/* ==============================
   Colors — 1920s Gazette
   ============================== */
:root {
  --paper-base: #ECE2CC;
  --paper-light: #F5EEDC;
  --paper-dark: #DCCBA3;
  --ink-black: #2B2521;
  --ink-sepia: #5C4632;
  --ink-red: #8C2F1E;
  --brass: #A9812E;
  --coffee-stain: #6F4E2E;
  --coffee-stain-dark: #45301B;
  --wax-seal: #7A1F1F;
  --shadow-soft: rgba(43, 37, 33, 0.18);
  --shadow-hard: rgba(43, 37, 33, 0.45);

  --step-masthead: clamp(2.8rem, 6vw, 5.5rem);
  --step-headline: clamp(1.6rem, 3vw, 2.4rem);
  --step-deck: 1.15rem;
  --step-body: 1rem;
  --step-caption: 0.8rem;
  --tracking-caps: 0.08em;
}

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

html { height: 100%; }

body {
  height: 100%;
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  background-color: var(--paper-dark);
  background-image:
    radial-gradient(circle at 15% 25%, rgba(43,37,33,0.12) 0%, transparent 35%),
    radial-gradient(circle at 85% 75%, rgba(43,37,33,0.08) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--ink-sepia);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ==============================
   Page Container
   ============================== */
.page-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

/* ==============================
   Masthead
   ============================== */
.masthead {
  text-align: center;
  padding: 2rem 0 1.5rem;
  margin-bottom: 2rem;
  position: relative;
}

.masthead-rule {
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--brass) 20%,
    var(--ink-black) 50%,
    var(--brass) 80%,
    transparent 100%
  );
  opacity: 0.7;
  margin-bottom: 1rem;
}

.masthead-rule:last-child {
  margin-top: 1rem;
  margin-bottom: 0;
}

.masthead-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: var(--step-masthead);
  font-weight: 900;
  color: var(--ink-black);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.masthead-dateline {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--ink-sepia);
  letter-spacing: var(--tracking-caps);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.masthead-separator {
  color: var(--brass);
  font-weight: 700;
}

/* ==============================
   Paper / Inner Card
   ============================== */
.paper {
  background-color: var(--paper-base);
  border-radius: 3px;
  box-shadow:
    0 2px 8px var(--shadow-soft),
    0 12px 40px var(--shadow-hard),
    inset 0 0 0 1px rgba(43,37,33,0.08);
  position: relative;
  overflow: hidden;
  min-height: 70vh;
}

/* Paper grain texture */
.paper::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  pointer-events: none;
  z-index: 0;
}

.paper > * { position: relative; z-index: 1; }

/* Foxing — age spots near edges */
.paper::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80px 60px at 95% 5%, rgba(92,70,50,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 60px 80px at 5% 90%, rgba(92,70,50,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40px 40px at 3% 30%, rgba(92,70,50,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50px 30px at 92% 80%, rgba(92,70,50,0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ==============================
   Coffee Stains (scattered)
   ============================== */
.coffee-stain {
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle,
    transparent 52%,
    rgba(111,78,46,0.07) 55%,
    rgba(111,78,46,0.18) 61%,
    rgba(111,78,46,0.05) 66%,
    transparent 70%
  );
  mix-blend-mode: multiply;
  z-index: 0;
}

.coffee-stain--tl {
  top: -20px;
  left: -30px;
  transform: rotate(-12deg);
}

.coffee-stain--br {
  bottom: -25px;
  right: -20px;
  width: 160px;
  height: 160px;
  transform: rotate(18deg);
}

/* ==============================
   Crease shadow
   ============================== */
.crease {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    transparent 40%,
    rgba(0,0,0,0.06) 49%,
    rgba(0,0,0,0.06) 51%,
    transparent 60%
  );
}

/* ==============================
   Type Classes
   ============================== */
.font-masthead { font-family: 'Playfair Display', Georgia, serif; }
.font-body    { font-family: 'Source Serif 4', Georgia, serif; }
.font-type    { font-family: 'Special Elite', 'Courier New', monospace; }
.text-caps    { text-transform: uppercase; letter-spacing: var(--tracking-caps); }
.text-ink     { color: var(--ink-black); }
.text-faded   { color: var(--ink-sepia); }

