/* =========================================================
   TechFuse — Design tokens
   Palette inspired by an oscilloscope / diagnostic scan-tool
   screen: deep instrument-panel charcoal, a teal signal trace,
   and an amber warning-lamp accent for diagnostics content.
   ========================================================= */
:root {
  --bg-deep: #12161c;
  --bg-panel: #1b212b;
  --bg-panel-raised: #232b37;
  --border-line: #2a323d;
  --border-line-soft: #232a34;

  --text-primary: #e8ecf1;
  --text-muted: #8792a2;
  --text-faint: #5c6472;

  --accent-signal: #4fd1c5;   /* teal signal trace */
  --accent-signal-dim: #2f6f6a;
  --accent-warn: #f2a93b;     /* amber warning lamp */
  --accent-warn-dim: #7a5a24;

  --success: #3dd68c;
  --danger: #e5636a;

  --radius-s: 4px;
  --radius-m: 8px;
  --radius-l: 14px;

  --font-display: 'JetBrains Mono', 'Roboto Mono', SFMono-Regular, Consolas, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --header-h: 68px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

button {
  font-family: inherit;
  cursor: pointer;
}

::selection { background: var(--accent-signal-dim); color: #fff; }

.eyebrow {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* =========================================================
   Ads banner
   ========================================================= */
.ads-banner {
  border: 1px dashed var(--border-line);
  background:
    repeating-linear-gradient(
      135deg,
      rgba(79, 209, 197, 0.04) 0px,
      rgba(79, 209, 197, 0.04) 10px,
      transparent 10px,
      transparent 20px
    ),
    var(--bg-panel);
  color: var(--text-faint);
  font-family: var(--font-display);
  letter-spacing: 0.3em;
  text-align: center;
  margin: 14px auto 0;
  border-radius: var(--radius-s);
  font-size: 0.72rem;
  width: 728px;
  max-width: calc(100% - 32px);
  aspect-ratio: 728 / 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.ads-banner-size {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  opacity: 0.7;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 32px 10px;
  max-width: 1280px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark svg { display: block; }

.brand-text h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}

.brand-link {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.brand-link:hover,
.brand-link:focus-visible {
  color: var(--accent-signal);
}

.brand-text .eyebrow { margin-top: 2px; }

.site-nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-nav a:hover {
  color: var(--accent-signal);
  border-color: var(--accent-signal);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 8px;
  border: 1px solid var(--border-line);
  border-radius: 999px;
  background: var(--bg-panel);
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.user-badge:hover,
.user-badge:focus-visible {
  border-color: var(--accent-signal);
  background: var(--bg-panel-raised);
}

.user-badge-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-panel-raised);
  flex: 0 0 24px;
}

.user-badge-name {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--text-primary);
  white-space: nowrap;
}

@media (max-width: 560px) {
  .header-right { width: 100%; justify-content: space-between; }
}

.waveform-divider {
  display: block;
  width: 100%;
  height: 22px;
  margin: 6px 0 18px;
}
.waveform-divider path {
  fill: none;
  stroke: var(--accent-signal);
  stroke-width: 1.6;
  opacity: 0.55;
}

/* =========================================================
   Layout
   ========================================================= */
.app-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px 60px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 28px;
  align-items: start;
}

@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr 260px;
    gap: 20px;
    padding: 0 24px 50px;
  }
}

@media (max-width: 880px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .app-shell {
    padding: 0 16px 40px;
    gap: 16px;
  }
}

.main-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

/* =========================================================
   Sidebar / Menu
   ========================================================= */
.sidebar {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-l);
  padding: 18px;
  position: sticky;
  top: 18px;
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) transparent;
}

.sidebar::-webkit-scrollbar {
  width: 8px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-line);
  border-radius: 999px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--text-faint);
}

.sidebar h2 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 14px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar h2::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent-signal);
  box-shadow: 0 0 8px var(--accent-signal);
}

