:root {
  --bg: #0b1020;
  --panel: #10162a;
  --panel-2: #0f1530;
  --text: #e7ecf3;
  --muted: #a8b3cf;
  --primary: #6c9cff;
  --primary-strong: #4d83ff;
  --accent: #22d3ee;
  --danger: #ff6b6b;
  --success: #22c55e;
  --warning: #f59e0b;
  --border: #223055;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
  background: linear-gradient(180deg, #0b1020 0%, #0b1228 60%, #0c1432 100%);
  color: var(--text);
}

.container {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(1.1) blur(6px);
  background: linear-gradient(
    180deg,
    rgba(16, 22, 42, 0.95),
    rgba(16, 22, 42, 0.6)
  );
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}
.logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #081127;
  box-shadow: 0 8px 30px rgba(76, 134, 255, 0.35);
}
.brand-text h1 {
  font-size: 1.1rem;
  margin: 0;
}
.brand-text p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.btn {
  background: #1a2342;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.6rem 0.9rem;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.2s ease;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.btn:hover {
  transform: translateY(-1px);
  border-color: #2c3c70;
}
.btn:active {
  transform: translateY(0);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary-strong), var(--accent));
  color: #01122a;
  border: none;
}
.btn-primary:hover {
  filter: brightness(1.05);
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.main {
  padding: 1.2rem 0 2rem;
}
.hero {
  background: radial-gradient(
      1200px 400px at 20% -20%,
      rgba(108, 156, 255, 0.15),
      transparent
    ),
    radial-gradient(
      1200px 400px at 80% -30%,
      rgba(34, 211, 238, 0.12),
      transparent
    );
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem;
  margin-bottom: 1rem;
}
.hero h2 {
  margin: 0 0 0.3rem;
}
.hero p {
  margin: 0;
  color: var(--muted);
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.exam-card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.exam-card h3 {
  margin: 0;
}
.exam-card p {
  margin: 0;
  color: var(--muted);
}

.view {
  display: none;
}
.view.active {
  display: block;
}

.notice {
  margin-top: 1rem;
  padding: 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.notice-error {
  background: #2a1620;
  border-color: #5b253a;
  color: #ffd7e0;
}
.hidden {
  display: none;
}

.exam-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}
.exam-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.timer {
  font-weight: 800;
  font-size: 1.1rem;
  padding: 0.45rem 0.7rem;
  border-radius: 10px;
  background: #09122a;
  border: 1px solid var(--border);
}

.progress {
  height: 10px;
  background: #0d1430;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin: 0.6rem 0 1rem;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  transition: width 0.2s ease;
}

.exam-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1rem;
}
.question-nav {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.8rem;
  max-height: calc(100vh - 250px);
  overflow: auto;
}
.dots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}
.dot {
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0d1430;
  color: var(--muted);
  display: grid;
  place-items: center;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
}
.dot:hover {
  border-color: #2c3c70;
  color: var(--text);
}
.dot.active {
  outline: 2px solid var(--accent);
  color: var(--text);
}
.dot.answered {
  background: #0f2a1b;
  border-color: #1f5f3b;
  color: #a9f3c3;
}

.question-panel {
  display: grid;
  gap: 0.8rem;
}
.question-card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
}
.question-card h3 {
  margin: 0 0 0.5rem;
}
.question-card pre,
.question-card code {
  background: #0c1020;
  border: 1px solid #1b2a4d;
  border-radius: 10px;
  padding: 0.6rem;
  overflow: auto;
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.4;
  margin: 0.5rem 0;
}

.question-card pre {
  max-height: 300px;
  white-space: pre-wrap;
}

.question-card code {
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  font-size: 0.85rem;
}

.choices {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.choice {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.65rem 0.7rem;
  display: flex;
  gap: 0.6rem;
  cursor: pointer;
  background: #0b1230;
  transition: 0.2s ease;
}
.choice:hover {
  border-color: #2c3c70;
}
.choice input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}
.choice.correct {
  border-color: #1f5f3b;
  background: #0f2a1b;
}
.choice.incorrect {
  border-color: #5b253a;
  background: #2a1620;
}

.question-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.question-actions .spacer {
  flex: 1;
}

