/* ============================================================
   WhalePrep — Modern Student-Friendly Educational Theme
   Built for clarity, readability, and comfortable study sessions.
   ============================================================ */

:root {
  --bg: #090d16;
  --panel: #101728;
  --card: #151f35;
  --card-hover: #1b2845;
  --input: #0e1524;
  --border: #233352;
  --border-focus: #3b82f6;
  --border-subtle: #1c2942;
  
  --text-main: #f8fafc;
  --text-body: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-active: #1e40af;
  --primary-glow: rgba(37, 99, 235, 0.25);
  
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.2);

  --ok: #10b981;
  --ok-bg: rgba(16, 185, 129, 0.15);
  
  --amber: #f59e0b;
  --amber-bg: rgba(245, 158, 11, 0.15);
  
  --bad: #ef4444;
  --bad-bg: rgba(239, 68, 68, 0.15);

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.45);
}

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

html {
  background: var(--bg);
  color-scheme: dark;
}

body {
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px 80px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #38bdf8;
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: #7dd3fc;
  text-decoration: none;
}

/* Headings */
h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-main);
  line-height: 1.25;
  margin: 20px 0 12px;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-main);
  margin: 28px 0 14px;
}

h3 {
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 8px;
}

p {
  margin-bottom: 12px;
}

.meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.dim {
  color: var(--text-dim);
  font-size: 0.825rem;
}

/* Topbar Header */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  background: rgba(9, 13, 22, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand span {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(37, 99, 235, 0.35);
  color: #60a5fa;
  font-weight: 500;
  font-size: 0.725rem;
}

.nav {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 0.875rem;
}

.nav a.hidem {
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
}

.nav a.hidem:hover {
  color: var(--text-main);
  background: var(--panel);
}

/* Modern Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--panel);
  color: var(--text-body);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  min-height: 42px;
  box-shadow: var(--shadow-sm);
}

.btn:hover:not(:disabled) {
  background: var(--card-hover);
  border-color: var(--border-focus);
  color: var(--text-main);
  transform: translateY(-1px);
}

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

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.btn.primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.45);
}

.btn.ok {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}
.btn.ok:hover:not(:disabled) {
  background: var(--ok);
  color: #ffffff;
}

.btn.danger {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: #f87171;
}
.btn.danger:hover:not(:disabled) {
  background: var(--bad);
  color: #ffffff;
}

.btn.sm {
  padding: 6px 12px;
  font-size: 0.775rem;
  min-height: 32px;
  border-radius: var(--radius-sm);
}

.btn.block {
  display: flex;
  width: 100%;
}

/* Cards & Surfaces */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: #334769;
}

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

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

.kv {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 18px 0;
}

.kv .card {
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.kv .card b {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
}

/* Status text tokens */
.ok-t { color: var(--ok); font-weight: 600; }
.bad-t { color: var(--bad); font-weight: 600; }
.warn-t { color: var(--amber); font-weight: 600; }
.cyan-t { color: var(--cyan); font-weight: 600; }

/* Progress segments */
.seg {
  display: flex;
  height: 8px;
  border-radius: var(--radius-pill);
  background: #1e293b;
  overflow: hidden;
}
.seg i {
  display: block;
  height: 100%;
}

/* Focus indicator */
:focus-visible {
  outline: 2px solid #38bdf8;
  outline-offset: 2px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.85rem;
}

th {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.725rem;
  font-weight: 600;
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-subtle);
  font-variant-numeric: tabular-nums;
}

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

/* Form Inputs */
input[type=text],
input[type=email],
input[type=number],
select,
textarea {
  background: var(--input);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 11px 14px;
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  width: 100%;
  transition: all 0.15s ease;
  min-height: 44px;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

input::placeholder {
  color: var(--text-dim);
}

label:not(.chapter-select-wrap):not(.subtopic-chip):not(.opt):not(.toggle-card) {
  display: block;
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 12px 0 5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.chapter-select-wrap,
.subtopic-chip,
.opt,
.toggle-card {
  text-transform: none !important;
  letter-spacing: normal !important;
  margin: 0;
}

