/* ══════════════════════════════════════
   SABER UnB — Economia Quiz
   Identidade Visual: Verde UnB + Azul Darcy
   ══════════════════════════════════════ */

:root {
  --verde: #006039;
  --verde-light: #007a49;
  --verde-pale: #e8f5ee;
  --azul: #004D80;
  --azul-light: #0062a0;
  --azul-pale: #e6f0f8;
  --offwhite: #f8f9fa;
  --white: #ffffff;
  --text-dark: #1a2332;
  --text-mid: #4a5568;
  --text-light: #8a9ab0;
  --border: #e2e8f0;
  --correct: #22a05b;
  --wrong: #e53e3e;
  --warning: #dd6b20;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 6px 24px rgba(0,0,0,.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.14);

  --transition: .25s cubic-bezier(.4,0,.2,1);
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--offwhite);
  color: var(--text-dark);
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ── SCREENS ── */
.screen {
  display: none;
  min-height: 100dvh;
  animation: fadeSlide .35s var(--transition) both;
}
.screen.active { display: flex; flex-direction: column; }

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── LOADER ── */
.loader-overlay {
  position: fixed; inset: 0;
  background: rgba(248,249,250,.92);
  backdrop-filter: blur(6px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 999;
  font-size: .95rem;
  color: var(--text-mid);
}
.loader-overlay.visible { display: flex; }

.loader-spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--verde);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════
   TELA 1 — WELCOME
   ══════════════════════════════════════ */
#screen-welcome {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #003d25 0%, #006039 50%, #004D80 100%);
}

.welcome-bg {
  position: absolute; inset: 0;
  pointer-events: none; overflow: hidden;
}

.bg-circle {
  position: absolute; border-radius: 50%;
  opacity: .15; filter: blur(60px);
}
.c1 { width: 500px; height: 500px; background: #00e07f; top: -120px; right: -100px; animation: drift 12s ease-in-out infinite alternate; }
.c2 { width: 350px; height: 350px; background: #0090ff; bottom: -80px; left: -60px; animation: drift 16s ease-in-out 2s infinite alternate-reverse; }
.c3 { width: 200px; height: 200px; background: #fff; top: 50%; left: 40%; animation: drift 10s ease-in-out 1s infinite alternate; }

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

.welcome-content {
  position: relative; z-index: 1;
  flex: 1;
  display: flex; flex-direction: column;
  align-items: flex-start;
  padding: clamp(40px, 8vw, 80px) clamp(24px, 6vw, 72px);
  max-width: 640px;
  gap: 24px;
}

.logo-badge {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(8px);
  padding: 6px 16px; border-radius: 100px;
  color: rgba(255,255,255,.9);
  font-size: .8rem; font-weight: 500; letter-spacing: .05em;
}
.logo-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #4dffab;
  box-shadow: 0 0 8px #4dffab;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: .6; }
}

.hero-title {
  font-family: 'Fraunces', serif;
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--white);
}
.hero-name {
  background: linear-gradient(90deg, #4dffab, #80d8ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: rgba(255,255,255,.75);
  line-height: 1.6;
  max-width: 420px;
}
.hero-subtitle strong { color: rgba(255,255,255,.95); }

/* ── BUTTONS ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--white);
  color: var(--verde);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem; font-weight: 600;
  padding: 14px 28px;
  border: none; border-radius: var(--radius-xl);
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,.2);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,.25);
  background: #f0fff8;
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
  opacity: .4; cursor: not-allowed;
  background: var(--border); color: var(--text-light);
  box-shadow: none;
}

.btn-secondary {
  display: inline-flex; align-items: center; gap: 10px;
  background: transparent;
  color: var(--verde);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem; font-weight: 600;
  padding: 14px 28px;
  border: 2px solid var(--verde);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}
.btn-secondary:hover {
  background: var(--verde-pale);
  transform: translateY(-2px);
}

.btn-start {
  font-size: 1.15rem;
  padding: 18px 40px;
}

/* ── DISCLAIMER ── */
.disclaimer-card {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 0;
  color: rgba(255,255,255,.85);
  font-size: .88rem;
  max-width: 520px;
  width: 100%;
}

