:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-bg: #eef2ff;
  --secondary: #f59e0b;
  --secondary-bg: #fffbeb;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --error: #ef4444;
  --error-bg: #fef2f2;
  --bg: #f0f9ff;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --surface-subtle: #f8fafc;
  --surface-neutral: #f3f4f6;
  --radius: 16px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme='dark'] {
  --primary: #818cf8;
  --primary-light: #a5b4fc;
  --primary-bg: #1e1b4b;
  --secondary: #fcd34d;
  --secondary-bg: rgba(252, 211, 77, 0.12);
  --success: #34d399;
  --success-bg: #064e3b;
  --error: #f87171;
  --error-bg: #450a0a;
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: #334155;
  --surface-subtle: #111c33;
  --surface-neutral: #18233a;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background:
    radial-gradient(circle at top, rgba(129, 140, 248, 0.12), transparent 34%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 17px;
  line-height: 1.5;
}

/* ── Header ─────────────────────────────────────── */
#app-header {
  background: var(--primary);
  color: #fff;
  padding: 12px 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.header-logo {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.35rem;
  font-weight: 800;
  flex: 1;
  white-space: nowrap;
  text-align: left;
  cursor: pointer;
  padding: 0;
}
.header-logo:hover {
  opacity: 0.92;
}
.nav-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.2s;
}
.nav-btn:hover {
  background: rgba(255, 255, 255, 0.35);
}
.nav-btn.active {
  background: rgba(255, 255, 255, 0.45);
}
.theme-btn {
  background: rgba(255, 255, 255, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
  flex-shrink: 0;
}
.theme-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}
.restart-btn {
  background: var(--secondary);
  border: none;
  color: #fff;
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 700;
  white-space: nowrap;
  transition:
    transform 0.15s,
    background 0.2s;
}
.restart-btn:hover {
  background: #d97706;
  transform: scale(1.05);
}

/* ── Main ────────────────────────────────────────── */
#main-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 16px 48px;
}

/* ── Cards & Buttons ─────────────────────────────── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: none;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition:
    transform 0.15s,
    box-shadow 0.15s;
  text-decoration: none;
}
.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}
.btn:active:not(:disabled) {
  transform: translateY(0);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-amber {
  background: var(--secondary);
  color: #fff;
}
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}
.btn-danger {
  background: var(--error);
  color: #fff;
}
.btn-download {
  background: #0f766e;
  color: #fff;
}
.btn-lg {
  font-size: 1.2rem;
  padding: 16px 32px;
  border-radius: 14px;
}
.w-full {
  width: 100%;
}
.text-center {
  text-align: center;
}

/* ── HOME ────────────────────────────────────────── */
.home-hero {
  text-align: center;
  padding: 8px 0 24px;
}
.home-hero h2 {
  font-size: 1.9rem;
  color: var(--primary);
  margin-bottom: 8px;
}
.home-hero p {
  color: var(--muted);
  margin-bottom: 28px;
}
.content-set-picker {
  max-width: 680px;
  margin: 0 auto 30px;
  padding: 18px;
  border: 2px solid var(--border);
  border-radius: 18px;
  background: var(--surface-subtle);
  text-align: left;
}
.home-hero .content-set-title {
  margin-bottom: 14px;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 800;
  text-align: center;
}
.content-set-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.content-set-option {
  min-height: 82px;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition:
    border-color 0.15s,
    box-shadow 0.15s,
    transform 0.15s;
}
.content-set-option:hover {
  border-color: var(--primary-light);
  transform: translateY(-2px);
}
.content-set-option:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 3px;
}
.content-set-option.selected {
  border-color: var(--primary);
  background: var(--primary-bg);
  box-shadow: 0 5px 14px rgba(79, 70, 229, 0.16);
}
.content-set-option-name,
.content-set-option-state {
  display: block;
}
.content-set-option-name {
  font-size: 1rem;
  font-weight: 900;
}
.content-set-option-state {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}
.content-set-option.selected .content-set-option-name,
.content-set-option.selected .content-set-option-state {
  color: var(--primary);
}

.topic-section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.topic-card {
  width: 100%;
  background: var(--card);
  border: 2.5px solid var(--border);
  border-radius: 12px;
  padding: 16px 14px;
  cursor: pointer;
  text-align: center;
  font: inherit;
  color: inherit;
  transition:
    border-color 0.2s,
    transform 0.2s,
    box-shadow 0.2s;
}
.topic-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.13);
}
.topic-card.selected {
  border-color: var(--primary);
  background: var(--primary-bg);
}
.topic-card.selected .topic-name {
  color: var(--primary);
}
.topic-icon {
  font-size: 2rem;
  margin-bottom: 6px;
}
.topic-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}
.topic-count {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 3px;
}