/* Footer */
footer {
  margin-top: 56px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  color: var(--text-dim);
  font-size: 0.8rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================================
   TOPIC SELECTION PAGE (/build) — Modern Student Friendly Revamp
   ============================================================ */

.build-header {
  margin: 10px 0 24px;
}

.preset-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.preset-label {
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-right: 4px;
}

.preset-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--card);
  color: var(--text-body);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  background: var(--card-hover);
  border-color: #38bdf8;
  color: #ffffff;
  transform: translateY(-1px);
}

.preset-btn.secondary {
  color: var(--text-dim);
  background: transparent;
}
.preset-btn.secondary:hover {
  color: #ef4444;
  border-color: #ef4444;
}

/* Subject Filter Tabs */
.subject-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  overflow-x: auto;
}

.sub-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.sub-tab:hover {
  color: var(--text-main);
  background: var(--panel);
}

.sub-tab.active {
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.tab-badge {
  font-size: 0.725rem;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.15);
  font-weight: 500;
}

/* Build Layout Grid */
.build-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 24px;
  align-items: start;
}

.picker-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.subject-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.subject-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
  padding: 0 4px;
}

.subject-title-badge {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #38bdf8;
}

.btn-select-all-subject {
  font-size: 0.775rem;
  color: var(--text-dim);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-select-all-subject:hover {
  color: #ffffff;
  background: var(--panel);
}

/* Chapter Card */
.chapter-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.15s ease;
}

.chapter-card:hover {
  border-color: #3b82f6;
}

.chapter-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  gap: 12px;
}

.chapter-select-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.chapter-select-wrap input[type=checkbox] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
}

.chapter-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.chapter-q-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.btn-expand-subtopics {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.775rem;
  font-weight: 500;
  background: var(--panel);
  color: var(--text-muted);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-expand-subtopics:hover {
  background: var(--card-hover);
  color: var(--text-main);
  border-color: var(--border-focus);
}

.chevron-icon {
  transition: transform 0.2s ease;
}

.chapter-card.expanded .chevron-icon {
  transform: rotate(180deg);
}

/* Subtopics Drawer/Tray */
.subtopics-tray {
  display: none;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 14px 18px 18px;
}

.chapter-card.expanded .subtopics-tray {
  display: block;
}

.subtopics-tray-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.75rem;
}

.btn-sub-link {
  color: #38bdf8;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  font-family: inherit;
  padding: 0;
}
.btn-sub-link:hover {
  text-decoration: underline;
}

.subtopics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 8px;
}

.subtopic-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  background: var(--card);
  border: 1px solid var(--border-subtle);
  font-size: 0.825rem;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.15s ease;
}

.subtopic-chip:hover {
  border-color: #3b82f6;
  background: var(--card-hover);
  color: #ffffff;
}

.subtopic-chip input[type=checkbox] {
  width: 15px;
  height: 15px;
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
}

.subtopic-chip span {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Settings Column */
.settings-sticky {
  position: sticky;
  top: 80px;
}

.settings-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 22px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.settings-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-lbl {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0;
}

/* Count Pills Selector */
.count-pills {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.count-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 9px 4px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--panel);
  color: var(--text-body);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s ease;
}

.count-pill:hover {
  background: var(--card-hover);
  border-color: #38bdf8;
  color: #ffffff;
}

.count-pill.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.4);
}

/* Toggle Switch Cards */
.toggle-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--border);
  cursor: pointer;
  margin: 0;
  text-transform: none;
  letter-spacing: normal;
  transition: all 0.15s ease;
}

.toggle-card:hover {
  border-color: #334769;
}

.toggle-card input[type=checkbox] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  margin-top: 2px;
  flex-shrink: 0;
}

