strong);
  color: var(--text-body);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 15px;
  font-family: inherit;
  width: 100%;
  max-width: 440px;
  margin: 18px auto 0;
  display: block;
  text-align: center;
}

.fill-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 155, 228, 0.15);
}

/* ============================================================
   Quizzes
   ============================================================ */
.quiz-q {
  font-size: 17px;
  font-weight: 700;
  color: var(--fm-navy);
  margin-bottom: 16px;
  line-height: 1.45;
}

.quiz-expl {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  border-left: 4px solid var(--accent);
  color: var(--fm-navy);
}

textarea.answer-box {
  width: 100%;
  min-height: 130px;
  background: #FFFFFF;
  border: 1px solid var(--border-strong);
  color: var(--text-body);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 14.5px;
  font-family: inherit;
  resize: vertical;
  margin-top: 10px;
  line-height: 1.5;
}

textarea.answer-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 155, 228, 0.15);
}

/* ============================================================
   Badges
   ============================================================ */
.badge-card {
  display: flex;
  gap: 14px;
  align-items: center;
  opacity: 0.5;
  background: #FFFFFF;
  border: 1px solid var(--border);
  padding: 16px 18px;
  border-radius: var(--radius);
}

.badge-card.earned {
  opacity: 1;
  border-color: var(--green-border);
  background: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.badge-ico {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--green), #84CC16);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.badge-card:not(.earned) .badge-ico {
  background: #E2E8F0;
  color: var(--muted);
  filter: grayscale(1);
}

.badge-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--fm-navy);
}

.badge-desc {
  font-size: 12px;
  color: var(--muted);
}

/* ============================================================
   Readiness Ring
   ============================================================ */
.ring-wrap {
  display: flex;
  align-items: center;
  gap: 24px;
}

.ring {
  position: relative;
  width: 130px;
  height: 130px;
}

.ring svg {
  transform: rotate(-90deg);
}

.ring .ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ring .ring-num {
  font-size: 30px;
  font-weight: 800;
  color: var(--fm-navy);
}

.ring .ring-sub {
  font-size: 10.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 700;
}

/* ============================================================
   Mock Interview (Institutional Layout)
   ============================================================ */
.chat-q {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.chat-q .who {
  font-size: 11px;
  font-weight: 800;
  color: var(--accent-dark);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 6px;
}

.eval-box {
  background: var(--green-light);
  border: 1px solid var(--green-border);
  border-left: 4px solid var(--green);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 14px;
  font-size: 14px;
}

.eval-box h4 {
  color: var(--green-text);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
}

.eval-box ul {
  margin-left: 20px;
}

.pitfall-box {
  background: var(--red-light);
  border: 1px solid var(--red-border);
  border-left: 4px solid var(--red);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 14px;
  font-size: 14px;
}

.pitfall-box h4 {
  color: var(--red-text);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
}

.ai-login-card {
  max-width: 720px;
  border-color: var(--accent-border);
  background: #FFFFFF;
}

.field-label {
  display: block;
  color: var(--fm-navy);
  font-size: 12.5px;
  font-weight: 700;
  margin-bottom: 6px;
}

.mock-inline-form {
  display: flex;
  gap: 10px;
}

.mock-inline-form .text-input {
  flex: 1;
  min-width: 220px;
}

.remember-passcode {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
}

.remember-passcode input {
  accent-color: var(--accent);
}

.mock-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.mock-card-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.mock-generator-grid {
  display: grid;
  grid-template-columns: 2fr 1.3fr 1.3fr .7fr;
  gap: 12px;
  margin-top: 16px;
}

.mock-generator-grid label {
  color: var(--fm-navy);
  font-size: 12px;
  font-weight: 700;
}

.mock-generator-grid select {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 9px 10px;
  background: #FFFFFF;
  color: var(--text-body);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font: inherit;
  font-size: 13.5px;
}

.mock-generator-grid select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 155, 228, 0.15);
}

.mock-history-filter-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: 10px;
}

.mock-history-filter-grid label {
  color: var(--fm-navy);
  font-size: 12px;
  font-weight: 700;
}

.mock-history-filter-grid input,
.mock-history-filter-grid select {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 9px 10px;
  background: #FFFFFF;
  color: var(--text-body);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font: inherit;
  font-size: 13.5px;
}

.mock-history-filter-grid input:focus,
.mock-history-filter-grid select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 155, 228, 0.15);
}

.history-result-count {
  align-self: center;
  margin-left: auto;
  font-weight: 600;
}