.result-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}
.result-summary {
  color: var(--muted);
}
.review-list {
  display: grid;
  gap: 0.8rem;
}
.review-item {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.8rem;
}
.review-item h4 {
  margin: 0 0 0.5rem;
}
.answer-pill {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
}
.answer-pill.correct {
  background: #0f2a1b;
  border-color: #1f5f3b;
  color: #a9f3c3;
}
.answer-pill.wrong {
  background: #2a1620;
  border-color: #5b253a;
  color: #ffd7e0;
}

.review-item pre,
.review-item code {
  background: #0c1020;
  border: 1px solid #1b2a4d;
  border-radius: 10px;
  padding: 0.6rem;
  overflow: auto;
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.4;
  margin: 0.5rem 0;
}

.review-item pre {
  max-height: 300px;
  white-space: pre-wrap;
}

.review-item code {
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  font-size: 0.85rem;
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  background: #0b1126;
}
.site-footer .container {
  padding: 0.9rem 0;
  color: var(--muted);
}

.exam-card-title {
  background: #eaf2ff; /* Example heading background */
  color: #2d6cdf;
  font-weight: 600;
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  display: inline-block;
}

.exam-search-input {
  border: 2px solid #2d6cdf; /* Match heading color */
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  color: #222;
  outline: none;
  transition: border-color 0.2s;
}

.exam-search-input:focus {
  border-color: #1a4ca0; /* Slightly darker on focus */
}

.enhanced-search {
  background: #eaf2ff; /* Match hero section background */
  border-radius: 16px;
  padding: 1.5rem 2rem;
  box-shadow: 0 2px 8px rgba(44, 108, 223, 0.07);
  margin-bottom: 2rem;
  border: 1px solid #d0e2ff;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  background: #fff;
  border-radius: 8px;
  border: 2px solid #2d6cdf;
  padding: 0.5rem 1rem;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.search-icon {
  font-size: 1.2rem;
  color: #2d6cdf;
  margin-right: 0.7rem;
}

.exam-search-input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 1rem;
  color: #222;
  width: 100%;
}

.notice-block {
  background: radial-gradient(
      1200px 400px at 20% -20%,
      rgba(108, 156, 255, 0.15),
      transparent
    ),
    radial-gradient(
      1200px 400px at 80% -30%,
      rgba(34, 211, 238, 0.12),
      transparent
    );
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem;
  margin: 1rem auto;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.5;
  width: min(1200px, calc(100% - 2rem)); /* Same sizing as .container */
}

.notice-block strong {
  color: var(--accent);
  font-weight: 600;
}

.tiktok-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.tiktok-link:hover {
  text-decoration: underline;
}

.search-input-wrapper:focus-within {
  border-color: #1a4ca0;
  box-shadow: 0 0 0 2px #b3d1ff;
}

/* Filter Section Styles */
.filter-section {
  margin: 1rem 0 1.5rem 0;
  padding: 1rem;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
}

.filter-section h3 {
  margin: 0 0 0.8rem 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: #0d1430;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
  font-size: 0.9rem;
}

.filter-btn:hover {
  border-color: #2c3c70;
  color: var(--text);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--primary-strong), var(--accent));
  color: #01122a;
  border: none;
  font-weight: 600;
}

.filter-btn.active:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

/* Category Tag Styles */
.category-tag {
  display: inline-block;
  background: #0f2a1b;
  color: #a9f3c3;
  border: 1px solid #1f5f3b;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.exam-card[data-category="Technical Mock Exam"] .category-tag {
  background: #1a2342;
  color: var(--primary);
  border-color: var(--border);
}

.exam-card[data-category="Algorithms"] .category-tag {
  background: #2a1620;
  color: #ffd7e0;
  border-color: #5b253a;
}

.exam-card[data-category="OOP"] .category-tag {
  background: #0f2a1b;
  color: #a9f3c3;
  border-color: #1f5f3b;
}

@media (max-width: 900px) {
  .exam-body {
    grid-template-columns: 1fr;
  }
  .question-nav {
    order: 2;
    max-height: none;
  }
  
  .filter-buttons {
    flex-direction: column;
  }
  
  .filter-btn {
    text-align: center;
  }
}