.toggle-card-content {
  flex: 1;
}

.toggle-card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}

.toggle-card-title b {
  font-size: 0.875rem;
  color: var(--text-main);
}

.badge-mode {
  font-size: 0.675rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.selection-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(14, 21, 36, 0.6);
  border: 1px solid var(--border-subtle);
}

.summary-stat {
  display: flex;
  flex-direction: column;
}

.summary-stat b {
  font-size: 0.875rem;
  color: var(--text-main);
}

/* Large Create Paper Button */
.btn-create-paper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  background: #2563eb;
  color: #ffffff;
  border: none;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.45);
  transition: all 0.15s ease;
}

.btn-create-paper:hover:not(:disabled) {
  background: #1d4ed8;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
  transform: translateY(-1px);
}

.btn-create-paper:disabled {
  opacity: 0.45;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.btn-subtext {
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.85;
}

/* ============================================================
   EXAM CBT SCREEN & QUESTION TYPOGRAPHY
   Strict font-size, weight and line-height normalization.
   ============================================================ */

.cbt {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 20px;
}

.exam-bar {
  position: sticky;
  top: 0;
  z-index: 25;
  background: rgba(9, 13, 22, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0 0;
  margin: 0 0 16px;
}

.exam-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 48px;
}

.exam-title {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.exam-title b {
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exam-clock {
  text-align: right;
  flex-shrink: 0;
}

.exam-progress {
  height: 4px;
  background: #1e293b;
  border-radius: var(--radius-pill);
  margin-top: 10px;
  overflow: hidden;
}

.exam-progress i {
  display: block;
  height: 100%;
  background: #38bdf8;
  width: 0;
  transition: width 0.25s ease;
}

.exam-bar.complete .exam-progress i {
  background: var(--ok);
}

.timer {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.timer.urgent {
  color: #f97316;
}

.timer.critical {
  color: var(--bad);
  animation: timer-pulse 1s infinite alternate;
}

@keyframes timer-pulse {
  from { opacity: 1; }
  to { opacity: 0.55; }
}

.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.825rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

/* Question Stem: Pure, Consistent Typography */
.stem {
  font-size: 1.0625rem; /* 17px */
  line-height: 1.7;
  color: #f8fafc;
  font-weight: 400;
  margin: 14px 0 16px;
}

.stem,
.stem p,
.stem div,
.stem span {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: #f8fafc;
}

.stem p {
  margin: 0 0 10px;
}

.stem p:last-child {
  margin-bottom: 0;
}

.stem b,
.stem strong {
  font-weight: 600;
  color: #ffffff;
}

.stem h1,
.stem h2,
.stem h3,
.stem h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: #ffffff;
  margin: 10px 0 6px;
}

.meta-line {
  margin-bottom: 16px;
  font-size: 0.825rem;
  color: var(--text-dim);
}

/* KaTeX equations scaling */
.katex {
  font-size: 1.08em;
  text-rendering: auto;
}

/* Question type pill (right side of pane head) */
.qpill {
  font-size: 0.75rem;
  color: var(--text-dim);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 3px 10px;
  white-space: nowrap;
}

/* White typeset question card, mirrors the NTA CBT question block */
.qcard {
  background: #ffffff;
  color: #111827;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  margin: 0 0 12px;
}

.qcard .stem,
.qcard .stem p,
.qcard .stem div,
.qcard .stem span {
  color: #111827;
}

.qcard .stem {
  margin: 0 0 12px;
}

.qcard p {
  margin: 8px 0;
  color: #111827;
  line-height: 1.7;
}

.qcard .katex {
  color: #111827;
}

/* Multiple Choice Option Cards */
.opt {
  display: flex;
  gap: 14px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  margin: 10px 0;
  font-size: 1rem;
  color: #e2e8f0;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 52px;
}

.opt:hover {
  background: var(--card-hover);
  border-color: #3b82f6;
  transform: translateX(2px);
}

.opt.sel {
  background: rgba(37, 99, 235, 0.18);
  border-color: #3b82f6;
  color: #ffffff;
  box-shadow: 0 0 0 1px #3b82f6;
}