/* ==============================
   Landing Screen
   ============================== */
.landing {
  padding: 2.5rem 2.5rem 3rem;
}

.landing-header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px double var(--brass);
}

.landing-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: var(--step-headline);
  font-weight: 900;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.landing-subtitle {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: var(--step-deck);
  color: var(--ink-sepia);
  line-height: 1.5;
  max-width: 560px;
  margin: 0 auto;
}

.landing-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: var(--step-caption);
  color: var(--ink-sepia);
  letter-spacing: 0.05em;
}

.landing-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.landing-meta .sep {
  color: var(--brass);
}

/* Stats cards — like classified columns */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.stat-box {
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 2px;
  padding: 1.2rem 1rem;
  text-align: center;
  position: relative;
}

.stat-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--brass);
  opacity: 0.5;
}

.stat-value {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--ink-black);
  line-height: 1;
}

.stat-label {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.4rem;
}

/* Mode selector — like section headers */
.mode-section {
  margin: 2.5rem 0;
}

.section-header {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-align: center;
  position: relative;
  margin-bottom: 1.5rem;
}

.section-header::before,
.section-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brass), transparent);
  position: absolute;
  top: 50%;
  width: 100%;
}

.section-header span {
  background: var(--paper-base);
  padding: 0 1rem;
  position: relative;
  z-index: 1;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.mode-card {
  background: var(--paper-light);
  border: 1.5px solid rgba(43,37,33,0.2);
  border-radius: 2px;
  padding: 1.75rem 1.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.mode-card:hover {
  border-color: var(--brass);
  box-shadow: 0 3px 12px var(--shadow-soft);
}

.mode-card.selected {
  border-color: var(--ink-red);
  background: rgba(140,47,30,0.05);
}

.mode-card.selected::after {
  content: "✓";
  position: absolute;
  top: 0.75rem;
  right: 0.9rem;
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 900;
  color: var(--ink-red);
  font-size: 1.1rem;
}

.mode-icon {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--ink-black);
  margin-bottom: 0.5rem;
  line-height: 1;
}

.mode-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.mode-desc {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  line-height: 1.5;
}

/* Topic filter */
.topic-section {
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 2px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.topic-label {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  display: block;
}

.topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.topic-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

.topic-row:hover { border-color: var(--brass); }

.topic-row:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.topic-row.selected {
  background: rgba(43,37,33,0.05);
  border-color: var(--ink-black);
  color: var(--ink-black);
  font-weight: 600;
}

.topic-row input[type="checkbox"] {
  accent-color: var(--ink-black);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.topic-count {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--ink-sepia);
  margin-left: auto;
  opacity: 0.7;
}

/* ==============================
   Exam Hall — package cards
   ============================== */
.hall-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hall-card {
  background: var(--paper-light);
  border: 1.5px solid rgba(43,37,33,0.2);
  border-radius: 2px;
  padding: 1.75rem 2rem;
  position: relative;
  transition: all 0.2s ease;
}

.hall-card:hover {
  border-color: var(--brass);
  box-shadow: 0 3px 14px var(--shadow-soft);
}

.hall-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.4rem;
}

.hall-card-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hall-card-edition {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--wax-seal);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.hall-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.78rem;
  color: var(--ink-sepia);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.hall-meta .sep { color: var(--brass); }

.hall-desc {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.92rem;
  color: var(--ink-sepia);
  line-height: 1.55;
  margin-bottom: 0.9rem;
}

.hall-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.hall-topic {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  background: var(--paper-base);
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 1px;
  color: var(--ink-sepia);
}

.hall-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: flex-start;
}

.hall-btn { margin-top: 0.25rem; }

.hall-ghost {
  padding: 0.55rem 1.1rem;
  background: transparent;
  color: var(--ink-sepia);
  border: 1.5px solid rgba(43,37,33,0.3);
  border-radius: 2px;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.hall-ghost:hover { border-color: var(--ink-black); color: var(--ink-black); }

.hall-ghost--center { display: block; margin: 1.25rem auto 0; }

.hall-history {
  width: 100%;
  margin-top: 0.4rem;
  padding-top: 0.9rem;
  border-top: 1px dashed rgba(43,37,33,0.2);
}

