/* ================================================
   Hephaestus Quant · Styles
   ================================================ */

:root {
  --bg: #0B0D10;
  --surface: #111318;
  --surface-hover: #181B22;
  --border: rgba(184, 156, 75, 0.07);
  --border-strong: rgba(184, 156, 75, 0.16);
  --text: #ccccd4;
  --text-heading: #e8e8ef;
  --text-secondary: #858592;
  --muted: #555564;
  --accent: #B89C4B;
  --accent-hover: #C2A75E;
  --accent-dim: rgba(184, 156, 75, 0.08);
  --accent-strong: #A8842C;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Fira Code', 'SF Mono', ui-monospace, monospace;
  --max-w: 1060px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100vh;
}

/* Film grain: adds analog texture, kills the clinical flat look */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Typography ---- */

h1, h2, h3, h4, h5 {
  color: var(--text-heading);
  font-weight: 500;
  line-height: 1.2;
}

/* Mono h1: gives the site a technical identity instead of generic startup */
h1 {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h2 {
  font-size: 1.3rem;
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.02rem;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.005em;
}

p {
  max-width: 640px;
}

p + p {
  margin-top: var(--space-sm);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

ul, ol {
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.4rem;
}

/* ---- Semantic gold (principle-level signal words) ---- */

.signal {
  color: var(--accent);
}

/* ---- Labels ---- */

.label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  display: block;
  margin-bottom: var(--space-xs);
}

/* ---- Layout ---- */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border);
}

section:last-of-type {
  border-bottom: none;
}

/* ---- Header ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 13, 16, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.site-name {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-heading);
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.site-name:hover {
  color: var(--accent);
}

nav {
  display: flex;
  gap: 1.8rem;
  align-items: center;
}

nav a {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

nav a:hover,
nav a.active {
  color: var(--text-heading);
}

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.4rem;
  line-height: 0;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  margin: 4px 0;
  transition: 0.2s;
}

/* ---- Footer ---- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ---- Hero ---- */

.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
}

/* Hero with subtle background texture */
.hero-bg {
  position: relative;
  overflow: hidden;
}

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

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: var(--hero-bg);
  background-size: cover;
  background-position: center;
  opacity: 0.06;
  -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
  pointer-events: none;
}

.hero h1 {
  margin-bottom: var(--space-md);
  max-width: 720px;
}

.hero h1::after {
  content: '';
  display: block;
  width: 48px;
  height: 1px;
  background: var(--accent);
  margin-top: var(--space-sm);
  opacity: 0.6;
}

.hero .subtitle {
  font-size: 1.02rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.65;
}

.hero .meta {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

/* ---- Cards ---- */

.card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 4px;
  padding: var(--space-md);
  transition: border-color 0.3s;
}

.card:hover {
  border-color: rgba(184, 156, 75, 0.15);
}

.card h3 {
  font-size: 0.98rem;
  margin-bottom: var(--space-xs);
}

.card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ---- Grids ---- */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* ---- Button ---- */

.btn {
  display: inline-block;
  padding: 0.6rem 1.3rem;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-mono);
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  color: var(--text);
  text-decoration: none;
  transition: all 0.2s;
  background: transparent;
  cursor: pointer;
  letter-spacing: 0.01em;
}

.btn:hover {
  background: var(--surface);
  border-color: var(--accent);
  color: var(--text-heading);
}

.btn-primary {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

/* ---- Problem / Item lists ---- */

.item-list {
  list-style: none;
  padding: 0;
}

.item-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

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

.item-list .item-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.2rem;
}

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

.item-list .item-detail {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  display: block;
  max-width: 640px;
}

/* ---- Research problem blocks (Apply page) ---- */

.problem-block {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
  transition: border-color 0.3s;
}

.problem-block:last-child {
  margin-bottom: 0;
}

.problem-block:hover {
  border-color: rgba(184, 156, 75, 0.12);
}

.problem-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
}

.problem-id {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.35rem;
}

.problem-title {
  font-size: 1.05rem;
  margin-bottom: 0;
  color: var(--text-heading);
}