.disclaimer-toggle {
  list-style: none;
  display: flex; align-items: center; gap: 8px;
  padding: 14px 20px;
  cursor: pointer;
  font-weight: 500;
  user-select: none;
}
.disclaimer-toggle::-webkit-details-marker { display: none; }
.disclaimer-toggle:hover { color: white; }

.disclaimer-body {
  padding: 0 20px 18px;
  display: flex; flex-direction: column; gap: 10px;
  border-top: 1px solid rgba(255,255,255,.15);
  line-height: 1.6;
}
.ref-block {
  background: rgba(255,255,255,.08);
  border-left: 3px solid #4dffab;
  padding: 12px 16px; border-radius: 4px;
  font-size: .82rem;
  display: flex; flex-direction: column; gap: 4px;
}
.disclaimer-note {
  font-size: .82rem; font-style: italic;
  opacity: .75;
}

/* ══════════════════════════════════════
   TELA 2 — CONFIG
   ══════════════════════════════════════ */
#screen-config {
  background: var(--offwhite);
}

.screen-header {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}

.btn-back {
  width: 40px; height: 40px;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-dark);
  transition: border-color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.btn-back:hover { border-color: var(--verde); background: var(--verde-pale); color: var(--verde); }

.header-brand {
  display: flex; align-items: baseline; gap: 4px;
}
.brand-saber {
  font-family: 'Fraunces', serif;
  font-size: 1.4rem; font-weight: 900;
  background: linear-gradient(135deg, var(--verde), var(--azul));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand-unb {
  font-size: .9rem; font-weight: 600;
  color: var(--text-mid);
}

.config-body {
  flex: 1;
  padding: 32px 24px 40px;
  display: flex; flex-direction: column; gap: 32px;
  max-width: 680px; width: 100%; margin: 0 auto;
}

.config-title {
  font-family: 'Fraunces', serif;
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-dark);
}
.config-title span {
  background: linear-gradient(135deg, var(--verde), var(--azul));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.config-section { display: flex; flex-direction: column; gap: 12px; }

.section-label {
  font-size: .82rem; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-mid);
}
.section-label-row {
  display: flex; align-items: center; justify-content: space-between;
}

/* Toggle Prova */
.toggle-group {
  display: flex; gap: 10px;
}

.toggle-btn {
  flex: 1;
  padding: 12px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--white);
  font-family: 'DM Sans', sans-serif;
  font-size: .95rem; font-weight: 600;
  color: var(--text-mid);
  cursor: pointer;
  transition: all var(--transition);
}
.toggle-btn.active {
  border-color: var(--verde);
  background: var(--verde-pale);
  color: var(--verde);
  box-shadow: var(--shadow-sm);
}
.toggle-btn:hover:not(.active):not(:disabled) {
  border-color: var(--verde-light);
  color: var(--verde-light);
}
.toggle-btn:disabled {
  opacity: .45; cursor: not-allowed;
  background: #f1f3f5;
}

/* Chapters grid */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
}

.chapter-chip {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
  transition: all var(--transition);
  font-size: .85rem; font-weight: 500; color: var(--text-mid);
  user-select: none;
}
.chapter-chip input { display: none; }
.chapter-chip .chip-check {
  width: 16px; height: 16px; border-radius: 4px;
  border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}
.chapter-chip.checked {
  border-color: var(--verde);
  background: var(--verde-pale);
  color: var(--verde);
}
.chapter-chip.checked .chip-check {
  border-color: var(--verde);
  background: var(--verde);
}
.chapter-chip.checked .chip-check::after {
  content: '';
  width: 8px; height: 5px;
  border-left: 2px solid white;
  border-bottom: 2px solid white;
  transform: rotate(-45deg) translateY(-1px);
  display: block;
}
.chapter-chip:hover:not(.checked) { border-color: #b0c4b1; color: var(--verde); }

.select-actions {
  display: flex; gap: 8px; align-items: center;
  font-size: .8rem; color: var(--text-light);
}
.link-btn {
  background: none; border: none; cursor: pointer;
  color: var(--azul); font-weight: 600;
  font-size: .8rem; font-family: 'DM Sans', sans-serif;
  transition: color var(--transition);
}
.link-btn:hover { color: var(--verde); text-decoration: underline; }