.question-count-panel {
  background: linear-gradient(145deg, var(--primary-bg), var(--card));
  border: 2px solid var(--primary-light);
  border-radius: 18px;
  padding: 22px;
  scroll-margin-top: 92px;
}
.question-count-heading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: left;
}
.question-count-icon {
  font-size: 2.25rem;
}
.question-count-eyebrow {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.question-count-heading h3 {
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1.2;
}
.question-count-help {
  color: var(--muted);
  font-weight: 650;
  margin: 12px 0 16px;
  text-align: center;
}
.question-count-picker {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
}
.count-step {
  width: 54px;
  min-height: 54px;
  border: 2px solid var(--primary);
  border-radius: 14px;
  background: var(--card);
  color: var(--primary);
  cursor: pointer;
  font-size: 1.8rem;
  font-weight: 900;
}
.count-step:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
.question-count-input {
  width: 110px;
  min-height: 54px;
  border: 3px solid var(--primary);
  border-radius: 14px;
  background: var(--card);
  color: var(--text);
  font: inherit;
  font-size: 1.55rem;
  font-weight: 900;
  text-align: center;
}
.question-count-input[aria-invalid='true'] {
  border-color: var(--error);
  background: var(--error-bg);
}
.question-count-shortcuts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
}
.count-shortcut {
  min-height: 44px;
  border: 2px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 800;
  padding: 8px 16px;
}
.count-shortcut[aria-pressed='true'] {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}
.question-count-error {
  min-height: 24px;
  color: var(--error);
  font-size: 0.88rem;
  font-weight: 750;
  margin: 10px 0 4px;
  text-align: center;
}
.question-count-start {
  display: flex;
  margin: 0 auto;
}

/* ── SUBJECT CARDS ───────────────────────────────── */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 8px;
}
.subject-card {
  background: var(--card);
  border: 2.5px solid var(--border);
  border-radius: 16px;
  padding: 24px 14px 20px;
  cursor: pointer;
  text-align: center;
  transition:
    border-color 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
}
.subject-card:not(.disabled):hover {
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.14);
}
.subject-card.disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.subject-icon {
  font-size: 2.6rem;
  margin-bottom: 8px;
}
.subject-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.subject-count {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}
.subject-soon {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--surface-subtle);
  color: var(--muted);
  padding: 2px 10px;
  border-radius: 20px;
}

/* ── SUBJECT DETAIL ──────────────────────────────── */
.subject-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.subject-header h2 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--primary);
}
.btn-back {
  background: none;
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  transition:
    border-color 0.15s,
    color 0.15s;
  flex-shrink: 0;
}
.btn-back:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ── QUIZ ────────────────────────────────────────── */
.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}
.quiz-meta .counter {
  font-weight: 700;
  color: var(--muted);
  font-size: 0.9rem;
}
.quiz-meta .score-live {
  font-weight: 700;
  color: var(--success);
  font-size: 0.9rem;
}
.quiz-meta .topic-tag {
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--primary-bg);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 99px;
}

.quiz-intro {
  text-align: center;
  padding: 10px 0 6px;
}
.quiz-intro-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 14px;
}
.quiz-intro h2 {
  font-size: 1.7rem;
  color: var(--primary);
  margin-bottom: 8px;
}
.quiz-intro-copy {
  max-width: 620px;
  margin: 0 auto 22px;
  color: var(--muted);
}
.quiz-intro-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.quiz-intro-item {
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 16px;
}
.quiz-intro-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.quiz-intro-value {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text);
}
.quiz-intro-notes {
  display: grid;
  gap: 10px;
  text-align: left;
  margin-bottom: 22px;
}
.quiz-intro-note {
  background: var(--secondary-bg);
  border-left: 4px solid var(--secondary);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 0.95rem;
}

.question-timer-wrap {
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 14px;
}
.question-timer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.timer-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.question-timer {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--primary);
}
.timer-bar {
  width: 100%;
  height: 10px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.timer-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #10b981, #34d399);
  border-radius: 999px;
  transition:
    width 0.25s linear,
    background 0.2s ease;
}
.timer-fill.warning {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}
.timer-fill.danger {
  background: linear-gradient(90deg, #ef4444, #f87171);
}