.problem-meta {
  margin: 0;
}

.problem-meta dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: var(--space-sm);
  margin-bottom: 0.25rem;
}

.problem-meta dt:first-child {
  margin-top: 0;
}

.problem-meta dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
  max-width: 640px;
}

.problem-meta dd ul {
  margin-top: 0.35rem;
  padding-left: 1.2rem;
}

.problem-meta dd li {
  margin-bottom: 0.25rem;
}

/* ---- Principles (Doctrine page) ---- */

.principle {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.principle:last-child {
  border-bottom: none;
}

.principle-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-strong);
  margin-bottom: 0.35rem;
}

.principle h3 {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.principle p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ---- Definition list ---- */

.def-grid {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0.6rem var(--space-md);
  font-size: 0.9rem;
}

.def-grid dt {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-top: 0.15rem;
}

.def-grid dd {
  color: var(--text);
}

/* ---- Divider ---- */

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-lg) 0;
}

/* ---- Numbered list with monospace numbers ---- */

.numbered-list {
  list-style: none;
  padding: 0;
  counter-reset: steps;
}

.numbered-list li {
  counter-increment: steps;
  padding: 0.6rem 0;
  padding-left: 2.4rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.numbered-list li::before {
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  top: 0.72rem;
}

/* ---- Section header ---- */

.section-header {
  margin-bottom: var(--space-lg);
}

.section-header .label {
  margin-bottom: var(--space-sm);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: var(--space-sm);
}

/* ---- Inline code ---- */

code {
  font-family: var(--font-mono);
  font-size: 0.83em;
  background: var(--surface);
  padding: 0.12em 0.35em;
  border-radius: 2px;
  border: 1px solid var(--border);
}

/* ---- Two-column text layout ---- */

.text-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.text-two-col p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ---- Accent left border block (for asides/notes) ---- */

.aside-block {
  border-left: 2px solid var(--border-strong);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
}

.aside-block p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ---- Status badge ---- */

.status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.status--active {
  border-color: rgba(184, 156, 75, 0.3);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ---- CTA block ---- */

.cta-block {
  padding: var(--space-lg) 0;
}

.cta-block h2 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.cta-block p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
  :root {
    --space-xl: 4rem;
    --space-2xl: 6rem;
  }

  nav {
    display: none;
  }

  nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(11, 13, 16, 0.97);
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm) var(--space-md) var(--space-md);
    gap: 0.1rem;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  nav.open a {
    padding: 0.6rem 0;
    font-size: 0.88rem;
  }

  .menu-toggle {
    display: block;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .text-two-col {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .def-grid {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .def-grid dt {
    margin-top: var(--space-sm);
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }

  .hero h1 {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1.2rem;
  }
}

/* ================================================
   Auth, Leaderboard, Profile
   ================================================ */

/* ---- Auth UI ---- */

.auth-user {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.auth-avatar-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.auth-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}

.auth-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.7rem;
}

/* ---- Leaderboard table ---- */

.lb-table {
  width: 100%;
  border-collapse: collapse;
}

.lb-table th {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border-strong);
}

.lb-table td {
  font-size: 0.85rem;
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.lb-table tr:hover td {
  background: var(--surface);
}

.lb-rank {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
  width: 40px;
}

.lb-user {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.lb-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.lb-name {
  color: var(--text-heading);
}

.lb-name a {
  color: var(--text-heading);
  text-decoration: none;
}

.lb-name a:hover {
  color: var(--accent);
}

.lb-score {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.lb-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

/* ---- Profile ---- */

.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.profile-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
}

.profile-info h2 {
  margin-bottom: 0.2rem;
}

.profile-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.score-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.score-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: var(--space-sm) var(--space-md);
  text-align: center;
}

.score-card .score-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.2rem;
}

.score-card .score-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---- Empty state ---- */