.hall-history-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.hall-history-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--ink-sepia);
  padding: 0.25rem 0;
}

.hall-hr-label { min-width: 130px; }

.hall-hr-val { color: var(--ink-black); }

.hall-link {
  background: none;
  border: none;
  padding: 0;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--wax-seal);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.hall-link:hover { color: var(--ink-red); }

@media (max-width: 640px) {
  .hall-card { padding: 1.25rem 1rem; }
  .hall-card-head { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .hall-hr-label { min-width: 0; }
}

/* ==============================
   Mermaid diagram frames
   ============================== */
.diagram-block {
  margin: 1.1rem 0 1.4rem;
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 2px;
  padding: 1rem;
}

.diagram-block pre.mermaid {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  overflow-x: auto;
  display: flex;
  justify-content: center;
}

.diagram-block pre.mermaid svg {
  max-width: 100%;
  height: auto;
}

.mermaid-frame {
  display: flex;
  justify-content: center;
}

.mermaid-frame svg {
  max-width: 100%;
  height: auto;
}

.diagram-caption {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.72rem;
  color: var(--ink-sepia);
  text-align: center;
  margin-top: 0.6rem;
  letter-spacing: 0.05em;
}

pre.mermaid.mermaid-error {
  border: 1px dashed var(--ink-red);
  color: var(--ink-red);
  background: rgba(140,47,30,0.05);
}

pre.mermaid.mermaid-offline {
  background: rgba(43,37,33,0.04);
  border: 1px solid rgba(43,37,33,0.1);
  border-radius: 2px;
  padding: 0.75rem;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.78rem;
  white-space: pre-wrap;
}

.diagram-block--review { margin: 0.5rem 0 0.75rem; padding: 0.75rem; }

/* ==============================
   Buttons
   ============================== */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 2rem;
  background: var(--ink-black);
  color: var(--paper-light);
  border: 2px solid var(--ink-black);
  border-radius: 2px;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--ink-red);
  border-color: var(--ink-red);
  color: var(--paper-light);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary:disabled:hover {
  background: var(--ink-black);
  border-color: var(--ink-black);
}

/* ==============================
   Exam Screen — Header
   ============================== */
.exam-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 2px double var(--brass);
  background: rgba(0,0,0,0.02);
  position: sticky;
  top: 0;
  z-index: 10;
}

.exam-brand {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.mode-tag {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--ink-sepia);
  border-radius: 1px;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.mode-tag.exam { border-color: var(--wax-seal); color: var(--wax-seal); }
.mode-tag.practice { border-color: var(--brass); color: var(--brass); }

.timer-box {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 1rem;
  font-weight: 400;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--ink-sepia);
  border-radius: 1px;
  color: var(--ink-black);
  letter-spacing: 0.05em;
}

.timer-box.warning { color: var(--wax-seal); animation: pulse 1.5s infinite; }
.timer-box.danger  { color: var(--ink-red); animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

/* ==============================
   Exam Screen — Main Grid
   ============================== */
.exam-main {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
  padding: 1.5rem;
}

/* Question panel */
.q-panel {
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.12);
  border-radius: 2px;
  padding: 1.75rem 2rem;
}

.q-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(43,37,33,0.12);
}

.q-number {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.78rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.q-tags {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.q-topic {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  background: var(--paper-dark);
  border: 1px solid rgba(43,37,33,0.15);
  border-radius: 1px;
  color: var(--ink-sepia);
}

.diff-tag {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
  border-radius: 1px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.diff-E { background: rgba(85,97,60,0.15); color: #3d4a28; }
.diff-M { background: rgba(169,129,46,0.2); color: #7a5a1e; }
.diff-H { background: rgba(140,47,30,0.1); color: var(--ink-red); }

/* Question text */
.q-text {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.05rem;
  color: var(--ink-sepia);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.q-text code {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.9em;
  background: rgba(43,37,33,0.06);
  padding: 0.1em 0.4em;
  border-radius: 2px;
  color: var(--ink-black);
}