.opt input[type=radio] {
  width: 18px;
  height: 18px;
  accent-color: #2563eb;
  flex-shrink: 0;
}

.opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  background: var(--border);
  color: #f8fafc;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.opt.sel .opt-letter {
  background: #2563eb;
  color: #ffffff;
}

.opt-text {
  flex: 1;
  min-width: 0;
  line-height: 1.5;
}

.opt p {
  display: inline;
  margin: 0;
}

/* Exam action bar, mirrors the NTA CBT bottom strip */
.exam-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.exam-actions-left,
.exam-actions-right {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.exam-actions .btn {
  flex: 0 1 auto;
}

@media (max-width: 720px) {
  .exam-actions-left,
  .exam-actions-right {
    width: 100%;
  }
  .exam-actions .btn {
    flex: 1 1 45%;
  }
}

/* ZenithPrep-style action colors */
.btn.act-save {
  background: #059669;
  border-color: #059669;
  color: #ffffff;
}

.btn.act-save:hover {
  background: #047857;
}

.btn.act-mark {
  background: #d97706;
  border-color: #d97706;
  color: #ffffff;
}

.btn.act-mark:hover {
  background: #b45309;
}

.btn.act-review {
  background: #7c3aed;
  border-color: #7c3aed;
  color: #ffffff;
}

.btn.act-review:hover {
  background: #6d28d9;
}

.btn.act-review.danger {
  background: #581c87;
  border-color: #8b5cf6;
}

/* Candidate + autosave indicator in the exam bar */
.exam-cand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  margin-right: 18px;
  font-size: 0.825rem;
}

#save-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.2s ease;
}

#save-dot.busy {
  background: #f59e0b;
}

#save-dot.ok {
  background: #10b981;
}

#save-dot.fail {
  background: #ef4444;
}

/* Encouragement card under the overview stats */
.card.encourage {
  margin: 14px 0;
  border-left: 3px solid #10b981;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), transparent 60%);
}

.card.encourage b {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
  color: #ffffff;
}

.card.encourage p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Result page: sticky left nav + main column (ZenithPrep style) */
.result-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 20px;
  align-items: start;
}

.result-nav {
  position: sticky;
  top: 76px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
}

.result-nav b {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.result-nav a {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
}

.result-nav a:hover {
  background: var(--card-hover);
  color: #ffffff;
}

.result-nav .btn {
  margin-top: 6px;
  text-align: center;
}

.result-nav .badge {
  display: inline-block;
  min-width: 18px;
  padding: 1px 5px;
  border-radius: 999px;
  background: #7c3aed;
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  text-align: center;
}

@media (max-width: 900px) {
  .result-layout {
    grid-template-columns: 1fr;
  }
  .result-nav {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }
  .result-nav .btn {
    margin-top: 0;
  }
}

/* Palette Side Column */
.cbt-side {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 18px;
  display: flex;
  flex-direction: column;
}

.cbt-side h2 {
  font-size: 0.875rem;
  margin-top: 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin: 12px 0;
}

.pal {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--text-muted);
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 40px;
  transition: all 0.15s ease;
}

.pal:hover {
  border-color: #38bdf8;
  color: #ffffff;
}

.pal.cur {
  border-color: #38bdf8;
  color: #ffffff;
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.35);
}

.pal.ans {
  background: #064e3b;
  border-color: #10b981;
  color: #6ee7b7;
}

.pal.rev {
  background: #78350f;
  border-color: #f59e0b;
  color: #fde68a;
}

.pal.ansrev {
  background: #4c1d95;
  border-color: #8b5cf6;
  color: #ddd6fe;
}

.pal.skip {
  background: var(--panel);
}

/* Five-state legend counts above the palette grid */
.pal-stats {
  list-style: none;
  margin: 10px 0 4px;
  padding: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pal-stats li {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 0;
  justify-content: space-between;
}