.empty-state {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--muted);
}

.empty-state p {
  margin: 0 auto;
  font-size: 0.9rem;
}

/* ---- Loading ---- */

.loading {
  text-align: center;
  padding: var(--space-lg) 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---- Responsive: leaderboard + profile ---- */

@media (max-width: 768px) {
  .profile-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .lb-table {
    font-size: 0.78rem;
  }

  .lb-table th, .lb-table td {
    padding: 0.5rem 0.4rem;
  }

  .score-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .auth-user {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }
}

/* ================================================
   80-in-8 drill
   ================================================ */

.eighty-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
  padding: 0.8rem var(--space-md);
  margin-bottom: var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.eighty-status-item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.eighty-status-item .label {
  margin: 0;
}

.eighty-status-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--text-heading);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.eighty-question-card {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  align-items: center;
}

.eighty-question {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  color: var(--text-heading);
  text-align: center;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.eighty-choices {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  width: 100%;
  max-width: 880px;
}

.eighty-choice {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  padding: 1rem 0.6rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.12s;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.eighty-choice:hover {
  border-color: var(--accent);
  color: var(--text-heading);
  background: rgba(184, 156, 75, 0.06);
}

.eighty-choice:active {
  background: rgba(184, 156, 75, 0.12);
}

.eighty-actions {
  display: flex;
  justify-content: center;
  margin-top: 0.4rem;
}

.results-formula {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.4rem;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 720px) {
  .eighty-choices {
    grid-template-columns: 1fr 1fr;
  }
  .eighty-status {
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding: 0.6rem var(--space-sm);
  }
  .eighty-status-value {
    font-size: 1.1rem;
  }
  .eighty-question-card {
    padding: var(--space-xl) var(--space-md);
    gap: var(--space-lg);
  }
}

/* ============================================================
   80-in-8 additions — append to styles.css
   ============================================================ */

/* ---- Timer warning ---- */
.timer-warning {
  color: var(--danger, #e53e3e) !important;
  animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.55; }
}

/* ---- Keyboard hint badge on choices ---- */
.choice-kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  margin-right: 0.5rem;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 3px;
  font-size: 0.65rem;
  font-family: var(--font-mono, monospace);
  opacity: 0.5;
  flex-shrink: 0;
}

/* ---- Score save status ---- */
.score-save-status {
  font-size: 0.8rem;
  font-family: var(--font-mono, monospace);
  opacity: 0.7;
}
.save-ok    { color: var(--success, #38a169); }
.save-warn  { color: var(--warning, #d69e2e); }
.save-error { color: var(--danger,  #e53e3e); }

/* ---- Review table ---- */
#review-section {
  margin-top: var(--space-xl, 3rem);
}

.review-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: var(--space-md, 1rem);
}
.review-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--border, #e2e8f0);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted, #718096);
}
.review-table td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border, #e2e8f0);
  vertical-align: middle;
}
.review-table tr:last-child td { border-bottom: none; }

/* Row tints */
.review-correct { background: rgba(56, 161, 105, 0.05); }
.review-wrong   { background: rgba(229, 62, 62, 0.05); }
.review-skipped { background: transparent; }

.review-num  { color: var(--muted, #718096); font-family: var(--font-mono, monospace); width: 2.5rem; }
.review-q    { font-family: var(--font-mono, monospace); }
.review-ans  { font-family: var(--font-mono, monospace); font-weight: 600; }
.review-chosen { font-family: var(--font-mono, monospace); }
.review-wrong-ans { color: var(--danger, #e53e3e); text-decoration: line-through; }

.review-skipped-label {
  color: var(--muted, #718096);
  font-style: italic;
}

.review-icon { text-align: center; font-weight: 700; width: 2rem; }
.review-icon-correct { color: var(--success, #38a169); }
.review-icon-wrong   { color: var(--danger,  #e53e3e); }
.review-icon-skipped { color: var(--muted,   #718096); }