@media (max-width: 1000px) {
  .mock-history-filter-grid {
    grid-template-columns: 1fr 1fr;
  }
  .mock-history-filter-grid label:first-child {
    grid-column: 1 / -1;
  }
}

.mock-answer-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  margin-top: 6px;
}

.mock-history-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  background: #FFFFFF;
}

.mock-history-row > div:first-child {
  min-width: 0;
}

.mock-history-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 4px;
}

.mock-history-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.score-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  border-radius: 999px;
  border: 1px solid var(--amber-border);
  background: var(--amber-light);
  color: var(--amber-text);
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 800;
}

.score-chip.strong {
  color: var(--green-text);
  border-color: var(--green-border);
  background: var(--green-light);
}

.ai-score-hero {
  display: grid;
  grid-template-columns: 150px 1fr;
  align-items: center;
  gap: 24px;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 16px 0;
  box-shadow: var(--shadow-sm);
}

.ai-score-number {
  font-size: 52px;
  line-height: 1;
  font-weight: 800;
  color: var(--fm-navy);
}

.ai-dimension-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 20px;
}

.ai-dimension-grid > div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 10px;
}

.ai-dimension-grid span {
  color: var(--muted);
  font-size: 11.5px;
  text-transform: uppercase;
  font-weight: 700;
}

.ai-dimension-grid strong {
  font-size: 13.5px;
  color: var(--fm-navy);
}

.ai-dimension-grid .pbar {
  grid-column: 1 / -1;
  height: 6px;
}

.feedback-issue {
  padding: 10px 0;
  border-bottom: 1px solid rgba(220, 38, 38, 0.15);
}

.feedback-issue:last-child {
  border-bottom: 0;
}

.feedback-issue p {
  margin: 6px 0 0;
  color: var(--text-body);
}

.source-study-card {
  margin-top: 16px;
  background: #FFFFFF;
}

.source-study-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.source-study-row:last-of-type {
  border-bottom: 0;
}

.source-study-row p {
  margin: 4px 0 0;
  color: var(--muted);
}

/* ============================================================
   Additional Resources & Day Jump Navigation
   ============================================================ */
.day-jump-container {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
}

.day-jump-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.day-jump-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.day-jump-pill {
  background: #F8FAFC;
  border: 1px solid var(--border-strong);
  color: var(--fm-navy);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.day-jump-pill:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent-dark);
}

.day-jump-pill.done {
  background: var(--green-light);
  border-color: var(--green-border);
  color: var(--green-text);
}

.day-jump-pill.partial {
  background: var(--accent-light);
  border-color: var(--accent-border);
  color: var(--accent-dark);
}

.day-jump-pill .pill-count {
  font-size: 11px;
  opacity: 0.85;
}

.resource-section-anchor {
  scroll-margin-top: 24px;
}

.resource-card {
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.resource-card.accessed {
  border-left: 4px solid var(--green);
  background: #FAFCF8;
}

/* ============================================================
   Tables
   ============================================================ */
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 12px 0 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-table th {
  text-align: left;
  background: #F1F5F9;
  color: var(--fm-navy);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
}

.data-table tr:nth-child(even) td {
  background: #F8FAFC;
}

.data-table tr:last-child td {
  border-bottom: none;
}

/* ============================================================
   Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 35, 64, 0.5);
  backdrop-filter: blur(2px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 740px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  padding: 32px 36px;
  box-shadow: var(--shadow-lg);
}

/* ============================================================
   Misc Utility Components
   ============================================================ */
.flag-item {
  border-left: 3px solid var(--red);
  padding: 12px 16px;
  background: var(--red-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 10px;
  font-size: 13.5px;
}

.back-link {
  color: var(--accent-dark);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  padding: 0;
  margin-bottom: 14px;
  display: inline-block;
}

.back-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 12.5px;
}

.mono {
  font-family: Consolas, monospace;
}

.correct-text {
  color: var(--green-text);
  font-weight: 700;
}

.wrong-text {
  color: var(--red-text);
  font-weight: 700;
}

.next-steps {
  border-left: 4px solid var(--accent);
}

.numbering-note {
  border-left: 3px solid var(--amber);
  background: var(--amber-light);
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 12px 0 20px;
  font-size: 13.5px;
  color: var(--amber-text);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 7px;
}

