/* ===== Root Variables ===== */
:root {
  --primary: #4A6CF7;
  --primary-light: #6B8AFF;
  --primary-dark: #3458D6;
  --secondary: #6C63FF;
  --accent: #FF6B6B;
  --bg: #F0F4FF;
  --card-bg: #FFFFFF;
  --text-primary: #1A2332;
  --text-secondary: #5A6B7C;
  --shadow: 0 8px 30px rgba(74, 108, 247, 0.12);
  --shadow-hover: 0 12px 40px rgba(74, 108, 247, 0.20);
  --radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
}

/* ===== Stats Bar ===== */
#stats {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  display: flex;
  justify-content: center;
  gap: 3rem;
  font-weight: 500;
  margin: 1.5rem 0 2.5rem;
  box-shadow: var(--shadow);
}

#stats strong {
  opacity: 0.8;
  font-weight: 400;
}

#stats span {
  font-weight: 700;
  font-size: 1.2rem;
}

/* ===== Topic Grid ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.topic-card {
  background: var(--card-bg);
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(74, 108, 247, 0.06);
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: var(--transition);
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

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

.topic-card h2, .topic-card h3 {
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.topic-card h2 {
  font-size: 1.3rem;
  color: var(--primary);
}

.topic-card h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.topic-card p {
  margin: 0.25rem 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.topic-card .question-count {
  display: inline-block;
  background: var(--bg);
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  margin-top: 0.5rem;
}

/* ===== Featured Card (Question Bank) ===== */
.topic-card.featured-card {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
}

.topic-card.featured-card h2,
.topic-card.featured-card p {
  color: white;
}

.topic-card.featured-card .question-count {
  background: rgba(255,255,255,0.2);
  color: white;
}

.topic-card.featured-card::before {
  background: rgba(255,255,255,0.3);
}

/* ===== Question Page Styles ===== */
.question-container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.question-container .level-badge {
  display: inline-block;
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
}

.level-easy { background: #E8F5E9; color: #2E7D32; }
.level-medium { background: #FFF3E0; color: #E65100; }
.level-difficult { background: #FBE9E7; color: #BF360C; }
.level-challenging { background: #F3E5F5; color: #6A1B9A; }

.question-container .question-text {
  font-size: 1.25rem;
  font-weight: 500;
  margin: 1rem 0;
}

.question-container pre {
  background: #1A2332;
  color: #E3E8F0;
  padding: 1.25rem;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.9rem;
  margin: 1rem 0;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.options button {
  background: var(--bg);
  border: 2px solid transparent;
  padding: 0.9rem 1.25rem;
  border-radius: 10px;
  text-align: left;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-primary);
}

.options button:hover {
  background: #E8EDFF;
  border-color: var(--primary-light);
}

.options button.correct {
  background: #E8F5E9;
  border-color: #4CAF50;
  color: #1B5E20;
}

.options button.wrong {
  background: #FFEBEE;
  border-color: #EF5350;
  color: #B71C1C;
}

.options button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.hint-box {
  background: #FFF8E1;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  border-left: 4px solid #FFC107;
  margin: 1rem 0;
  font-size: 0.95rem;
  color: #4A3A00;
}

.hint-box strong {
  color: #F57F17;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  margin: 1.5rem 0;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

.nav-buttons {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
}

.nav-buttons button {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.nav-buttons .prev-btn {
  background: var(--bg);
  color: var(--text-primary);
}

.nav-buttons .prev-btn:hover {
  background: #E8EDFF;
}

.nav-buttons .next-btn {
  background: var(--primary);
  color: white;
}

.nav-buttons .next-btn:hover {
  background: var(--primary-dark);
  transform: translateX(2px);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  #stats {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    padding: 1rem;
  }
  
  .topic-grid {
    grid-template-columns: 1fr;
  }
  
  .question-container {
    padding: 1.5rem;
  }
}

/*

body{
    font-family:
        system-ui,
        sans-serif;

    font-size:18px;

    line-height:1.6;

    background:#fafafa;

    margin:0;
}

.container{

    max-width:900px;

    margin:auto;

    padding:20px;
}

.dashboard{

    display:flex;

    gap:30px;

    font-size:1.1rem;

    margin-bottom:20px;
}

.topic-grid{

    display:grid;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(240px,1fr)
        );

    gap:20px;
}

.topic-card{

    background:white;

    border:1px solid #ddd;

    border-radius:12px;

    padding:20px;

    text-decoration:none;

    color:inherit;

    transition:0.2s;
}

.topic-card:hover{

    transform:
        translateY(-4px);

    box-shadow:
        0 4px 15px
        rgba(0,0,0,.08);
}

.featured-card{

    grid-column:1/-1;

    border:2px solid #2563eb;

    background:#eff6ff;
}

.back-link{

    text-decoration:none;

    font-weight:600;
}

.progress-bar{

    height:18px;

    background:#ddd;

    border-radius:999px;

    overflow:hidden;

    margin-bottom:25px;
}

.progress-fill{

    height:18px;

    background:#16a34a;

    width:0;

    transition:0.3s;
}

.question-card{

    background:white;

    border-radius:12px;

    padding:24px;

    box-shadow:
        0 3px 12px
        rgba(0,0,0,.08);
}

.choice{

    display:block;

    margin:12px 0;

    padding:12px;

    border:1px solid #ddd;

    border-radius:8px;

    cursor:pointer;
}

.choice:hover{

    background:#f5f5f5;
}

button{

    background:#2563eb;

    color:white;

    border:none;

    border-radius:8px;

    padding:12px 24px;

    font-size:16px;

    cursor:pointer;
}

button:hover{

    opacity:.9;
}

pre{

    background:#1e293b;

    color:white;

    padding:18px;

    border-radius:10px;

    overflow-x:auto;

    font-size:16px;
}

.badge{

    display:inline-block;

    padding:5px 12px;

    border-radius:999px;

    color:white;

    font-weight:700;

    margin-bottom:15px;
}

.badge.easy{
    background:#16a34a;
}

.badge.medium{
    background:#ea580c;
}

.badge.hard{
    background:#dc2626;
}

.correct{
    color:green;
}

.incorrect{
    color:#dc2626;
    font-weight:600;
}

.bank-question{

    background:white;

    border-radius:10px;

    padding:20px;

    margin:15px 0;

    box-shadow:
        0 2px 10px
        rgba(0,0,0,.05);
}

.completion-card{

    background:white;

    padding:30px;

    border-radius:12px;

    text-align:center;
}

@media (max-width:768px){

    body{
        font-size:17px;
    }

    .container{
        padding:15px;
    }

    .dashboard{
        flex-direction:column;
        gap:10px;
    }

    button{
        width:100%;
    }
}
*/