.pal-stats b {
  font-weight: 700;
  color: var(--text-dim);
}

.pal-stats .sw {
  width: 10px;
  height: 10px;
  display: inline-block;
  border-radius: 2px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.pal-stats .sw.visit {
  background: #ffffff;
  border-color: #9ca3af;
}

.pal-stats .sw.skip {
  background: #b91c1c;
  border-color: #ef4444;
}

.pal-stats .sw.ans {
  background: #064e3b;
  border-color: #10b981;
}

.pal-stats .sw.rev {
  background: #78350f;
  border-color: #f59e0b;
}

.pal-stats .sw.ansrev {
  background: #4c1d95;
  border-color: #8b5cf6;
}

/* Floating Palette Button (Mobile) */
button.pal-fab {
  display: none;
}

.cbt-side [data-close-palette] {
  display: none;
}

/* Per-Subject Timer Strips */
.subj-timer-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0 6px;
}

.subj-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
}

.subj-timer b {
  color: var(--text-main);
  min-width: 5ch;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.subj-timer.active {
  border-color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  color: #38bdf8;
}

.subj-timer.warn {
  border-color: var(--amber);
  color: var(--amber);
}

.subj-timer.done {
  opacity: 0.4;
  text-decoration: line-through;
}

/* Mistake Tagging */
.mistake-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* Sign-in */
.signin-primary {
  max-width: 420px;
}

.signin-or {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 420px;
  margin: 18px 0 6px;
  color: var(--text-dim);
  font-size: 0.775rem;
}

.signin-or::before,
.signin-or::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.signin-or span {
  padding: 0 4px;
}

/* Bottom Navigation Bar for Mobile */
.tabbar {
  display: none;
}

/* ============================================================
   RESPONSIVE DESIGN (Tablets, Phones)
   ============================================================ */

@media (max-width: 1024px) {
  .build-layout {
    grid-template-columns: 1fr;
  }
  .settings-sticky {
    position: static;
  }
  .cbt {
    grid-template-columns: 1fr;
    padding-bottom: 76px;
  }
  .cbt-side {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--card);
    border-top: 1px solid var(--border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: 16px 20px calc(76px + env(safe-area-inset-bottom));
    max-height: 75vh;
    overflow-y: auto;
    transform: translateY(100%);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0.25s;
    z-index: 35;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5);
  }
  .cbt-side.open {
    transform: translateY(0);
    visibility: visible;
  }
  .cbt-side [data-close-palette] {
    display: block;
  }
  button.pal-fab {
    display: flex;
    align-items: center;
    position: fixed;
    right: 16px;
    bottom: calc(64px + env(safe-area-inset-bottom));
    z-index: 25;
    min-height: 46px;
    padding: 10px 18px;
    border-radius: var(--radius-pill);
    background: var(--card);
    border: 1px solid #38bdf8;
    color: #38bdf8;
    font-weight: 600;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  }
  button.pal-fab[aria-expanded=true] {
    display: none;
  }
  .palette {
    grid-template-columns: repeat(7, 1fr);
  }
}

@media (max-width: 700px) {
  body {
    padding: 0 14px 72px;
    font-size: 14.5px;
  }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.05rem; }
  .grid2, .grid3 {
    grid-template-columns: 1fr;
  }
  .kv {
    grid-template-columns: 1fr 1fr;
  }
  .nav a.hidem {
    display: none;
  }
  .brand span {
    display: none;
  }
  .tabbar {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    background: rgba(16, 23, 40, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .tabbar a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 6px 4px;
    font-size: 0.775rem;
    font-weight: 600;
    color: var(--text-muted);
    border-right: 1px solid var(--border-subtle);
  }
  .tabbar a:last-child {
    border-right: none;
  }
  .tabbar a:active, .tabbar a.active {
    color: #ffffff;
    background: rgba(37, 99, 235, 0.2);
  }
  body.exam {
    padding-bottom: calc(120px + env(safe-area-inset-bottom));
  }
  .palette {
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
  }
  .pal {
    min-height: 46px;
  }
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -14px;
    padding: 0 14px;
  }
}

