/* ─────────────────────────────────────────
   USACO Assessment · Styled to match AI MARATHON
   ───────────────────────────────────────── */

:root {
  --bg: #07070f;
  --bg-elev: #0d0d1a;
  --surface: rgba(20, 20, 36, 0.6);
  --surface-strong: rgba(28, 28, 48, 0.82);
  --surface-soft: rgba(255, 255, 255, 0.04);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text: #f4f4ff;
  --text-dim: rgba(244, 244, 255, 0.72);
  --text-mute: rgba(244, 244, 255, 0.46);
  --text-on-grad: #08080f;

  --accent: #22d3ee;
  --accent-2: #a855f7;
  --accent-3: #f472b6;
  --accent-warm: #fbbf24;
  --accent-good: #4ade80;
  --accent-warn: #fb923c;
  --accent-danger: #f87171;

  --grad-hero: linear-gradient(135deg, #22d3ee 0%, #a855f7 50%, #f472b6 100%);
  --grad-soft: linear-gradient(135deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.18) 50%, rgba(244, 114, 182, 0.18));

  --radius: 14px;
  --radius-lg: 22px;
  --radius-sm: 10px;

  --font-display: "Space Grotesk", "Inter", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Consolas, "Cascadia Mono", monospace;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: hidden;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

a { color: inherit; text-decoration: none; }

/* ─── Background atmosphere (toned down for assessment use) ─── */

.grid-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at top, rgba(0, 0, 0, 0.85) 0%, transparent 70%);
  z-index: -2;
}

.aurora {
  position: fixed;
  inset: -10vmax;
  pointer-events: none;
  filter: blur(90px);
  z-index: -1;
  opacity: 0.32;
}

.aurora-blob {
  position: absolute;
  width: 50vmax;
  height: 50vmax;
  border-radius: 50%;
  mix-blend-mode: screen;
  animation: drift 32s ease-in-out infinite;
}
.blob-a { background: #22d3ee; top: -20vmax; left: -15vmax; }
.blob-b { background: #a855f7; top: 10vmax; right: -20vmax; animation-delay: -10s; animation-duration: 38s; }
.blob-c { background: #f472b6; bottom: -25vmax; left: 30vmax; animation-delay: -18s; animation-duration: 42s; }

@keyframes drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  33% { transform: translate3d(8vmax, -6vmax, 0) scale(1.1); }
  66% { transform: translate3d(-6vmax, 4vmax, 0) scale(0.9); }
}

@media (prefers-reduced-motion: reduce) {
  .aurora-blob, .brand-mark-pulse { animation: none !important; }
}

/* ─── Typography ─── */

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

p { margin: 0; }

::selection { background: rgba(168, 85, 247, 0.4); color: var(--text); }

/* ─── App shell ─── */

.app-shell {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* ─── Sidebar ─── */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px;
  background: rgba(7, 7, 15, 0.7);
  backdrop-filter: saturate(140%) blur(18px);
  -webkit-backdrop-filter: saturate(140%) blur(18px);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(168, 85, 247, 0.4) transparent;
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(168, 85, 247, 0.4); border-radius: 999px; }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding: 4px;
  border-radius: 12px;
  transition: background 0.2s ease;
}

.brand:hover {
  background: var(--surface-soft);
}

.brand-mark {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--grad-hero);
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
  box-shadow: 0 6px 26px rgba(168, 85, 247, 0.35);
}
.brand-mark::before {
  content: "M";
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-on-grad);
  font-size: 1.05rem;
}
.brand-mark-pulse {
  position: absolute;
  inset: -3px;
  border-radius: 13px;
  border: 1px solid rgba(244, 114, 182, 0.55);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.9; }
  100% { transform: scale(1.4); opacity: 0; }
}

.brand h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
  margin: 0;
}

.brand p {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  line-height: 1.4;
}

/* Sidebar panels */

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sidebar .panel {
  background: rgba(13, 13, 26, 0.6);
}

.student-panel,
.progress-panel,
.question-map {
  padding: 18px;
  margin-bottom: 14px;
}

.panel h2 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 14px;
}

.panel h3 {
  font-size: 16px;
  margin: 0 0 14px;
  color: var(--text);
}

/* Sidebar form labels */

label {
  display: grid;
  gap: 7px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  color: var(--text);
  background: rgba(7, 7, 15, 0.55);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: normal;
  text-transform: none;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(7, 7, 15, 0.85);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-mute);
}

select option {
  background: var(--bg-elev);
  color: var(--text);
}

/* Timer */

.timer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.timer span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.timer strong {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: var(--grad-hero);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

/* Progress */

.progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  position: relative;
}

.progress-track::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06));
}

.progress-track div {
  width: 0;
  height: 100%;
  background: var(--grad-hero);
  box-shadow: 0 0 18px rgba(168, 85, 247, 0.6);
  transition: width 250ms ease;
  position: relative;
  z-index: 1;
}