.q-text pre {
  background: rgba(43,37,33,0.04);
  border: 1px solid rgba(43,37,33,0.1);
  border-radius: 2px;
  padding: 1rem;
  margin: 1rem 0;
  overflow-x: auto;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--ink-black);
}

/* Options */
.options { display: flex; flex-direction: column; gap: 0.6rem; }

.opt {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 0.9rem 1rem;
  background: var(--paper-base);
  border: 1.5px solid rgba(43,37,33,0.18);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.opt:hover:not(.disabled) {
  border-color: var(--brass);
  background: var(--paper-light);
}

.opt.selected { border-color: var(--ink-black); background: rgba(43,37,33,0.05); }
.opt.correct { border-color: #4a7c3f; background: rgba(74,124,63,0.08); }
.opt.incorrect { border-color: var(--ink-red); background: rgba(140,47,30,0.06); }
.opt.disabled { cursor: default; opacity: 0.8; }

.opt-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--paper-dark);
  border: 1px solid rgba(43,37,33,0.2);
  border-radius: 2px;
  color: var(--ink-sepia);
}

.opt.selected .opt-letter { background: var(--ink-black); color: var(--paper-light); border-color: var(--ink-black); }
.opt.correct .opt-letter { background: #4a7c3f; color: white; border-color: #4a7c3f; }
.opt.incorrect .opt-letter { background: var(--ink-red); color: white; border-color: var(--ink-red); }

.opt-text {
  flex: 1;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  color: var(--ink-sepia);
  line-height: 1.5;
}

.opt-text code {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.88em;
  background: rgba(43,37,33,0.05);
  padding: 0.05em 0.3em;
  border-radius: 2px;
}

/* Explanation box */
.explain-box {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--paper-dark);
  border-left: 3px solid var(--brass);
  border-radius: 1px;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  line-height: 1.6;
}

.explain-box strong {
  font-family: 'Playfair Display', Georgia, serif;
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.explain-box.correct-verdict strong { color: #4a7c3f; }
.explain-box.incorrect-verdict strong { color: var(--ink-red); }

/* Navigation buttons */
.q-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(43,37,33,0.12);
}

.btn-ghost {
  padding: 0.65rem 1.25rem;
  background: transparent;
  color: var(--ink-sepia);
  border: 1.5px solid rgba(43,37,33,0.3);
  border-radius: 2px;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-ghost:hover:not(:disabled) {
  border-color: var(--ink-black);
  color: var(--ink-black);
}

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

.btn-mark {
  padding: 0.65rem 1.25rem;
  background: transparent;
  color: var(--ink-sepia);
  border: 1.5px solid rgba(43,37,33,0.3);
  border-radius: 2px;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-mark.marked {
  background: var(--ink-black);
  color: var(--paper-light);
  border-color: var(--ink-black);
}

.btn-mark:hover { border-color: var(--ink-black); }

.btn-submit {
  padding: 0.9rem 1.5rem;
  background: var(--wax-seal);
  color: var(--paper-light);
  border: 2px solid var(--wax-seal);
  border-radius: 2px;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  width: 100%;
  margin-top: 1.25rem;
  transition: all 0.2s ease;
}

.btn-submit:hover { background: var(--ink-red); border-color: var(--ink-red); }

/* ==============================
   Palette (Question Grid)
   ============================== */
.q-palette {
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.12);
  border-radius: 2px;
  padding: 1.25rem;
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}

.palette-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-align: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(43,37,33,0.12);
}

.palette-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.palette-stat {
  background: var(--paper-base);
  border: 1px solid rgba(43,37,33,0.1);
  border-radius: 2px;
  padding: 0.6rem;
  text-align: center;
}

.p-stat-val {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--ink-black);
}

.p-stat-lbl {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.68rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.palette-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.7rem;
  color: var(--ink-sepia);
  margin-bottom: 1rem;
}

.leg-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.leg-dot {
  width: 10px;
  height: 10px;
  border-radius: 1px;
  flex-shrink: 0;
}

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

.p-btn {
  aspect-ratio: 1;
  background: var(--paper-base);
  border: 1px solid rgba(43,37,33,0.2);
  border-radius: 2px;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink-sepia);
  cursor: pointer;
  transition: all 0.12s ease;
}