/* ============================================================
   PRINT / PDF STYLESHEET
   Clean black-on-white layout, no interactive chrome.
   ============================================================ */

@media print {
  .topbar, .tabbar, footer, .exam-bar, .cbt-side, .opt-actions,
  .mistake-row, .pal-fab, #pal-toggle, form button, .btn, .subj-timer-bar,
  .exam-progress, .cbt-count, .pal-stats, .legend, script, .preset-bar, .subject-tabs,
  .settings-col, .chapter-actions, .subtopics-tray-head {
    display: none !important;
  }
  body {
    background: #ffffff !important;
    color: #000000 !important;
    padding: 0 !important;
    font-size: 11pt !important;
  }
  .card, .qpane, details.card, .chapter-card {
    background: #ffffff !important;
    color: #000000 !important;
    border: 1px solid #cccccc !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    break-inside: avoid;
    margin-bottom: 18px !important;
  }
  .opt, .opt.sel, .chk, input[type=text], select, textarea {
    background: #ffffff !important;
    color: #000000 !important;
    border: 1px solid #cccccc !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }
  .qpane, .qpane[hidden] {
    display: block !important;
  }
  .stem, .stem p, .stem span, p, span, div, h1, h2, h3 {
    color: #000000 !important;
  }
  .dim, .meta {
    color: #555555 !important;
  }
  .opt-letter {
    background: #eeeeee !important;
    color: #000000 !important;
    border: 1px solid #999999 !important;
  }
  @page {
    margin: 15mm;
  }
}

/* ============================================================
   ZENITHPREP UI REPLICA STYLES
   ============================================================ */

.zp-builder-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 10px 0 60px;
}

.zp-page-title {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin: 14px 0 8px;
}

.zp-page-subtitle {
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 24px;
}

/* Top Mode Cards */
.zp-mode-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 22px;
}

.zp-mode-card {
  background: #131b32;
  border: 1px solid #24355a;
  border-radius: 12px;
  padding: 16px 18px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.zp-mode-card:hover {
  background: #182342;
  border-color: #38bdf8;
}

.zp-mode-card.active {
  background: #16254a;
  border: 2px solid #3b82f6;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.25);
}

.zp-mode-title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.zp-mode-card.active .zp-mode-title {
  color: #60a5fa;
}

.zp-mode-desc {
  font-size: 0.825rem;
  color: #94a3b8;
  line-height: 1.4;
}

/* Complete Syllabus Section */
.zp-syllabus-section {
  margin-bottom: 24px;
}

.zp-btn-syllabus {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #172344;
  border: 1px solid #2e4478;
  border-radius: 10px;
  padding: 10px 18px;
  color: #93c5fd;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
}

.zp-btn-syllabus:hover {
  background: #1d2c54;
  border-color: #60a5fa;
  color: #ffffff;
  transform: translateY(-1px);
}

.zp-book-icon {
  font-size: 1.1rem;
}

.zp-syllabus-desc {
  color: #94a3b8;
  font-size: 0.85rem;
  margin-top: 8px;
  line-height: 1.45;
}

/* Subject Filter Pills Bar */
.zp-subject-pills-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.zp-subj-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #131b32;
  border: 1px solid #233357;
  border-radius: 10px;
  padding: 9px 16px;
  color: #cbd5e1;
  font-size: 0.925rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.zp-subj-pill:hover {
  background: #182342;
  color: #ffffff;
}

.zp-subj-pill.active {
  background: #1d2b52;
  border-color: #3b82f6;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.zp-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-math { background: #c084fc; box-shadow: 0 0 8px rgba(192, 132, 252, 0.6); }
.dot-phy  { background: #22d3ee; box-shadow: 0 0 8px rgba(34, 211, 238, 0.6); }
.dot-chem { background: #fb923c; box-shadow: 0 0 8px rgba(251, 146, 60, 0.6); }