/* Range */
.range-wrapper {
  display: flex; align-items: center; gap: 12px;
}
.range-limit { font-size: .82rem; font-weight: 600; color: var(--text-light); }

input[type="range"] {
  flex: 1; -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 99px;
  background: linear-gradient(to right, var(--verde) 0%, var(--verde) var(--val, 50%), var(--border) var(--val, 50%));
  outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--verde);
  border: 3px solid white;
  box-shadow: 0 2px 8px rgba(0,96,57,.3);
  transition: transform var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

.qty-display {
  font-size: 1.6rem; font-weight: 700;
  color: var(--verde);
  font-family: 'Fraunces', serif;
  min-width: 2.5ch; text-align: right;
}

.config-footer {
  display: flex; flex-direction: column; gap: 12px;
  padding-top: 8px;
}
.config-info {
  font-size: .85rem; color: var(--text-mid);
  text-align: center;
}
.config-footer .btn-primary { width: 100%; justify-content: center; padding: 16px; }

/* ══════════════════════════════════════
   TELA 3 — QUIZ
   ══════════════════════════════════════ */
#screen-quiz {
  background: var(--offwhite);
}

.quiz-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 0;
  position: sticky; top: 0; z-index: 5;
}
.quiz-meta {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px;
}

.btn-back-quiz {
  width: 34px; height: 34px; flex-shrink: 0;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-mid);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.btn-back-quiz:hover { border-color: var(--verde); background: var(--verde-pale); color: var(--verde); }

/* Ghost link — Favoritos */
.btn-ghost-link {
  display: inline-flex; align-items: center; gap: 7px;
  color: rgba(255,255,255,.55);
  font-size: .82rem; font-weight: 500;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,.2);
  padding: 7px 16px; border-radius: 100px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  width: fit-content;
}
.btn-ghost-link:hover {
  color: rgba(255,255,255,.9);
  border-color: rgba(255,255,255,.4);
  background: rgba(255,255,255,.08);
}


.quiz-chapter-tag {
  font-size: .78rem; font-weight: 700; letter-spacing: .06em;
  text-transform: uppercase;
  background: var(--verde-pale);
  color: var(--verde);
  padding: 4px 12px; border-radius: 100px;
}
.quiz-counter {
  font-size: .9rem; font-weight: 600; color: var(--text-mid);
}

.progress-bar-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 0;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--verde), var(--azul));
  border-radius: 99px;
  transition: width .4s cubic-bezier(.4,0,.2,1);
  width: 0%;
}

.quiz-body {
  flex: 1; padding: 32px 24px;
  max-width: 680px; width: 100%; margin: 0 auto;
}

.question-command {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  line-height: 1.7;
  color: var(--text-dark);
  font-weight: 500;
  margin-bottom: 28px;
}

.alternatives-list {
  list-style: none;
  display: flex; flex-direction: column; gap: 12px;
}

.alt-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--white);
  cursor: pointer;
  transition: all var(--transition);
  animation: altAppear .3s ease both;
}
.alt-item:nth-child(1) { animation-delay: .05s; }
.alt-item:nth-child(2) { animation-delay: .10s; }
.alt-item:nth-child(3) { animation-delay: .15s; }
.alt-item:nth-child(4) { animation-delay: .20s; }

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

.alt-item:hover:not(.selected) {
  border-color: var(--verde-light);
  background: var(--verde-pale);
  transform: translateX(4px);
}
.alt-item.selected {
  border-color: var(--verde);
  background: var(--verde-pale);
  box-shadow: 0 0 0 4px rgba(0,96,57,.1);
}

.alt-letter {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--offwhite);
  border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .82rem;
  color: var(--text-mid);
  flex-shrink: 0; line-height: 1;
  transition: all var(--transition);
}
.alt-item.selected .alt-letter {
  background: var(--verde);
  border-color: var(--verde);
  color: white;
}