.progress-panel p {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* Buttons (sidebar variants below in shared block) */

/* Question map */

.map-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.map-dot {
  min-width: 0;
  min-height: 36px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.2s ease, background 0.2s ease;
}

.map-dot:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}

.map-dot.done {
  color: var(--text-on-grad);
  background: var(--grad-hero);
  border-color: transparent;
  font-weight: 700;
}

.map-dot.active {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  color: var(--text);
  border-color: var(--accent);
}

/* ─── Buttons (shared) ─── */

.primary-btn,
.secondary-btn,
.primary-action,
.finish-btn,
.language-btn {
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
  cursor: pointer;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.18s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.primary-btn,
.primary-action {
  background: var(--grad-hero);
  color: var(--text-on-grad);
  box-shadow: 0 10px 26px -10px rgba(168, 85, 247, 0.55);
}

.primary-btn:hover:not(:disabled),
.primary-action:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 14px 34px -10px rgba(244, 114, 182, 0.6);
}

.primary-btn {
  width: 100%;
  margin-top: 14px;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-strong);
  color: var(--text);
}

.secondary-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-2);
}

.finish-btn {
  background: linear-gradient(135deg, #4ade80, #22d3ee);
  color: var(--text-on-grad);
  box-shadow: 0 10px 26px -10px rgba(74, 222, 128, 0.5);
}

.finish-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 14px 34px -10px rgba(34, 211, 238, 0.6);
}

.sidebar .secondary-btn {
  width: 100%;
  margin-top: 10px;
}

.language-btn {
  min-height: 38px;
  padding: 0 16px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.14), rgba(168, 85, 247, 0.14));
  border-color: rgba(168, 85, 247, 0.4);
  color: var(--text);
  font-size: 13px;
}

.language-btn:hover {
  border-color: var(--accent-3);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.24), rgba(244, 114, 182, 0.24));
  transform: translateY(-1px);
}

/* ─── Workspace ─── */

.workspace {
  min-width: 0;
  padding: 32px clamp(20px, 4vw, 44px) 60px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.back-link:hover {
  color: var(--text);
  border-color: var(--accent-2);
  background: rgba(168, 85, 247, 0.08);
  transform: translateX(-2px);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.6rem;
}

/* Pills */

.status-pill,
.type-pill {
  flex: 0 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 6px 14px;
  background: var(--surface);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
}

.type-pill {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.14), rgba(168, 85, 247, 0.14));
  border-color: rgba(168, 85, 247, 0.35);
  color: var(--text);
}

/* Intro / question / report containers */

.intro-panel,
.question-stage,
.report {
  max-width: 1080px;
}

.intro-panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 36px);
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.08), rgba(168, 85, 247, 0.1) 50%, rgba(244, 114, 182, 0.08));
  backdrop-filter: blur(14px);
  overflow: hidden;
}

.intro-panel::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -120px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.32), transparent 70%);
  pointer-events: none;
}

.intro-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.4), transparent 30%, rgba(244, 114, 182, 0.4) 80%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.intro-panel > div {
  position: relative;
  z-index: 1;
}

.intro-panel h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
}

.intro-panel h3 {
  margin: 8px 0 0;
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.intro-panel p {
  max-width: 720px;
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.7;
}

/* ─── Question stage ─── */

.stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.stage-head h2 {
  margin-top: 6px;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.2;
}

.question-card {
  display: grid;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 28px);
  background: var(--surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 30px 60px -30px rgba(34, 211, 238, 0.18);
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.badge {
  border-radius: 999px;
  padding: 5px 12px;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.25);
  color: var(--accent);
  font-weight: 500;
}

.points {
  color: var(--accent-warm);
  font-weight: 500;
}

.prompt {
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
}

/* Problem block */

.problem-block {
  display: grid;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(7, 7, 15, 0.45);
}

.problem-block dl {
  display: grid;
  gap: 10px;
  margin: 0;
}

.problem-block dl div {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 12px;
}

.problem-block dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
  padding-top: 2px;
}

.problem-block dd {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.6;
}

/* Samples (input/output blocks) */

.samples {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.samples > div {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(10, 10, 22, 0.7);
}

.samples span {
  display: block;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.samples pre {
  border-radius: 0;
  margin: 0;
  background: transparent;
  padding: 12px 14px;
}

/* Code blocks */

pre {
  overflow: auto;
  margin: 0;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: #e0e7ff;
  background: rgba(7, 7, 15, 0.85);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  scrollbar-width: thin;
  scrollbar-color: rgba(168, 85, 247, 0.4) transparent;
}

pre::-webkit-scrollbar { height: 6px; width: 6px; }
pre::-webkit-scrollbar-thumb { background: rgba(168, 85, 247, 0.4); border-radius: 999px; }

/* Options (multiple choice) */

.options {
  display: grid;
  gap: 10px;
}

.option {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: normal;
  text-transform: none;
  margin-top: 0;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
}