/* ---- Personal best banner ---- */
.lb-personal {
  display: flex;
  align-items: center;
  gap: var(--space-md, 1rem);
  padding: var(--space-md, 1rem) var(--space-lg, 1.5rem);
  background: var(--surface-alt, #f7fafc);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: var(--radius, 8px);
  margin-bottom: var(--space-lg, 2rem);
  flex-wrap: wrap;
}
.lb-personal .label {
  flex-shrink: 0;
}
.lb-personal-stats {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex: 1;
}
.lb-personal-score {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  line-height: 1;
}
.lb-personal-detail {
  font-size: 0.8rem;
  color: var(--muted, #718096);
  font-family: var(--font-mono, monospace);
}
.lb-personal-cta {
  justify-content: space-between;
}

/* Score colour states */
.score-pass    { color: var(--success, #38a169); }
.score-fail    { color: var(--danger,  #e53e3e); }
.score-neutral { color: var(--text,    #1a202c); }

/* ---- Leaderboard table extras for drill ---- */
.lb-detail {
  font-size: 0.78rem;
  font-family: var(--font-mono, monospace);
  color: var(--muted, #718096);
}
.lb-note {
  font-size: 0.78rem;
  color: var(--muted, #718096);
  font-family: var(--font-mono, monospace);
  margin-bottom: var(--space-md, 1rem);
}

/* ================================================
   Zap-N cognitive test suite
   ================================================ */

/* ---- Progress bar ---- */
.zapn-progress-bar-wrap {
  height: 3px;
  background: var(--border);
  margin-bottom: var(--space-md);
  border-radius: 2px;
  overflow: hidden;
}

.zapn-progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.4s ease;
  width: 0%;
}

/* ---- Game header ---- */
.zapn-game-header {
  margin-bottom: var(--space-md);
}

/* ---- Instruction card ---- */
.zapn-instruction-card {
  max-width: 600px;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) auto var(--space-lg);
  text-align: center;
}

.zapn-hint {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.65;
}

/* ---- Game area ---- */
#zapn-game-area {
  max-width: 820px;
  margin: 0 auto;
}

/* ---- Shared feedback ---- */
.zapn-feedback {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  min-height: 1.4em;
  margin-top: var(--space-sm);
  text-align: center;
  color: var(--text-secondary);
}

.zapn-feedback--good { color: #38a169; }
.zapn-feedback--bad  { color: #e53e3e; }

/* ---- Between-game card ---- */
.zapn-gameover {
  text-align: center;
  padding: var(--space-xl) 0;
}

.zapn-gameover .label {
  display: block;
  margin-bottom: var(--space-xs);
}

/* ---- Results list ---- */
.zapn-scores-list {
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.zapn-result-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-sm);
  align-items: center;
  padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

.zapn-result-row:last-child { border-bottom: none; }

.zapn-result-row:nth-child(odd) { background: var(--surface); }

.zapn-result-name {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-heading);
}

.zapn-result-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.zapn-result-score {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  min-width: 90px;
  text-align: right;
}

/* ================================================
   Game 1 — Stock Master
   ================================================ */
.zapn-sm-wrap {
  text-align: center;
}

.zapn-sm-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.zapn-sm-outer {
  display: inline-block;
  cursor: pointer;
  padding: var(--space-sm);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  user-select: none;
}

.zapn-sm-outer:hover {
  border-color: var(--accent);
}

.zapn-sm-track {
  position: relative;
  width: 80px;
  height: 260px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.zapn-sm-zone {
  position: absolute;
  left: 0;
  right: 0;
  background: rgba(56, 161, 105, 0.28);
  border-top: 2px solid #38a169;
  border-bottom: 2px solid #38a169;
  pointer-events: none;
  z-index: 1;
}

.zapn-sm-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 0%;
  background: var(--accent);
  pointer-events: none;
  z-index: 2;
}

.zapn-sm-click-prompt {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: var(--space-sm) 0 var(--space-xs);
}

.zapn-sm-score {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* ================================================
   Game 2 — Balloon
   ================================================ */
.zapn-bl-wrap {
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
}