.menu-category { margin-bottom: 10px; }

.menu-category-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-panel-raised);
  border: 1px solid var(--border-line);
  color: var(--text-primary);
  padding: 10px 12px;
  border-radius: var(--radius-m);
  font-size: 0.88rem;
  font-weight: 600;
  text-align: left;
}

.menu-category-btn .chevron {
  transition: transform 0.18s ease;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.menu-category[data-open="true"] .chevron {
  transform: rotate(90deg);
  color: var(--accent-signal);
}

.menu-subcategories {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease;
}

.menu-category[data-open="true"] .menu-subcategories {
  max-height: 6000px;
}

.menu-subcategory {
  margin: 8px 0 0 10px;
  padding-left: 10px;
  border-left: 1px dashed var(--border-line);
}

.menu-subcategory-label {
  font-family: var(--font-display);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warn);
  margin: 6px 0 6px;
}

.quiz-link-btn {
  display: block;
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  text-align: left;
  padding: 7px 8px;
  border-radius: var(--radius-s);
  font-size: 0.85rem;
  margin-bottom: 2px;
}

.quiz-link-btn:hover {
  color: var(--text-primary);
  background: rgba(79, 209, 197, 0.08);
  border-color: var(--border-line);
}

.quiz-link-btn.active {
  color: var(--bg-deep);
  background: var(--accent-signal);
  font-weight: 600;
}

/* 720x300 ad placeholder, sits under the quiz panel in the left column.
   Placed here (rather than in the sidebar) so a long category list never
   pushes it further down the page. */
.ads-under-quiz {
  width: 720px;
  max-width: 100%;
  aspect-ratio: 720 / 300;
  margin: 0 auto;
  border: 1px dashed var(--border-line);
  background:
    repeating-linear-gradient(
      135deg,
      rgba(79, 209, 197, 0.04) 0px,
      rgba(79, 209, 197, 0.04) 10px,
      transparent 10px,
      transparent 20px
    ),
    var(--bg-panel-raised);
  border-radius: var(--radius-m);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-faint);
  font-family: var(--font-display);
  letter-spacing: 0.3em;
  font-size: 0.72rem;
}

.ads-under-quiz-size {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  opacity: 0.7;
}

/* =========================================================
   Mobile menu toggle (hamburger)
   ========================================================= */
.mobile-menu-bar {
  display: none;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

.menu-toggle-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--radius-m);
  font-size: 0.85rem;
  font-weight: 600;
}

.menu-toggle-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.menu-toggle-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--accent-signal);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle-btn[aria-expanded="true"] .menu-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.menu-toggle-btn[aria-expanded="true"] .menu-toggle-icon span:nth-child(2) {
  opacity: 0;
}
.menu-toggle-btn[aria-expanded="true"] .menu-toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 880px) {
  .mobile-menu-bar {
    display: block;
    margin-bottom: 16px;
  }

  .sidebar {
    order: -1;
    position: static;
    top: auto;
    max-height: 0;
    opacity: 0;
    padding: 0 18px;
    margin: 0;
    overflow: hidden;
    border-width: 0;
    transition: max-height 0.3s ease, opacity 0.25s ease, padding 0.3s ease;
  }

  .sidebar.open {
    max-height: calc(100vh - 140px);
    opacity: 1;
    padding: 18px;
    border-width: 1px;
    margin-bottom: 4px;
    overflow-y: auto;
  }
}

/* =========================================================
   Main content
   ========================================================= */
.main-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-l);
  padding: 32px;
  min-height: 420px;
}

.welcome-card {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 0 4px;
}

.welcome-card .signal-icon {
  margin: 0 auto 18px;
  display: block;
}

.welcome-card h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 10px;
}

.welcome-card p {
  color: var(--text-muted);
  max-width: 52ch;
  margin: 0 auto;
}

.stat-row {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.stat-block {
  min-width: 90px;
}

.stat-block .stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent-signal);
}