.timer-config-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}
.timer-step {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 32px;
  height: 32px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.timer-step:hover {
  background: var(--primary-light);
}
.timer-config-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  min-width: 36px;
  text-align: center;
}
.timer-config-unit {
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 22px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 99px;
  transition: width 0.4s ease;
}

.text-excerpt {
  background: var(--surface-subtle);
  border-left: 4px solid var(--secondary);
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 16px;
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text);
}
.text-excerpt-label {
  font-style: normal;
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.question-text {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.55;
  margin-bottom: 22px;
}

.question-support {
  margin: -6px 0 22px;
  padding: 12px 14px;
  border-left: 4px solid var(--primary);
  border-radius: 0 10px 10px 0;
  background: var(--primary-bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.55;
}

.question-support span,
.gab-question-support span {
  color: var(--primary);
  font-weight: 800;
}

.gab-question-support {
  margin: -4px 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}
.question-text {
  color: var(--text);
}

.options {
  display: grid;
  gap: 11px;
}
.option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--card);
  border: 2.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  font-size: 0.98rem;
  font-weight: 500;
  transition:
    border-color 0.2s,
    background 0.2s,
    transform 0.15s;
  width: 100%;
  color: var(--text);
}
.option-btn:hover:not(:disabled) {
  border-color: var(--primary-light);
  background: var(--primary-bg);
  transform: translateX(4px);
}
.option-letter {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition:
    background 0.2s,
    color 0.2s;
}
.option-btn.correct {
  border-color: var(--success);
  background: var(--success-bg);
}
.option-btn.correct {
  color: var(--text);
}
.option-btn.correct .option-letter {
  background: var(--success);
  color: #fff;
}
.option-btn.wrong {
  border-color: var(--error);
  background: var(--error-bg);
}
.option-btn.wrong {
  color: var(--text);
}
.option-btn.wrong .option-letter {
  background: var(--error);
  color: #fff;
}
.option-btn.reveal {
  border-color: var(--success);
  background: var(--success-bg);
  opacity: 0.7;
}
.option-btn.reveal {
  color: var(--text);
}
.option-btn.reveal .option-letter {
  background: var(--success);
  color: #fff;
}
.option-btn:disabled {
  cursor: not-allowed;
}

.feedback {
  margin-top: 18px;
  padding: 16px;
  border-radius: 12px;
  animation: fadeDown 0.3s ease;
  color: var(--text);
}
.feedback.ok {
  background: var(--success-bg);
  border: 2px solid var(--success);
}
.feedback.fail {
  background: var(--error-bg);
  border: 2px solid var(--error);
}
.feedback-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.feedback.ok .feedback-title {
  color: var(--success);
}
.feedback.fail .feedback-title {
  color: var(--error);
}
.feedback-block {
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 10px;
}
.feedback-label {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}
.feedback-explain {
  font-size: 0.93rem;
  line-height: 1.55;
  color: var(--text);
}
.feedback-why {
  font-size: 0.87rem;
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 6px;
}

.quiz-next {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}

@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── RESULTS ─────────────────────────────────────── */
.results-top {
  text-align: center;
  padding: 12px 0 28px;
}
.score-circle {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: #fff;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.14);
}
.score-pct {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1;
}
.score-frac {
  font-size: 0.9rem;
  opacity: 0.9;
}
.grade-a {
  background: linear-gradient(135deg, #10b981, #059669);
}
.grade-b {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
}
.grade-c {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}
.grade-d {
  background: linear-gradient(135deg, #f97316, #ea580c);
}
.grade-f {
  background: linear-gradient(135deg, #ef4444, #b91c1c);
}

.score-msg {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.stars-row {
  font-size: 2rem;
  letter-spacing: 4px;
  margin-bottom: 24px;
}
.results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.gabarito-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
}
.gabarito-item {
  background: var(--card);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  border-left: 4px solid var(--border);
  color: var(--text);
}
.gabarito-item.ok-item {
  border-left-color: var(--success);
}
.gabarito-item.fail-item {
  border-left-color: var(--error);
}
.gab-num {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 3px;
}
.gab-q {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
  color: var(--text);
}
.gab-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.88rem;
}
.tag {
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 700;
}
.tag-user-ok {
  background: var(--success-bg);
  color: #059669;
}
.tag-user-fail {
  background: var(--error-bg);
  color: #dc2626;
}
.tag-correct {
  background: var(--success-bg);
  color: #059669;
}
.gab-block {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.gab-label {
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}
.gab-answer {
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}
.gab-explain {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text);
}
.gab-why-wrong {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 6px;
}