.zapn-bl-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.zapn-bl-stage {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 230px;
  padding-bottom: var(--space-sm);
}

.zapn-bl-balloon {
  background: radial-gradient(ellipse at 35% 32%,
    rgba(255,255,255,0.45) 0%,
    var(--accent) 55%,
    var(--accent-strong) 100%);
  border-radius: 50% 50% 52% 48% / 50% 50% 62% 48%;
  transition: width 0.18s ease, height 0.18s ease;
  min-width: 44px;
  min-height: 44px;
}

.zapn-bl-info {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin: var(--space-xs) 0 var(--space-sm);
}

.zapn-bl-btns {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

.zapn-bl-popped {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xl) 0;
}

.zapn-bl-pop-icon { font-size: 3rem; }

.zapn-badge-hot {
  display: inline-block;
  background: rgba(229, 62, 62, 0.12);
  border: 1px solid rgba(229, 62, 62, 0.3);
  color: #e53e3e;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.12rem 0.45rem;
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 0.5rem;
}

/* ================================================
   Game 3 — Skyscraper (glass tubes + 3-D balls)
   ================================================ */
.zapn-sky-wrap { text-align: center; }

.zapn-sky-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.zapn-sky-boards {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.zapn-sky-board {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.zapn-sky-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.zapn-sky-arrow {
  font-size: 1.6rem;
  color: var(--muted);
  padding-top: 5rem;
}

.zapn-sky-stacks {
  display: flex;
  gap: var(--space-md);
  align-items: flex-end;
}

/* ---- tube wrapper ---- */
.sky-tube-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: default;
}

.sky-tube-interactive { cursor: pointer; }

/* ---- glass tube body ---- */
.sky-tube-body {
  position: relative;
  width: 84px;
  height: 300px;
  border: 2px solid rgba(255, 255, 255, 0.18);
  border-bottom: none;
  border-radius: 42px 42px 0 0;
  background:
    linear-gradient(
      to right,
      rgba(255,255,255,0.07) 0%,
      rgba(255,255,255,0.02) 28%,
      rgba(255,255,255,0.01) 72%,
      rgba(255,255,255,0.05) 100%
    );
  display: flex;
  flex-direction: column-reverse; /* first child = bottom of tube */
  align-items: center;
  padding: 10px 8px 8px;
  gap: 3px;
  overflow: hidden;
}

/* left-edge highlight for glass look */
.sky-tube-body::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 28px;
  bottom: 0;
  width: 5px;
  background: rgba(255, 255, 255, 0.13);
  border-radius: 3px 3px 0 0;
  pointer-events: none;
}

.sky-tube-interactive:hover .sky-tube-body {
  border-color: rgba(255, 255, 255, 0.38);
}

/* selected tube — gold outline */
.sky-stack-selected .sky-tube-body {
  border-color: var(--accent) !important;
  box-shadow: 0 0 18px rgba(184, 156, 75, 0.35);
}

/* ---- white base plate ---- */
.sky-tube-base {
  width: 92px;
  height: 15px;
  background: linear-gradient(to bottom, #e8e8e8, #b8b8b8);
  border-radius: 0 0 6px 6px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
}

/* ---- 3-D ball ---- */
.sky-ball {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow:
    0 5px 14px rgba(0, 0, 0, 0.55),
    inset 0 -3px 8px rgba(0, 0, 0, 0.3);
}

/* small ball used in the carrying indicator */
.sky-ball-sm {
  width: 28px;
  height: 28px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

/* top ball of selected tube dims to show it's in-flight */
.sky-ball-lifted {
  opacity: 0.28;
  transform: scale(0.88);
  box-shadow: none;
}

/* carrying-state status bar */
.zapn-sky-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-height: 2.4rem;
  margin-bottom: var(--space-sm);
}

.zapn-sky-status--carrying { color: var(--accent); }

.zapn-sky-hint {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

/* ================================================
   Game 4 — Shapeshift
   ================================================ */
.zapn-sf-wrap { text-align: center; }