.stat-block .stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cta-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 32px auto 4px;
  padding: 14px 22px;
  max-width: fit-content;
  border: 1px solid var(--accent-warn-dim);
  background: rgba(242, 169, 59, 0.08);
  border-radius: 999px;
  flex-wrap: wrap;
}

.cta-arrow {
  display: flex;
  flex: 0 0 auto;
  animation: cta-nudge-right 1.6s ease-in-out infinite;
}

.cta-arrow-up { display: none; }

.cta-text {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

.cta-text-mobile { display: none; }

@keyframes cta-nudge-right {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(5px); }
}

@keyframes cta-nudge-up {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@media (max-width: 880px) {
  .cta-arrow-right { display: none; }
  .cta-arrow-up {
    display: flex;
    animation-name: cta-nudge-up;
  }
  .cta-text-desktop { display: none; }
  .cta-text-mobile { display: inline; }
}

/* Quiz header — sticky so category/title + progress stay visible while scrolling questions */
.quiz-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 14px;
  margin: 0 0 18px;
  padding: 14px 0 18px;
  border-bottom: 1px solid var(--border-line);
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg-panel);
}

.quiz-head h2 {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
}

/* Progress trace: square-wave pulses that fill as you answer */
.progress-trace {
  display: flex;
  gap: 4px;
  align-items: flex-end;
  height: 26px;
}

.progress-trace .pulse {
  width: 14px;
  height: 10px;
  background: var(--bg-panel-raised);
  border: 1px solid var(--border-line);
  border-radius: 2px;
  transition: background 0.2s ease, height 0.2s ease;
}

.progress-trace .pulse.correct {
  background: #7dd3fc;
  border-color: #7dd3fc;
  height: 22px;
}

.progress-trace .pulse.incorrect {
  background: #f87171;
  border-color: #f87171;
  height: 22px;
}

/* Questions */
.question-card {
  border: 1px solid var(--border-line);
  border-radius: var(--radius-m);
  padding: 20px;
  margin-bottom: 16px;
  background: var(--bg-panel-raised);
}

.question-card .q-num {
  font-family: var(--font-display);
  color: var(--accent-warn);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
  display: block;
}

.question-card p.q-text {
  margin: 0 0 14px;
  font-size: 1rem;
}

.code-block {
  margin: 10px 0 0;
  padding: 14px 16px;
  background: var(--bg-deep);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-s);
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-display);
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--accent-signal);
  white-space: pre;
}

@media (max-width: 560px) {
  .code-block { padding: 12px; }
  .code-block code { font-size: 0.78rem; }
}

.question-diagram {
  margin: 4px 0 16px;
  padding: 10px;
  background: var(--bg-deep);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-m);
  text-align: center;
}

.question-diagram img {
  max-width: 100%;
  height: auto;
  display: inline-block;
  border-radius: var(--radius-s);
}

@media (max-width: 560px) {
  .question-diagram { padding: 6px; }
}

.answer-options {
  display: grid;
  gap: 8px;
}

.answer-option {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border-line);
  background: var(--bg-panel);
  color: var(--text-primary);
  padding: 10px 12px;
  border-radius: var(--radius-s);
  font-size: 0.92rem;
  text-align: left;
}

.answer-option:hover {
  border-color: var(--accent-signal-dim);
}

.answer-option .opt-marker {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  border-radius: 50%;
  border: 1px solid var(--text-faint);
}

.answer-option.selected .opt-marker {
  border-color: var(--accent-signal);
  background: var(--accent-signal);
}

.answer-option.selected {
  border-color: var(--accent-signal);
}

.answer-option.correct {
  border-color: var(--success);
  background: rgba(61, 214, 140, 0.08);
}

.answer-option.correct .opt-marker {
  background: var(--success);
  border-color: var(--success);
}

.answer-option.incorrect {
  border-color: var(--danger);
  background: rgba(229, 99, 106, 0.08);
}

.answer-option.incorrect .opt-marker {
  background: var(--danger);
  border-color: var(--danger);
}