.p-btn:hover { border-color: var(--ink-black); }

.p-btn.current {
  background: var(--ink-black);
  color: var(--paper-light);
  border-color: var(--ink-black);
}

.p-btn.answered { background: rgba(74,124,63,0.2); border-color: #4a7c3f; color: #3d5c2e; }
.p-btn.marked { border-color: var(--brass); }
.p-btn.answered-marked { background: rgba(74,124,63,0.2); border-color: #4a7c3f; color: #3d5c2e; }

/* ==============================
   Confirm Dialog
   ============================== */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(43,37,33,0.6);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.confirm-box {
  background: var(--paper-base);
  border: 2px solid var(--ink-black);
  border-radius: 2px;
  padding: 2rem;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.confirm-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.confirm-body {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  color: var(--ink-sepia);
  line-height: 1.6;
  white-space: pre-line;
  margin-bottom: 1.5rem;
}

.confirm-actions {
  display: flex;
  gap: 1rem;
}

.confirm-actions .btn-ghost { flex: 1; text-align: center; }

.confirm-actions .btn-submit { margin-top: 0; flex: 1; }

/* ==============================
   Results
   ============================== */
.results-wrap { padding: 2.5rem 2.5rem 3rem; }

.score-main {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 5rem;
  font-weight: 900;
  color: var(--ink-black);
  line-height: 1;
}

.score-label {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

.scorecard-header {
  text-align: center;
  padding-bottom: 1.5rem;
  border-bottom: 2px double var(--brass);
  margin-bottom: 1.5rem;
}

.scorecard-header .masthead-rule {
  margin-top: 1rem;
  margin-bottom: 0;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.score-cell {
  background: var(--paper-light);
  border: 1px solid rgba(43,37,33,0.12);
  border-radius: 2px;
  padding: 1rem;
  text-align: center;
}

.score-cell-val {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--ink-black);
}

.score-cell-lbl {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.7rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
}

/* Breakdown */
.section-divider {
  border: none;
  border-top: 1px solid rgba(43,37,33,0.15);
  margin: 2rem 0;
}

.section-heading {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--ink-black);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1.5px solid var(--brass);
}

.breakdown-item {
  margin-bottom: 1rem;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  margin-bottom: 0.3rem;
}

.breakdown-name { font-weight: 600; color: var(--ink-black); }
.breakdown-pct  { font-family: 'Special Elite', 'Courier New', monospace; font-size: 0.8rem; }

.breakdown-bar {
  height: 8px;
  background: var(--paper-dark);
  border-radius: 1px;
  overflow: hidden;
}

.breakdown-fill {
  height: 100%;
  border-radius: 1px;
  transition: width 0.5s ease;
}

.fill-good  { background: #4a7c3f; }
.fill-ok    { background: var(--brass); }
.fill-poor  { background: var(--ink-red); }

/* Review */
.review-filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.rv-btn {
  padding: 0.4rem 0.8rem;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.78rem;
  border: 1px solid rgba(43,37,33,0.25);
  border-radius: 1px;
  background: transparent;
  color: var(--ink-sepia);
  cursor: pointer;
  transition: all 0.15s ease;
}

.rv-btn.active {
  background: var(--ink-black);
  color: var(--paper-light);
  border-color: var(--ink-black);
}

.rv-btn:hover:not(.active) { border-color: var(--ink-black); color: var(--ink-black); }

.review-list { display: flex; flex-direction: column; gap: 0; }

.review-item {
  padding: 1.2rem 0;
  border-bottom: 1px solid rgba(43,37,33,0.1);
}

.review-item:last-child { border-bottom: none; }

.review-q {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  color: var(--ink-sepia);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.review-q code {
  font-family: 'Special Elite', 'Courier New', monospace;
  background: rgba(43,37,33,0.05);
  padding: 0.05em 0.3em;
  border-radius: 2px;
}

.review-q pre {
  background: rgba(43,37,33,0.03);
  border: 1px solid rgba(43,37,33,0.08);
  border-radius: 2px;
  padding: 0.75rem;
  margin: 0.5rem 0;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  overflow-x: auto;
}