.zapn-sf-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.zapn-sf-arena {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  min-height: 120px;
  align-items: center;
  margin-bottom: var(--space-md);
}

.zapn-sf-half {
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border-strong);
  border-radius: 4px;
}

.zapn-sf-shape {
  width: 62px;
  height: 62px;
  background: var(--accent);
}

.zapn-sf-circle  { border-radius: 50%; }

.zapn-sf-rule {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.zapn-sf-btns {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-sm);
}

/* ================================================
   Game 5 — Digit
   ================================================ */
.zapn-dg-wrap {
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
}

.zapn-dg-phase {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.zapn-dg-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.zapn-dg-display {
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: var(--space-md);
}

.zapn-dg-digit {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 10vw, 5rem);
  color: var(--text-heading);
  font-variant-numeric: tabular-nums;
  min-height: 1em;
}

.zapn-dg-instruction {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.zapn-dg-input {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  color: var(--text-heading);
  padding: 0.5rem 1rem;
  text-align: center;
  letter-spacing: 0.18em;
  width: 100%;
  max-width: 300px;
  display: block;
  margin: 0 auto;
}

.zapn-dg-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ================================================
   Game 6 — The Switch
   ================================================ */
.zapn-sw-wrap {
  max-width: 700px;
  margin: 0 auto;
}

.zapn-sw-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-xs);
  text-align: center;
}

.zapn-sw-rule {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-md);
}

.zapn-sw-arena {
  display: flex;
  gap: 0;
  min-height: 130px;
  margin-bottom: var(--space-md);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.zapn-sw-half {
  flex: 1;
  background: var(--surface);
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.zapn-sw-side-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.zapn-sw-divider {
  width: 1px;
  background: var(--border-strong);
  align-self: stretch;
}

.zapn-sw-math {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-heading);
}

.zapn-sw-arrows {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.4;
  text-align: center;
}

.zapn-sw-response {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.zapn-sw-opt { min-width: 80px; }

/* ================================================
   Game 7 — Number Box
   ================================================ */
.zapn-nb-wrap {
  max-width: 560px;
  margin: 0 auto;
}

.zapn-nb-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.zapn-nb-target {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--text-heading);
  margin-bottom: var(--space-sm);
}

.zapn-nb-num {
  color: var(--accent);
  font-size: 1.7rem;
}

.zapn-nb-numbers {
  font-family: var(--font-mono);
  margin-bottom: var(--space-sm);
}

.zapn-nb-tile {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  padding: 0.3rem 0.8rem;
  border-radius: 3px;
  font-size: 1.1rem;
  color: var(--text-heading);
  margin: 0 0.2rem;
}

.zapn-nb-hint {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.zapn-nb-input-row {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.zapn-nb-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1rem;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  color: var(--text-heading);
  padding: 0.5rem 0.8rem;
}

.zapn-nb-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ================================================
   Game 8 — Code Compare
   ================================================ */
.zapn-cc-wrap {
  text-align: center;
  max-width: 540px;
  margin: 0 auto;
}

.zapn-cc-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.zapn-cc-code {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 8vw, 3.8rem);
  color: var(--text-heading);
  letter-spacing: 0.22em;
  margin-bottom: var(--space-sm);
  font-variant-numeric: tabular-nums;
}

.zapn-cc-timer-bar {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: var(--space-md);
}

.zapn-cc-timer-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
}

.zapn-cc-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  max-width: 480px;
  margin: 0 auto;
}

.zapn-cc-opt {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  letter-spacing: 0.16em;
  padding: 0.85rem 1rem;
  font-variant-numeric: tabular-nums;
}

.zapn-cc-opt:hover {
  border-color: var(--accent);
  color: var(--text-heading);
  background: var(--accent-dim);
}

/* ================================================
   Game 9 — Figure It Out
   ================================================ */
.zapn-fi-wrap {
  max-width: 620px;
  margin: 0 auto;
}

