/* ============================================================
   TOXIQUIZ - Quiz App Styles
   Premium Medical Quiz Design — Toxicología
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-teal: #2dd4bf;
  --accent-teal-glow: rgba(45, 212, 191, 0.3);
  --accent-blue: #3b82f6;
  --accent-blue-glow: rgba(59, 130, 246, 0.3);
  --accent-purple: #a78bfa;
  --accent-purple-glow: rgba(167, 139, 250, 0.3);
  --accent-rose: #fb7185;
  --accent-rose-glow: rgba(251, 113, 133, 0.3);
  --accent-amber: #fbbf24;
  --accent-amber-glow: rgba(251, 191, 36, 0.25);
  --accent-lime: #a3e635;
  --accent-lime-glow: rgba(163, 230, 53, 0.25);
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.12);
  --error: #f87171;
  --error-bg: rgba(248, 113, 113, 0.12);
  --warning: #fbbf24;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-glow: 0 0 40px rgba(45, 212, 191, 0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* --- Animated Background --- */
.bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-gradient .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.12;
  animation: orbFloat 20s ease-in-out infinite;
}

.bg-gradient .orb:nth-child(1) {
  width: 500px;
  height: 500px;
  background: #6d28d9;
  top: -10%;
  left: -10%;
  animation-delay: 0s;
}

.bg-gradient .orb:nth-child(2) {
  width: 400px;
  height: 400px;
  background: var(--accent-rose);
  bottom: -10%;
  right: -10%;
  animation-delay: -7s;
}

.bg-gradient .orb:nth-child(3) {
  width: 300px;
  height: 300px;
  background: var(--accent-amber);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(50px, -30px) scale(1.1); }
  50% { transform: translate(-20px, 40px) scale(0.95); }
  75% { transform: translate(30px, 20px) scale(1.05); }
}

/* --- Main Container --- */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 24px 20px;
  min-height: 100vh;
}

/* --- Header --- */
.app-header {
  text-align: center;
  padding: 40px 0 24px;
}

.app-header .logo-icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, #6d28d9, var(--accent-rose));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  box-shadow: 0 8px 32px rgba(109, 40, 217, 0.35);
  animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { box-shadow: 0 8px 32px rgba(109, 40, 217, 0.35); }
  50% { box-shadow: 0 8px 48px var(--accent-rose-glow); }
}

.app-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #a78bfa, var(--accent-rose), var(--accent-amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.app-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
  font-weight: 400;
}

/* --- Screen Management --- */
.screen {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Full Exam Card --- */
.full-exam-card {
  background: linear-gradient(135deg, rgba(109, 40, 217, 0.15), rgba(251, 113, 133, 0.1));
  border: 1px solid rgba(167, 139, 250, 0.2);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 28px;
}

.full-exam-card:hover {
  border-color: rgba(167, 139, 250, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(109, 40, 217, 0.2);
}

.full-exam-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.full-exam-icon {
  font-size: 2rem;
}

.full-exam-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.full-exam-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.exam-badge {
  background: rgba(167, 139, 250, 0.15) !important;
  color: var(--accent-purple) !important;
  white-space: nowrap;
}

/* --- Section Label --- */
.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* --- Mode Selection Cards --- */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0;
  transition: var(--transition);
}

.mode-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.mode-card:hover::before {
  opacity: 1;
}

/* Card color accents by data-color */
.mode-card[data-color="teal"]::before { background: linear-gradient(90deg, var(--accent-teal), var(--accent-blue)); }
.mode-card[data-color="teal"]:hover { box-shadow: 0 12px 40px var(--accent-teal-glow); }

.mode-card[data-color="blue"]::before { background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal)); }
.mode-card[data-color="blue"]:hover { box-shadow: 0 12px 40px var(--accent-blue-glow); }

.mode-card[data-color="rose"]::before { background: linear-gradient(90deg, var(--accent-rose), var(--accent-purple)); }
.mode-card[data-color="rose"]:hover { box-shadow: 0 12px 40px var(--accent-rose-glow); }

.mode-card[data-color="purple"]::before { background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue)); }
.mode-card[data-color="purple"]:hover { box-shadow: 0 12px 40px var(--accent-purple-glow); }

.mode-card[data-color="amber"]::before { background: linear-gradient(90deg, var(--accent-amber), var(--accent-rose)); }
.mode-card[data-color="amber"]:hover { box-shadow: 0 12px 40px var(--accent-amber-glow); }

.mode-card .mode-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.mode-card .mode-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.3;
}

.mode-card .mode-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.mode-card .mode-badge {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

/* --- Progress Bar --- */
.progress-container {
  margin-bottom: 28px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.progress-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.progress-score {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-teal);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-glass);
  border-radius: 20px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 20px;
  background: linear-gradient(90deg, #6d28d9, var(--accent-rose));
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 20px;
  height: 100%;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 20px;
  filter: blur(4px);
}