.option:hover {
  border-color: var(--accent-2);
  background: rgba(168, 85, 247, 0.06);
  transform: translateX(2px);
}

.option input {
  width: 18px;
  height: 18px;
  min-height: 18px;
  margin: 1px 0 0;
  padding: 0;
  background: transparent;
  border: 0;
  accent-color: var(--accent);
}

.option:has(input:checked) {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.12), rgba(168, 85, 247, 0.1));
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.4) inset;
}

/* Written / code answer wrappers */

.written-answer,
.code-answer {
  display: grid;
  gap: 12px;
}

.code-answer textarea,
.written-answer textarea {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  min-height: 200px;
  padding: 14px 16px;
  resize: vertical;
  background: rgba(7, 7, 15, 0.7);
  border-color: var(--line-strong);
}

.written-answer p,
.rubric p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.65;
}

.rubric {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: rgba(7, 7, 15, 0.4);
}

.rubric strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.rubric ul {
  margin: 0 0 10px;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.65;
}

/* Feedback */

.feedback {
  margin-top: 14px;
  border-radius: var(--radius);
  padding: 14px 18px;
  font-weight: 500;
  font-size: 14px;
  line-height: 1.55;
  border: 1px solid transparent;
}

.feedback.good {
  color: #bbf7d0;
  background: rgba(74, 222, 128, 0.08);
  border-color: rgba(74, 222, 128, 0.3);
}

.feedback.warn {
  color: #fed7aa;
  background: rgba(251, 146, 60, 0.08);
  border-color: rgba(251, 146, 60, 0.3);
}

/* Stage actions */

.stage-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 22px;
}

/* ─── Report ─── */

.report {
  margin-top: 24px;
  padding-top: 4px;
}

.report-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.report-header h2 {
  margin: 6px 0 0;
  font-size: clamp(24px, 3vw, 32px);
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.score-grid article {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
  background: var(--surface);
  backdrop-filter: blur(10px);
  overflow: hidden;
}

.score-grid article::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-soft);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.5;
}

.score-grid span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.score-grid strong {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: var(--grad-hero);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.report-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 18px;
}

.report .panel {
  padding: 22px;
  margin-bottom: 18px;
}

/* Skill bars */

.skill-bars {
  display: grid;
  gap: 14px;
}

.skill-row {
  display: grid;
  gap: 7px;
}

.skill-label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.skill-label span:last-child {
  font-family: var(--font-mono);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.bar {
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
}

.bar div {
  height: 100%;
  border-radius: inherit;
  background: var(--grad-hero);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.4);
  transition: width 0.4s ease;
}

/* Lists */

.diagnosis-list,
.study-plan {
  margin: 0;
  padding-left: 22px;
  color: var(--text-dim);
  line-height: 1.75;
  font-size: 14px;
}

.diagnosis-list li::marker,
.study-plan li::marker {
  color: var(--accent-3);
}

/* Code review */

.review-list {
  display: grid;
  gap: 12px;
}

.review-item {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: rgba(7, 7, 15, 0.4);
}

.review-item div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.review-item strong {
  color: var(--text);
  font-weight: 600;
}

.review-item span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-warm);
  text-align: right;
}

.review-item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.55;
}

/* ─── Responsive ─── */

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .report-columns,
  .samples {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .workspace {
    padding: 24px 18px 50px;
  }

  .sidebar {
    padding: 18px;
  }

  .topbar,
  .stage-head,
  .report-header,
  .review-item div {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar-actions {
    justify-content: flex-end;
  }

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

  .stage-actions {
    justify-content: stretch;
  }

  .stage-actions button {
    flex: 1 1 140px;
  }

  .map-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}

/* ─── Print ─── */

@media print {
  .grid-bg,
  .aurora,
  .sidebar,
  .intro-panel,
  .question-stage,
  .back-link,
  #printBtn {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #0f172a !important;
  }

  .app-shell {
    display: block;
  }

  .workspace {
    padding: 0;
  }

  .panel,
  .score-grid article,
  .review-item {
    border-color: #e2e8f0 !important;
    background: #ffffff !important;
    color: #0f172a !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
  }

  .panel h2,
  .panel h3,
  .skill-label,
  .review-item strong,
  .report-header h2 {
    color: #0f172a !important;
  }

  .score-grid strong,
  .timer strong {
    color: #0f172a !important;
    background: none !important;
    -webkit-background-clip: border-box !important;
            background-clip: border-box !important;
  }

  .diagnosis-list,
  .study-plan,
  .review-item p,
  .review-item span,
  .skill-label span:last-child {
    color: #334155 !important;
  }

  .eyebrow,
  .score-grid span {
    color: #475569 !important;
  }

  .bar {
    background: #e2e8f0 !important;
  }

  .bar div {
    background: #2563eb !important;
    box-shadow: none !important;
  }

  pre {
    background: #f1f5f9 !important;
    color: #0f172a !important;
    border-color: #cbd5e1 !important;
  }
}