.zp-subj-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.12);
  color: #e2e8f0;
}

/* Search and Action Bar */
.zp-search-row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

.zp-search-input-wrap {
  position: relative;
  flex: 1;
}

.zp-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #64748b;
  pointer-events: none;
}

#zp-search-input {
  background: #10172c;
  border: 1px solid #202d4b;
  border-radius: 8px;
  padding: 10px 14px 10px 38px;
  font-size: 0.875rem;
  color: #ffffff;
  min-height: 40px;
  width: 100%;
}
#zp-search-input:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.zp-search-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.zp-btn-action {
  background: #141c33;
  border: 1px solid #24355a;
  border-radius: 8px;
  padding: 8px 14px;
  color: #cbd5e1;
  font-size: 0.825rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
}

.zp-btn-action:hover {
  background: #1a2544;
  color: #ffffff;
  border-color: #38bdf8;
}

/* Chapter List Container (ZenithPrep Table Style) */
.zp-chapters-container {
  background: #11182d;
  border: 1px solid #1f2c4a;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
}

.zp-chapter-item {
  border-bottom: 1px solid #1a243f;
}
.zp-chapter-item:last-child {
  border-bottom: none;
}

.zp-chapter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  transition: background 0.15s ease;
}

.zp-chapter-row:hover {
  background: #151f38;
}

.zp-chk-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  cursor: pointer;
  text-transform: none;
  letter-spacing: normal;
  margin: 0;
}

.zp-chk-wrap input[type=checkbox] {
  width: 19px;
  height: 19px;
  accent-color: #2563eb;
  border-radius: 4px;
  cursor: pointer;
}

.zp-chapter-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #f8fafc;
  line-height: 1.4;
}

.zp-expand-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: #64748b;
  cursor: pointer;
  transition: all 0.15s ease;
}

.zp-expand-btn:hover {
  color: #38bdf8;
  background: #17223e;
}

.zp-caret-icon {
  transition: transform 0.2s ease;
}

.zp-chapter-item.expanded .zp-caret-icon {
  transform: rotate(90deg);
}

/* Subtopics Drawer */
.zp-subtopics-tray {
  display: none;
  background: #0d1324;
  border-top: 1px solid #19243e;
  padding: 12px 18px 16px 48px;
}

.zp-chapter-item.expanded .zp-subtopics-tray {
  display: block;
}

.zp-subtopics-tray-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.775rem;
}

.zp-link-btn {
  color: #38bdf8;
  background: none;
  border: none;
  font-size: 0.75rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
}
.zp-link-btn:hover {
  text-decoration: underline;
}

.zp-subtopics-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.zp-subtopic-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  cursor: pointer;
  font-size: 0.85rem;
  color: #cbd5e1;
  text-transform: none;
  letter-spacing: normal;
  margin: 0;
}

.zp-subtopic-row:hover {
  color: #ffffff;
}

.zp-subtopic-row input[type=checkbox] {
  width: 15px;
  height: 15px;
  accent-color: #2563eb;
  cursor: pointer;
}

/* ============================================================
   BOTTOM FILTER CARD (DIFFICULTY & YEARS) — Exact Zenith Replica
   ============================================================ */

.zp-filter-box {
  background: #11182d;
  border: 1px solid #202e4d;
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 24px;
}

.zp-filter-sec {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.zp-filter-heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #64748b;
  text-transform: uppercase;
}

.zp-pill-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.zp-filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  background: #141c33;
  border: 1px solid #25365c;
  color: #94a3b8;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.zp-filter-pill:hover {
  border-color: #38bdf8;
  color: #ffffff;
}

.zp-filter-pill input {
  display: none;
}

.zp-filter-pill.active {
  background: #1c2c54;
  border-color: #3b82f6;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.zp-pill-tick {
  font-size: 0.75rem;
  color: #60a5fa;
  font-weight: 700;
}