.status-dot.done {
  background: var(--green);
}

.status-dot.progress {
  background: var(--amber);
}

.status-dot.todo {
  background: #CBD5E1;
}

input[type="number"],
input[type="text"],
input[type="password"] {
  background: #FFFFFF;
  border: 1px solid var(--border-strong);
  color: var(--text-body);
  border-radius: 6px;
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
}

#studyKey {
  width: 100%;
  margin: 10px 0 6px;
}

.key-err {
  color: var(--red-text);
  font-size: 12.5px;
  min-height: 18px;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 155, 228, 0.15);
}

.ex-input-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 10px 0;
  flex-wrap: wrap;
}

.ex-input-row label {
  font-size: 14px;
  color: var(--text-body);
  min-width: 300px;
}

/* ============================================================
   Responsive Topbar & Mobile Overlay
   ============================================================ */
.topbar {
  display: none;
}

.nav-backdrop {
  display: none;
}

@media (max-width: 820px) {
  :root {
    font-size: 16px;
  }

  #app {
    flex-direction: column;
  }

  .topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 40;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    padding-top: max(12px, env(safe-area-inset-top));
    color: var(--fm-navy);
  }

  .nav-toggle {
    background: #F8FAFC;
    color: var(--fm-navy);
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    min-height: 44px;
    cursor: pointer;
  }

  .topbar-title {
    font-weight: 800;
    font-size: 15px;
    color: var(--fm-navy);
    letter-spacing: .04em;
    text-transform: uppercase;
  }

  .sidebar-toggle-btn {
    display: none !important;
  }

  #sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(290px, 86vw) !important;
    min-width: 0 !important;
    height: 100%;
    z-index: 50;
    transform: translateX(-105%);
    transition: transform .2s ease;
    box-shadow: 8px 0 24px rgba(0, 0, 0, 0.15);
  }

  body.nav-open #sidebar {
    transform: translateX(0);
  }

  body.sidebar-collapsed .brand {
    padding: 18px 16px 14px !important;
    flex-direction: row !important;
  }

  body.sidebar-collapsed .brand-full {
    display: flex !important;
  }

  body.sidebar-collapsed .brand-compact {
    display: none !important;
  }

  body.sidebar-collapsed .nav-btn {
    padding: 12px 14px !important;
    justify-content: flex-start !important;
    width: 100% !important;
  }

  body.sidebar-collapsed .nav-text {
    display: inline !important;
  }

  body.sidebar-collapsed .sidebar-footer {
    padding: 14px 16px !important;
    text-align: left !important;
  }

  body.sidebar-collapsed .streak-box,
  body.sidebar-collapsed #readiness-mini,
  body.sidebar-collapsed .brand-disclaimer {
    display: block !important;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 45;
    background: rgba(12, 35, 64, 0.35);
    backdrop-filter: blur(1px);
  }

  .nav-backdrop[hidden] {
    display: none;
  }

  .nav-btn {
    padding: 12px 14px;
    font-size: 15px;
    min-height: 44px;
  }

  #main {
    padding: 20px 16px 80px;
    width: 100%;
    max-width: none;
  }

  .lesson-body {
    padding: 20px 16px;
  }

  .lesson-example {
    padding: 15px 14px;
  }

  h1 {
    font-size: 22px;
  }

  .ring-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .pbar-row {
    flex-wrap: wrap;
  }

  .pbar-row .pbar-label {
    min-width: 0;
    width: 100%;
  }

  .btn, .btn.small {
    min-height: 44px;
  }

  .fc-opt, .fc-options button {
    min-height: 44px;
    width: 100%;
  }

  .modal {
    padding: 20px 16px;
    max-height: 92vh;
  }

  .modal-overlay {
    padding: 12px;
    align-items: flex-end;
  }

  table.data-table {
    font-size: 12.5px;
    display: block;
    overflow-x: auto;
  }

  .ex-input-row label {
    min-width: 0;
    width: 100%;
  }

  input[type="number"], input[type="text"], input[type="password"] {
    font-size: 16px;
    width: 100%;
    max-width: 100%;
  }

  .mock-stat-grid, .mock-generator-grid, .mock-history-filter-grid, .ai-dimension-grid {
    grid-template-columns: 1fr;
  }

  .mock-history-filter-grid label:first-child {
    grid-column: auto;
  }

  .mock-inline-form, .mock-history-row, .source-study-row {
    flex-direction: column;
    align-items: stretch;
  }

  .mock-history-actions {
    justify-content: space-between;
  }

  .ai-score-hero {
    grid-template-columns: 1fr;
  }

  .mock-answer-meta {
    flex-direction: column;
    gap: 2px;
  }
}