/* ── HISTORY ─────────────────────────────────────── */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}
.history-header h2 {
  font-size: 1.4rem;
  font-weight: 800;
}
.history-filters {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}
.history-period-filter {
  display: grid;
  grid-template-columns: minmax(190px, auto) minmax(220px, 1fr);
  align-items: center;
  gap: 12px;
  padding: 14px;
  margin-bottom: 14px;
  border: 2px solid var(--primary-light);
  border-radius: 14px;
  background: var(--primary-bg);
}
.history-period-filter label {
  color: var(--text);
  font-weight: 800;
}
.history-search,
.history-select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 0.92rem;
}
.history-search:focus,
.history-select:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.14);
}
.history-summary {
  margin: 2px 0 16px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}
.session-period {
  display: inline-block;
  margin-bottom: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 800;
}
.chart-wrap {
  position: relative;
  height: 240px;
  margin-bottom: 24px;
}
.session-list {
  display: grid;
  gap: 11px;
}
.session-card {
  background: var(--card);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.session-badge {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.88rem;
  color: #fff;
  flex-shrink: 0;
}
.session-info {
  flex: 1;
}
.session-date {
  font-size: 0.82rem;
  color: var(--muted);
}
.session-topic {
  font-weight: 700;
  font-size: 0.93rem;
}
.session-meta {
  margin-top: 4px;
  font-size: 0.84rem;
  color: var(--muted);
}
.session-side {
  text-align: right;
  min-width: 110px;
}
.session-stars {
  font-size: 1.1rem;
}
.session-level {
  margin-top: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}
.history-empty-filter {
  background: var(--surface-subtle);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}
.empty-icon {
  font-size: 4rem;
  margin-bottom: 14px;
}
.empty-msg {
  font-size: 1rem;
}

/* ── Stat cards ──────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.stat-val {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary);
}
.stat-lbl {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.history-header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.btn-sm {
  padding: 5px 10px;
  font-size: 0.82rem;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 580px) {
  body {
    font-size: 16px;
  }
  .header-inner {
    gap: 8px;
    flex-wrap: wrap;
  }
  .header-logo {
    font-size: 1.1rem;
  }
  .nav-btn,
  .restart-btn {
    font-size: 0.78rem;
    padding: 6px 10px;
  }
  .home-hero h2 {
    font-size: 1.5rem;
  }
  .content-set-picker {
    padding: 14px;
  }
  .content-set-options,
  .history-period-filter {
    grid-template-columns: 1fr;
  }
  .content-set-option {
    min-height: 72px;
    text-align: center;
  }
  .question-text {
    font-size: 1.05rem;
  }
  .score-circle {
    width: 120px;
    height: 120px;
  }
  .score-pct {
    font-size: 2rem;
  }
  .topic-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
  .subject-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .results-actions {
    gap: 8px;
  }
  .results-actions .btn {
    font-size: 0.9rem;
    padding: 10px 14px;
  }
  .history-filters {
    grid-template-columns: 1fr;
  }
  .session-card {
    align-items: flex-start;
  }
  .session-side {
    min-width: 0;
    text-align: left;
  }
  .quiz-intro-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 581px) and (max-width: 768px) {
  .subject-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .topic-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ── Toast ─────────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: #1e293b;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
  max-width: 320px;
}
.toast.toast-visible {
  opacity: 1;
  transform: translateY(0);
}
.toast.toast-warning {
  background: #d97706;
}
.toast.toast-error {
  background: #dc2626;
}
.toast.toast-success {
  background: #059669;
}

/* ── Acessibilidade ────────────────────────────────────────────── */
.btn:focus-visible,
.option-btn:focus-visible,
.topic-card:focus-visible,
.count-step:focus-visible,
.count-shortcut:focus-visible,
.question-count-input:focus-visible,
.subject-card:focus-visible,
.nav-btn:focus-visible,
.restart-btn:focus-visible,
.btn-back:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 580px) {
  .question-count-panel {
    padding: 18px 14px;
  }
  .question-count-heading {
    align-items: flex-start;
  }
  .question-count-heading h3 {
    font-size: 1.15rem;
  }
  .question-count-start {
    width: 100%;
    white-space: normal;
  }
  #toast-container {
    bottom: 12px;
    right: 12px;
    left: 12px;
  }
  .toast {
    max-width: 100%;
  }
}