.zapn-fi-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: var(--space-xs);
}

.zapn-fi-instruction {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.zapn-fi-selects {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.zapn-fi-sel-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.zapn-fi-sel-group .label {
  min-width: 68px;
  margin: 0;
}

.zapn-fi-opts {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.zapn-fi-opt {
  font-size: 0.78rem;
  padding: 0.28rem 0.65rem;
}

.zapn-fi-opt--selected {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

.zapn-fi-guess-preview {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.zapn-fi-history {
  margin-top: var(--space-md);
  border-top: 1px solid var(--border);
  padding-top: var(--space-sm);
}

.zapn-fi-guess-row {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.3rem 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.zapn-fi-guess-row:last-child { border-bottom: none; }

.zapn-fi-guess-num {
  color: var(--muted);
  min-width: 1.4rem;
}

.zapn-fi-ok  { color: #38a169; font-weight: 700; }
.zapn-fi-bad { color: #e53e3e; font-weight: 700; }

/* ================================================
   Zap-N responsive
   ================================================ */
@media (max-width: 600px) {
  .zapn-sky-boards {
    flex-direction: column;
    align-items: center;
  }

  .zapn-sky-arrow {
    transform: rotate(90deg);
    padding: 0;
    padding-top: 0 !important;
  }

  .sky-tube-body { height: 240px; }
  .sky-ball { width: 48px; height: 48px; }
  .sky-tube-wrap { transform: scale(0.85); transform-origin: top center; }

  .zapn-sf-arena {
    gap: var(--space-lg);
  }

  .zapn-sw-arena {
    flex-direction: column;
    height: auto;
  }

  .zapn-sw-divider {
    width: auto;
    height: 1px;
  }

  .zapn-fi-sel-group {
    flex-direction: column;
    align-items: flex-start;
  }

  .zapn-fi-sel-group .label {
    min-width: 0;
  }

  .zapn-result-row {
    grid-template-columns: 1fr auto;
    row-gap: 0.2rem;
  }

  .zapn-result-tag {
    grid-column: 1 / -1;
    order: -1;
  }
}

/* ================================================
   Probability Tests
   ================================================ */

/* ---- Category block ---- */
.prob-cat-block {
  margin-bottom: var(--space-xl);
}

.prob-qr-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.12rem 0.45rem;
  border: 1px solid rgba(184, 156, 75, 0.3);
  border-radius: 2px;
  color: var(--accent);
  background: var(--accent-dim);
  margin-left: var(--space-sm);
  vertical-align: middle;
}

/* ---- Question list ---- */
.prob-q-list {
  list-style: none;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.prob-q-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.prob-q-item:last-child { border-bottom: none; }
.prob-q-item:nth-child(odd) { background: var(--surface); }
.prob-q-item:hover { background: var(--surface-hover); }

.prob-q-left {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  flex: 1;
  min-width: 0;
}

.prob-q-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  min-width: 1.8rem;
  padding-top: 0.18rem;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.prob-q-title {
  font-size: 0.9rem;
  color: var(--text-heading);
  font-weight: 500;
  margin-bottom: 0.18rem;
}

.prob-q-summary {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.prob-q-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.prob-q-source {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Question view header ---- */
.prob-q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

/* ---- Question card ---- */
.prob-q-card {
  max-width: 780px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.prob-q-category-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.prob-q-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-heading);
  margin-bottom: var(--space-lg);
  max-width: 100%;
}

/* ---- Choices ---- */
.prob-choices {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: var(--space-md);
}

.prob-choice-btn {
  text-align: left;
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  line-height: 1.45;
  justify-content: flex-start;
  height: auto;
  white-space: normal;
}

.prob-choice--correct {
  border-color: #38a169 !important;
  background: rgba(56, 161, 105, 0.12) !important;
  color: #38a169 !important;
}

.prob-choice--wrong {
  border-color: #e53e3e !important;
  background: rgba(229, 62, 62, 0.09) !important;
  color: #e53e3e !important;
}