.alt-text {
  font-size: .95rem; line-height: 1.55; color: var(--text-dark);
  padding-top: 4px;
}

.quiz-footer {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px;
  position: sticky; bottom: 0;
}
.quiz-footer .btn-primary,
.quiz-footer .btn-secondary { flex: 1; justify-content: center; }

/* ══════════════════════════════════════
   TELA 4 — RESULTS
   ══════════════════════════════════════ */
#screen-results {
  background: var(--offwhite);
}

.results-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
}
.results-header .header-brand { margin: 0 auto; }

.results-hero {
  background: linear-gradient(160deg, #003d25 0%, #006039 60%, #004D80 100%);
  padding: 40px 24px;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}

.score-ring {
  position: relative; width: 140px; height: 140px;
}
.score-ring svg { transform: rotate(-90deg); width: 100%; height: 100%; }
.ring-bg { fill: none; stroke: rgba(255,255,255,.15); stroke-width: 10; }
.ring-fill {
  fill: none;
  stroke: url(#scoreGradient);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1) .3s;
}

/* inject gradient via JS */
.score-text {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
}
.score-pct {
  font-family: 'Fraunces', serif;
  font-size: 2rem; font-weight: 900; color: white; line-height: 1;
}
.score-label { font-size: .75rem; color: rgba(255,255,255,.7); font-weight: 500; }

.score-message {
  font-size: 1.1rem; font-weight: 600;
  color: rgba(255,255,255,.9); text-align: center;
}

/* Result cards */
.results-summary {
  flex: 1;
  padding: 24px;
  display: flex; flex-direction: column; gap: 16px;
  max-width: 720px; width: 100%; margin: 0 auto;
}

.result-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.result-card-header {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
}
.result-icon {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 2px;
  font-weight: 800; font-size: .75rem;
}
.result-icon.correct { background: #e8f5ee; color: var(--correct); }
.result-icon.wrong   { background: #fde8e8; color: var(--wrong);   }

.result-q-num {
  font-size: .75rem; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; color: var(--text-light); margin-bottom: 4px;
}
.result-command {
  font-size: .9rem; line-height: 1.55; color: var(--text-dark); font-weight: 500;
}

.result-card-body {
  padding: 14px 20px;
  display: flex; flex-direction: column; gap: 8px;
}

.result-answer-row {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: .85rem;
}
.answer-tag {
  font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; padding: 3px 10px; border-radius: 100px;
  flex-shrink: 0; margin-top: 1px;
}
.answer-tag.user-correct { background: #e8f5ee; color: var(--correct); }
.answer-tag.user-wrong   { background: #fde8e8; color: var(--wrong);   }
.answer-tag.correct-ans  { background: #e8f5ee; color: var(--correct); }

.result-justification {
  margin-top: 6px;
  padding: 12px 14px;
  background: var(--offwhite);
  border-left: 3px solid var(--azul);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .82rem; color: var(--text-mid); line-height: 1.6;
}
.just-label { font-weight: 700; color: var(--azul); margin-bottom: 4px; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }

.results-actions {
  display: flex; gap: 12px; padding: 20px 24px 40px;
  max-width: 720px; width: 100%; margin: 0 auto;
}
.results-actions button { flex: 1; justify-content: center; }

/* ══════════════════════════════════════
   UTILITIES & RESPONSIVE
   ══════════════════════════════════════ */

/* Custom scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* Tooltip for disabled */
[data-tooltip] { position: relative; }
[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translateX(-50%);
  background: var(--text-dark); color: white;
  font-size: .75rem; white-space: nowrap;
  padding: 4px 10px; border-radius: var(--radius-sm);
  pointer-events: none; z-index: 99;
}

@media (max-width: 480px) {
  .welcome-content { padding: 40px 20px; }
  .config-body { padding: 24px 16px 40px; }
  .quiz-body { padding: 24px 16px; }
  .results-summary { padding: 16px; }
  .results-actions { padding: 16px 16px 32px; }
  .chapters-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
  .quiz-footer { padding: 12px 16px; }
}

@media (min-width: 768px) {
  .quiz-footer { max-width: 680px; margin: 0 auto; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
}