/* --- Question Card --- */
.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  backdrop-filter: blur(12px);
  margin-bottom: 20px;
}

.question-number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.65;
  color: var(--text-primary);
}

/* --- Options (Multiple Choice) --- */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.option-btn {
  width: 100%;
  text-align: left;
  padding: 14px 18px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-width: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
}

.option-text {
  flex: 1;
  line-height: 1.5;
  padding-top: 2px;
}

.option-btn:hover:not(.disabled) {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateX(4px);
}

.option-btn:hover:not(.disabled) .option-letter {
  background: rgba(167, 139, 250, 0.2);
  color: var(--accent-purple);
}

.option-btn.correct {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
  animation: correctPop 0.4s ease-out;
}

.option-btn.correct .option-letter {
  background: rgba(52, 211, 153, 0.3);
  color: var(--success);
}

.option-btn.incorrect {
  background: var(--error-bg);
  border-color: var(--error);
  color: var(--error);
  animation: shake 0.4s ease-out;
}

.option-btn.incorrect .option-letter {
  background: rgba(248, 113, 113, 0.3);
  color: var(--error);
}

.option-btn.disabled {
  cursor: default;
  opacity: 0.5;
}

.option-btn.disabled.correct {
  opacity: 1;
}

@keyframes correctPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* --- Feedback / Explanation --- */
.feedback-box {
  margin-top: 16px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.6;
  animation: fadeIn 0.3s ease-out;
  display: none;
}

.feedback-box.show {
  display: block;
}

.feedback-box.correct {
  background: var(--success-bg);
  border: 1px solid rgba(52, 211, 153, 0.2);
  color: var(--success);
}

.feedback-box.incorrect {
  background: var(--error-bg);
  border: 1px solid rgba(248, 113, 113, 0.2);
  color: var(--error);
}

.feedback-box .feedback-icon {
  font-size: 1.2rem;
  margin-right: 8px;
}

.feedback-box .correct-answer {
  display: block;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.feedback-source {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: normal;
}

/* --- Next Button --- */
.next-btn {
  margin-top: 20px;
  width: 100%;
  padding: 14px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: none;
}

.next-btn.show {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

.next-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

/* --- Results Screen --- */
.results-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 40px 28px;
  text-align: center;
  backdrop-filter: blur(12px);
}

.results-card .trophy {
  font-size: 4rem;
  margin-bottom: 16px;
  animation: trophyBounce 1s ease-out;
}

@keyframes trophyBounce {
  0% { transform: scale(0) rotate(-20deg); }
  60% { transform: scale(1.2) rotate(5deg); }
  100% { transform: scale(1) rotate(0deg); }
}

.results-card .result-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.results-card .result-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.score-display {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 32px;
}

.score-item {
  text-align: center;
}

.score-item .score-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #a78bfa, var(--accent-rose));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-item .score-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.result-percentage {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.result-percentage svg {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.result-percentage svg circle {
  fill: none;
  stroke-width: 6;
}

.result-percentage svg .bg-circle {
  stroke: var(--bg-glass);
}

.result-percentage svg .progress-circle {
  stroke: var(--accent-purple);
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s ease-out;
}

.result-percentage .percentage-text {
  font-size: 1.8rem;
  font-weight: 800;
  z-index: 1;
}

/* --- Review Button --- */
.btn-outline {
  width: 100%;
  padding: 12px;
  background: transparent;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 16px;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

/* --- Review List --- */
.review-list {
  text-align: left;
  margin-bottom: 24px;
}

.review-item {
  padding: 16px;
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
}

.review-item.review-correct {
  border-left: 3px solid var(--success);
}

.review-item.review-incorrect {
  border-left: 3px solid var(--error);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.review-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.review-icon {
  font-size: 0.9rem;
}

.review-question {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.review-answer {
  font-size: 0.8rem;
  padding: 4px 0;
  line-height: 1.5;
}

.review-answer.wrong {
  color: var(--error);
}

.review-answer.right {
  color: var(--success);
}

.review-explanation {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.5;
}

.review-source {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Action Buttons --- */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-primary {
  padding: 14px;
  background: linear-gradient(135deg, #6d28d9, var(--accent-rose));
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(109, 40, 217, 0.3);
}

.btn-secondary {
  padding: 14px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* --- Back Button --- */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 20px;
}

.back-btn:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .app-container {
    padding: 16px 14px;
  }

  .app-header h1 {
    font-size: 1.7rem;
  }

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

  .full-exam-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .question-card {
    padding: 24px 18px;
  }

  .question-text {
    font-size: 0.95rem;
  }

  .option-btn {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

  .results-card {
    padding: 28px 18px;
  }

  .score-display {
    gap: 20px;
  }

  .score-item .score-value {
    font-size: 2rem;
  }
}