/* ---- Explanation ---- */
.prob-explanation {
  font-size: 0.88rem;
  line-height: 1.7;
  padding: var(--space-sm) var(--space-md);
  border-radius: 3px;
  border-left: 3px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.prob-explanation--correct { border-left-color: #38a169; }
.prob-explanation--wrong   { border-left-color: #e53e3e; }

/* ---- Results: category bars ---- */
.prob-result-row {
  display: grid;
  grid-template-columns: 220px 1fr 60px;
  gap: var(--space-md);
  align-items: center;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}

.prob-result-row:last-child { border-bottom: none; }

.prob-result-cat {
  font-size: 0.85rem;
  color: var(--text-heading);
}

.prob-result-bar-wrap {
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.prob-result-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.prob-result-score {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-align: right;
}

/* ---- Results: wrong answer items ---- */
.prob-wrong-item {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: var(--space-sm);
  background: var(--surface);
}

.prob-wrong-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: 0.25rem;
}

.prob-wrong-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  flex-shrink: 0;
}

.prob-wrong-title {
  font-size: 0.9rem;
  color: var(--text-heading);
  font-weight: 500;
}

.prob-wrong-answer {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #38a169;
  margin-bottom: 0.4rem;
}

.prob-wrong-exp {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .prob-q-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .prob-q-right { width: 100%; justify-content: flex-end; }

  .prob-result-row {
    grid-template-columns: 1fr 50px;
  }

  .prob-result-bar-wrap { display: none; }

  .prob-q-card { padding: var(--space-md); }
}

/* ================================================
   Coding Problems
   ================================================ */

/* Separator between tags in problem-id line */
.coding-sep {
  color: var(--muted);
  margin: 0 0.1em;
}

/* Status variants for difficulty labels */
.status--warn {
  border-color: rgba(214, 158, 46, 0.32);
  color: #d69e2e;
  background: rgba(214, 158, 46, 0.08);
}

.status--danger {
  border-color: rgba(229, 62, 62, 0.32);
  color: #e53e3e;
  background: rgba(229, 62, 62, 0.08);
}

/* ---- Code blocks ---- */
.code-block {
  display: block;
  background: var(--bg);
  border: 1px solid rgba(184, 156, 75, 0.12);
  border-radius: 3px;
  padding: var(--space-sm) var(--space-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.79rem;
  line-height: 1.65;
  color: var(--text);
  white-space: pre;
  margin: var(--space-xs) 0 var(--space-sm);
}

/* ---- Lists inside problem-meta dd ---- */
.coding-list {
  margin: 0.4rem 0 0 var(--space-md);
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.7;
}

.coding-list li { margin-bottom: 0.2rem; }
.coding-list--ol { list-style: decimal; }

/* ---- Expandable sections ---- */
.coding-expand {
  border-top: 1px solid var(--border);
}

.coding-expand + .coding-expand {
  border-top-color: var(--border);
}

/* First expand after the dl */
.problem-meta + .coding-expand,
.coding-expand:first-of-type {
  margin-top: var(--space-md);
  border-top-color: var(--border-strong);
}

.coding-expand summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 0;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  transition: color 0.15s;
}

.coding-expand summary::-webkit-details-marker { display: none; }

.coding-expand summary::after {
  content: '+';
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted);
  flex-shrink: 0;
  margin-left: var(--space-sm);
}

.coding-expand[open] summary::after { content: '−'; }

.coding-expand summary:hover        { color: var(--text-secondary); }
.coding-expand[open] summary        { color: var(--accent); }

/* Warning variant — pitfall sections */
.coding-expand--warn[open] summary  { color: #d69e2e; }

.coding-expand-body {
  padding: 0 0 var(--space-md);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.coding-expand-body p       { max-width: 680px; }
.coding-expand-body p + p   { margin-top: var(--space-sm); }
.coding-expand-body strong  { color: var(--text-heading); }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .code-block { font-size: 0.7rem; padding: var(--space-sm); }
}