:root {
  --bg: #050616;
  --bg-elevated: #101321;
  --bg-elevated-soft: #171a2a;
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #e6e7f0;
  --muted: #9ca0b5;
  --accent: #6c9cff;
  --accent-soft: rgba(108, 156, 255, 0.16);
  --danger: #ff6c8a;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.5);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #1a2350 0, transparent 55%),
    radial-gradient(circle at bottom right, #401a60 0, transparent 45%), var(--bg);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(135deg, rgba(7, 10, 30, 0.95), rgba(7, 10, 30, 0.85));
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand h1 {
  margin: 0 0 2px;
  font-size: 1.4rem;
  letter-spacing: 0.04em;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.top-nav {
  display: flex;
  gap: 14px;
  font-size: 0.9rem;
}

.top-nav a {
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  background: transparent;
}

.top-nav a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

main {
  padding: 20px 0 60px;
}

.filters {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr;
  gap: 12px;
  align-items: end;
  margin: 10px 0 18px;
}

.filter-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

.filter-item label {
  padding-left: 2px;
}

.filters input,
.filters select {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(4, 6, 20, 0.85);
  color: #fff;
  outline: none;
}

.filters input::placeholder {
  color: #b3b6c7;
}

.filters input:focus,
.filters select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(108, 156, 255, 0.3);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 8px 0 40px;
}

.card {
  background: rgba(9, 10, 25, 0.96);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-soft);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(108, 156, 255, 0.6);
  box-shadow: 0 22px 55px rgba(0, 0, 0, 0.65);
}

.card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  background: #111;
}

.card-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.card-title {
  font-size: 1.03rem;
  margin: 0;
}

.badge-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.badge {
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 11px;
  background: var(--accent-soft);
  color: #dbe5ff;
}

.badge.level {
  background: rgba(255, 255, 255, 0.06);
  color: #f6f6ff;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.tag-pill {
  font-size: 11px;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
}

.meta {
  color: var(--muted);
  font-size: 11px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.button {
  padding: 8px 10px;
  border-radius: 6px;
  border: 0;
  cursor: pointer;
  background: #1e1f2b;
  color: #fff;
  text-decoration: none;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.button.secondary {
  background: #2a2b3a;
}

.button:hover {
  filter: brightness(1.06);
}

.empty {
  text-align: center;
  color: var(--muted);
  margin: 32px 0 40px;
}

/* Modal styles */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  padding: 16px;
  z-index: 999;
}

.modal.open {
  display: flex;
}

.modal-content {
  position: relative;
  width: min(860px, 100%);
  max-height: 82vh;
  overflow: auto;
  background: #050714;
  border-radius: 14px;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 16px;
  background: transparent;
  border: 0;
  font-size: 26px;
  color: #fff;
  cursor: pointer;
}

.modal-media {
  display: flex;
  gap: 8px;
  padding: 6px 6px 0;
  flex-wrap: wrap;
}

.modal-media img {
  height: 150px;
  width: auto;
  border-radius: 6px;
  object-fit: cover;
}

.modal-body {
  padding: 4px 6px 6px;
}

.modal-description {
  margin: 4px 0 8px;
  color: #e0e2f2;
  font-size: 0.9rem;
}

.modal-body .card-title {
  font-weight: 600;
}

.legal-section {
  padding: 32px 0;
  background: rgba(3, 5, 18, 0.9);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.legal-section h2 {
  margin-top: 0;
}

.legal-section p {
  color: var(--muted);
  max-width: 720px;
}

.legal-section ul {
  color: var(--muted);
  padding-left: 18px;
  max-width: 720px;
}

.site-footer {
  padding: 18px 0 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: #050616;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.footer-inner a {
  color: var(--muted);
}

.footer-inner a:hover {
  color: #fff;
}

.dimension-switch {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px;
    border-radius: var(--radius-md);
    width: fit-content;
}

.dim-btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.dim-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

.dim-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(108, 156, 255, 0.3);
}

@media (max-width: 600px) {
    .dimension-switch {
        width: 100%;
        justify-content: space-between;
    }
    .dim-btn {
        flex: 1;
        text-align: center;
    }
}

/* Responsive tweaks */
@media (max-width: 900px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-nav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

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

  .modal-media img {
    height: 130px;
  }
}

@media (max-width: 600px) {
  .card img {
    height: 150px;
  }

  .modal-content {
    max-height: 88vh;
  }

  .top-nav a {
    padding-inline: 8px;
  }
}