.review-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.rv-tag {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 1px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.rv-tag.yours        { background: var(--paper-dark); color: var(--ink-sepia); }
.rv-tag.correct-tag  { background: rgba(74,124,63,0.15); color: #3d5c2e; }
.rv-tag.wrong-tag    { background: rgba(140,47,30,0.1); color: var(--ink-red); }
.rv-tag.skipped-tag  { background: rgba(169,129,46,0.15); color: #7a5a1e; }
.rv-tag.correct-ans  { background: rgba(74,124,63,0.12); color: #3d5c2e; }
.rv-tag.topic-tag    { background: transparent; color: var(--ink-sepia); border: 1px solid rgba(43,37,33,0.15); }

/* Restart button */
.btn-restart {
  display: block;
  margin: 2rem auto 0;
  padding: 0.9rem 2.5rem;
  background: var(--ink-black);
  color: var(--paper-light);
  border: 2px solid var(--ink-black);
  border-radius: 2px;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.05rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-restart:hover { background: var(--ink-red); border-color: var(--ink-red); color: var(--paper-light); }

/* ==============================
   Confetti (subtle — old paper shapes)
   ============================== */
.confetti {
  position: fixed;
  top: -10px;
  width: 10px;
  height: 10px;
  pointer-events: none;
  z-index: 1000;
  animation: confetti-fall 3s linear forwards;
  opacity: 0.7;
}

@keyframes confetti-fall {
  to {
    transform: translateY(110vh) rotate(720deg);
    opacity: 0;
  }
}

/* ==============================
   Alert / Modal
   ============================== */
.alert-box {
  background: var(--paper-base);
  border: 2px solid var(--wax-seal);
  border-radius: 2px;
  padding: 1.5rem 2rem;
  text-align: center;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1rem;
  color: var(--ink-black);
  max-width: 360px;
  margin: 1rem auto;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.alert-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.5rem;
}

/* ==============================
   Responsive
   ============================== */
@media (max-width: 860px) {
  .exam-main { grid-template-columns: 1fr; }
  .q-palette {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 640px) {
  .page-container { padding: 1rem 0.75rem 2rem; }
  .exam-main { padding: 1rem; }
  .q-panel { padding: 1.25rem 1rem; }
  .q-text { font-size: 0.95rem; }
  .mode-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .score-grid { grid-template-columns: repeat(2, 1fr); }
  .palette-grid { grid-template-columns: repeat(6, 1fr); }
  .landing { padding: 1.5rem 1rem 2rem; }
  .results-wrap { padding: 1.5rem 1rem 2rem; }
  .score-main { font-size: 3.5rem; }
  .masthead-title { font-size: clamp(2rem, 8vw, 3rem); }

  /* Exam header: wrap instead of overflow */
  .exam-header { flex-wrap: wrap; gap: 0.5rem; padding: 0.75rem 1rem; }
  .exam-brand { font-size: 1rem; }
  .timer-box { white-space: nowrap; margin-left: auto; }

  /* Question meta and tags stack */
  .q-meta { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .q-tags { flex-wrap: wrap; }

  /* Question actions: wrap, full-width buttons */
  .q-actions { flex-wrap: wrap; gap: 0.5rem; }
  .q-actions .btn-ghost,
  .q-actions .btn-mark { flex: 1 1 auto; min-width: 105px; text-align: center; }

  /* Options comfortable touch targets */
  .opt { padding: 0.8rem 0.85rem; }

  /* Explanation box readable on small screens */
  .explain-box { font-size: 0.85rem; padding: 0.9rem 1rem; }

  /* Hall card buttons full width */
  .hall-actions .btn-primary,
  .hall-actions .hall-ghost { width: 100%; text-align: center; justify-content: center; }
  .hall-history-row { flex-wrap: wrap; }

  /* Inline question tables scroll horizontally instead of blowing up the layout */
  table { display: block; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }

  /* Mermaid diagrams shrink to fit */
  .diagram-block { padding: 0.6rem; overflow-x: auto; }
  .mermaid-frame svg, .diagram-block svg { max-width: 100%; height: auto; }

  /* Sticky palette removed; make it a normal block below the question */
  .q-palette { margin-top: 1rem; }
}