.answer-option:disabled {
  cursor: default;
}

.explanation {
  margin-top: 12px;
  padding: 10px 12px;
  border-left: 2px solid var(--accent-signal);
  background: rgba(79, 209, 197, 0.06);
  font-size: 0.85rem;
  color: var(--text-muted);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  display: none;
}

.explanation.visible { display: block; }

.explanation-why {
  margin: 0;
}

sub, sup {
  font-size: 0.72em;
}


/* Quiz actions */
.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border-radius: var(--radius-m);
  padding: 12px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-signal);
  color: #0b1310;
}
.btn-primary:hover { background: #63dccf; }

.btn-ghost {
  background: transparent;
  border-color: var(--border-line);
  color: var(--text-muted);
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--text-muted); }

.hint-text {
  font-size: 0.78rem;
  color: var(--text-faint);
}

/* Results */
.results-card {
  text-align: center;
  padding: 20px 10px 6px;
}

.results-card .eyebrow { justify-content: center; display: block; margin-bottom: 8px; }

.score-display {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--accent-signal);
  margin: 6px 0 2px;
}

.score-sub {
  color: var(--text-muted);
  margin-bottom: 22px;
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.share-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border-line);
  background: var(--bg-panel-raised);
  color: var(--text-primary);
  padding: 9px 16px;
  border-radius: var(--radius-m);
  font-size: 0.82rem;
}

.share-btn:hover { border-color: var(--accent-signal); color: var(--accent-signal); }
.share-btn svg { width: 16px; height: 16px; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--border-line);
  margin-top: 20px;
  padding: 22px 32px 40px;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-muted);
}

.footer-links a:hover { color: var(--accent-signal); }

/* Focus visibility for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-signal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; animation: none !important; }
}

@media (max-width: 768px) {
  .ads-banner { margin: 12px auto 0; letter-spacing: 0.2em; }
  .site-header { padding: 18px 20px 8px; }
  .site-nav { gap: 14px 18px; }
  .quiz-head { flex-direction: column; align-items: flex-start; }
  .stat-row { gap: 18px; }
}

@media (max-width: 560px) {
  .site-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .site-nav { width: 100%; }
  .main-panel { padding: 20px; }
  .brand-text h1 { font-size: 1.15rem; }
  .welcome-card h2 { font-size: 1.2rem; }
  .score-display { font-size: 2.3rem; }
  .progress-trace { flex-wrap: wrap; row-gap: 4px; }
  .quiz-actions { flex-direction: column; align-items: stretch; }
  .quiz-actions .btn { width: 100%; }
  .results-actions .btn { flex: 1 1 140px; }
  .site-footer { flex-direction: column; align-items: flex-start; padding: 18px 20px 32px; }
}

@media (max-width: 400px) {
  .answer-option { font-size: 0.85rem; padding: 9px 10px; }
  .question-card { padding: 16px; }
  .share-btn { flex: 1 1 45%; justify-content: center; }
}

/* =========================================================
   Static content pages (about / contact / updates / terms)
   ========================================================= */
.page-shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.page-shell h1 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin-bottom: 4px;
}

.page-shell h2 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 28px 0 8px;
  color: var(--accent-signal);
}

.page-shell p, .page-shell li {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.page-shell a.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--accent-signal);
  text-decoration: none;
}

.page-shell a.back-link:hover { text-decoration: underline; }

.page-title-block {
  text-align: center;
  margin: 12px 0 32px;
}

.page-title-block h1 {
  margin-bottom: 0;
}

.update-entry {
  border-left: 2px solid var(--accent-signal);
  padding: 4px 0 4px 14px;
  margin-bottom: 20px;
}

.update-entry .update-date {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--accent-warn);
  letter-spacing: 0.06em;
}

.contact-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  margin: 18px 0;
}

.contact-card a { color: var(--accent-signal); text-decoration: none; }

.reference-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}

.reference-list li {
  padding: 12px 16px;
  margin-bottom: 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-left: 2px solid var(--accent-signal);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: 0.9rem;
}