/* Settings Bar */
.zp-settings-bar {
  background: #11182d;
  border: 1px solid #202e4d;
  border-radius: 14px;
  padding: 20px 22px;
}

.zp-settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid #1a2542;
}

.zp-setting-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.zp-setting-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #64748b;
  margin: 0;
}

.zp-count-pills {
  display: flex;
  gap: 6px;
}

.zp-cnt-btn {
  padding: 8px 14px;
  border-radius: 8px;
  background: #141c33;
  border: 1px solid #24355a;
  color: #cbd5e1;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.zp-cnt-btn:hover {
  border-color: #38bdf8;
  color: #ffffff;
}

.zp-cnt-btn.active {
  background: #2563eb;
  border-color: #2563eb;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.zp-toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: #cbd5e1;
  cursor: pointer;
  margin: 0;
  text-transform: none;
  letter-spacing: normal;
}

.zp-toggle-label input[type=checkbox] {
  width: 17px;
  height: 17px;
  accent-color: #2563eb;
  cursor: pointer;
}

.zp-submit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.zp-summary-text {
  display: flex;
  flex-direction: column;
}

.zp-summary-text b {
  font-size: 1rem;
  color: #ffffff;
}

.zp-btn-start {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 10px;
  background: #2563eb;
  border: none;
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.45);
  transition: all 0.15s ease;
  min-width: 220px;
}

.zp-btn-start:hover:not(:disabled) {
  background: #1d4ed8;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
  transform: translateY(-1px);
}

.zp-btn-start:disabled {
  opacity: 0.4;
  background: #182342;
  border: 1px solid #24355a;
  color: #64748b;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.zp-btn-desc {
  font-size: 0.725rem;
  font-weight: 400;
  opacity: 0.85;
}

/* Brand Group in Header */
.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.badge-syll {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.2);
  border: 1px solid rgba(37, 99, 235, 0.4);
  color: #93c5fd;
}

.user-greeting {
  font-size: 0.85rem;
  font-weight: 600;
  color: #f8fafc;
}

.btn-logout {
  color: #94a3b8;
  font-size: 0.825rem;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.15s;
}
.btn-logout:hover {
  color: #ef4444;
}

@media (max-width: 700px) {
  .zp-mode-cards {
    grid-template-columns: 1fr;
  }
  .zp-settings-row {
    flex-direction: column;
    align-items: stretch;
  }
  .zp-submit-row {
    flex-direction: column;
    align-items: stretch;
  }
  .zp-btn-start {
    width: 100%;
  }
}

/* Selection clarity: a checked chapter row highlights so deselect is obvious. */
.zp-chapter-item:has(.chap:checked) .zp-chapter-row {
  background: rgba(37, 99, 235, 0.12);
  border-left: 3px solid #3b82f6;
}
.zp-chapter-item:has(.chap:checked) .zp-chapter-title {
  color: #60a5fa;
}
.zp-subtopic-row:has(input:checked) .zp-subtopic-title {
  color: #60a5fa;
}

/* ===== brand logo ===== */
img.brand-logo {
  display: inline-block;
  vertical-align: middle;
  filter: drop-shadow(0 0 6px rgba(59, 130, 246, 0.3));
}

/* ===== paper preview: stat cards + subject sections ===== */
.kv {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.kv .card {
  text-align: center;
  padding: 16px 12px;
}
.kv .card b {
  display: block;
  font-size: 1.5rem;
  margin-top: 4px;
}
.grid2 {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
  margin: 16px 0;
}
@media (max-width: 760px) {
  .grid2 { grid-template-columns: 1fr; }
}
.subj-sec { margin-bottom: 12px; }
.subj-sec h3 { margin-bottom: 8px; }
.ch-list {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 2;
  font-size: 0.85rem;
  color: var(--text-main);
}
.ch-list li { margin-bottom: 4px; }
.ch-list li::before { content: "• "; color: var(--text-dim); }
@media (max-width: 560px) {
  .ch-list { columns: 1; }
}