@media (max-width: 480px) {
  .confirm-actions { flex-direction: column; }
  .confirm-actions .btn-ghost,
  .confirm-actions .btn-submit { width: 100%; }
  .landing-meta { gap: 0.6rem; flex-wrap: wrap; }
  .masthead-dateline { font-size: 0.75rem; gap: 0.3rem; }
  .palette-grid { grid-template-columns: repeat(5, 1fr); }
  .score-main { font-size: 3rem; }
}

/* ==============================
   Scrollbar
   ============================== */
::-webkit-scrollbar { width: 7px; }
::-webkit-scrollbar-track { background: var(--paper-dark); }
::-webkit-scrollbar-thumb { background: rgba(43,37,33,0.3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(43,37,33,0.5); }

/* ==============================
   WRITTEN QUESTIONS — answer production & sheet
   ============================== */
.written-block {
  margin-top: 0.5rem;
}

.written-prompt {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.marks-tag {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  background: var(--paper-dark);
  border: 1px solid rgba(43,37,33,0.25);
  border-radius: 1px;
  color: var(--ink-black);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.written-hint {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--ink-sepia);
}

.answer-area {
  width: 100%;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink-black);
  background: var(--paper-light);
  border: 1.5px solid rgba(43,37,33,0.25);
  border-radius: 2px;
  padding: 0.9rem 1rem;
  resize: vertical;
  outline: none;
  box-shadow: inset 0 1px 3px rgba(43,37,33,0.08);
}

.answer-area:focus {
  border-color: var(--ink-black);
  box-shadow: inset 0 1px 3px rgba(43,37,33,0.08), 0 0 0 2px rgba(43,37,33,0.12);
}

.written-count {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.7rem;
  color: var(--ink-sepia);
  margin-top: 0.35rem;
  text-align: right;
  opacity: 0.8;
}

/* palette marker for written questions */
.p-btn.written-q {
  border-style: dotted;
  border-color: rgba(43,37,33,0.45);
}

.p-btn.written-q.answered {
  border-style: solid;
  background: rgba(169,129,46,0.18);
  border-color: var(--brass);
  color: #6b4f1a;
}

.p-btn.written-q.current {
  border-style: solid;
}

/* results note */
.written-note {
  margin-top: 1.25rem;
  padding: 0.9rem 1.1rem;
  background: rgba(169,129,46,0.12);
  border-left: 3px solid var(--brass);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  line-height: 1.55;
}

/* written answer sheet */
.written-sheet {
  padding: 2rem 2.25rem;
  margin-bottom: 1.5rem;
}

.student-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.student-row label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--ink-sepia);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.student-input {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  color: var(--ink-black);
  background: var(--paper-light);
  border: 1.5px solid rgba(43,37,33,0.25);
  border-radius: 2px;
  padding: 0.55rem 0.75rem;
  outline: none;
}

.student-input:focus { border-color: var(--ink-black); }

.sheet-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.sheet-actions .btn-submit {
  width: auto;
  margin-top: 0;
  flex: 1 1 auto;
}

.sheet-hint {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.72rem;
  color: var(--ink-sepia);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.written-list { display: flex; flex-direction: column; gap: 1.5rem; }

.written-item {
  padding-top: 1rem;
  border-top: 1px solid rgba(43,37,33,0.12);
}

.written-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.written-item-q {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.95rem;
  color: var(--ink-sepia);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.written-item-q pre {
  background: rgba(43,37,33,0.03);
  border: 1px solid rgba(43,37,33,0.08);
  border-radius: 2px;
  padding: 0.75rem;
  margin: 0.5rem 0;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 0.85rem;
  overflow-x: auto;
}

.sheet-area { background: var(--paper-base); }

/* written review block */
.review-written {
  margin-top: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: var(--paper-light);
  border-left: 3px solid var(--brass);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  color: var(--ink-sepia);
  line-height: 1.6;
  white-space: pre-wrap;
}

@media (max-width: 640px) {
  .written-sheet { padding: 1.25rem 1rem; }
  .student-row { grid-template-columns: 1fr; }
  .sheet-actions { flex-direction: column; }
  .sheet-actions .btn-submit,
  .sheet-actions .btn-ghost { width: 100%; }
}