.reference-list li em {
  color: var(--text-primary);
  font-style: italic;
}

/* =========================================================
   Profile page
   ========================================================= */
.profile-shell {
  max-width: 880px;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
}

.profile-avatar {
  flex: 0 0 64px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-panel-raised);
  border: 2px solid var(--accent-signal);
  color: var(--accent-signal);
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-identity { flex: 1; min-width: 0; }

.profile-name-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.profile-name-row h1 {
  margin: 0;
  font-size: 1.5rem;
}

.btn-small {
  padding: 6px 14px;
  font-size: 0.78rem;
}

.profile-name-edit {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.profile-name-edit[hidden] {
  display: none;
}

.profile-name-edit input {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-s);
  color: var(--text-primary);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 0.9rem;
  min-width: 200px;
}

.profile-userid {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--text-faint);
}

.profile-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.profile-stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-m);
  padding: 18px;
  text-align: center;
}

.profile-stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent-signal);
}

.profile-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.profile-medals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-items: stretch;
  margin-bottom: 28px;
}

.medal-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-m);
  padding: 16px;
  text-align: center;
}

.medal-icon { font-size: 1.6rem; }

.medal-count {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-primary);
}

.medal-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

#share-score-btn {
  grid-column: 1 / -1;
}

.profile-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-l);
  padding: 22px;
  margin-bottom: 20px;
}

.profile-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.profile-card-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-signal);
}

.range-toggle {
  display: flex;
  gap: 6px;
}

.range-btn {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-s);
  font-size: 0.8rem;
}

.range-btn.active {
  background: var(--accent-signal);
  color: var(--bg-deep);
  border-color: var(--accent-signal);
  font-weight: 600;
}

.insight-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  margin: 0 0 20px;
  padding: 14px 20px;
  border: 1px solid var(--accent-warn-dim);
  background: rgba(242, 169, 59, 0.08);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.insight-icon {
  flex: 0 0 auto;
  font-size: 1.1rem;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.dashboard-panel {
  min-width: 0;
}

.panel-description {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.plotly-chart {
  width: 100%;
  min-height: 260px;
}

.plotly-chart-tall {
  min-height: 300px;
}

.chart-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  text-align: center;
  padding: 0 20px;
}

@media (max-width: 720px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

/* Cap the per-quiz table to a header + 10 rows; anything beyond that
   scrolls, with an always-visible (not hover-only) scrollbar so the
   presence of more rows is obvious at a glance. */
.table-scroll {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 452px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-s);
  scrollbar-width: thin;
  scrollbar-color: var(--accent-signal-dim) var(--bg-panel-raised);
}

.table-scroll::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.table-scroll::-webkit-scrollbar-track {
  background: var(--bg-panel-raised);
}

.table-scroll::-webkit-scrollbar-thumb {
  background-color: var(--accent-signal-dim);
  border-radius: 6px;
  border: 2px solid var(--bg-panel-raised);
}

.table-scroll::-webkit-scrollbar-thumb:hover {
  background-color: var(--accent-signal);
}

.profile-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.profile-table thead th {
  position: sticky;
  top: 0;
  background: var(--bg-panel);
  z-index: 1;
}

.profile-table th, .profile-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-line);
  white-space: nowrap;
}

.profile-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.profile-table td { color: var(--text-primary); }

.data-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 14px 0 6px;
}

.file-label {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

.danger-zone {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-line);
  text-align: center;
}

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover {
  background: rgba(229, 99, 106, 0.1);
  color: var(--danger);
  border-color: var(--danger);
}

@media (max-width: 640px) {
  .profile-stats-grid, .profile-medals {
    grid-template-columns: 1fr 1fr;
  }
  #share-score-btn { grid-column: 1 / -1; }
  .profile-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .profile-stats-grid, .profile-medals {
    grid-template-columns: 1fr;
  }
}