/* ==========================================================================
   Narnia Labs – Open Datasets
   Design-system tokens extracted from the provided style guide.
   ========================================================================== */

/* --- Design Tokens (CSS Custom Properties) --- */
:root {
  /* Purple palette */
  --purple-050: #F7F3FF;
  --purple-100: #EFE6FF;
  --purple-200: #D4C3FE;
  --purple-300: #B69AFE;
  --purple-400: #966EFF;
  --purple-500: #794CFF;
  --purple-600: #5524FD;
  --purple-700: #4620F6;
  --purple-800: #3E20C2;
  --purple-900: #3115AB;
  --purple-950: #2406A9;

  /* Gray palette */
  --gray-050: #F9FAFC;
  --gray-100: #F3F4F8;
  --gray-200: #E6E8EF;
  --gray-300: #D3D6DF;
  --gray-400: #AEB4C2;
  --gray-500: #8891A4;
  --gray-600: #5D6779;
  --gray-700: #3A4454;
  --gray-800: #283140;
  --gray-900: #1F2935;
  --gray-950: #141D26;

  /* Spacing (space-xxx) */
  --space-025: 2px;
  --space-050: 4px;
  --space-075: 6px;
  --space-100: 8px;
  --space-125: 10px;
  --space-150: 12px;
  --space-200: 16px;
  --space-250: 20px;
  --space-300: 24px;
  --space-400: 32px;
  --space-500: 40px;
  --space-600: 48px;
  --space-700: 56px;
  --space-800: 64px;
  --space-900: 72px;

  /* Border radius */
  --radius-100: 4px;
  --radius-150: 6px;
  --radius-200: 8px;
  --radius-300: 12px;
  --radius-400: 16px;
  --radius-500: 20px;
  --radius-600: 24px;

  /* Box shadow */
  --shadow-sm: 0px 1px 10px 0px rgba(100,111,124,0.20);
  --shadow-md: 3px 3px 16px 0px rgba(100,111,124,0.20);
  --shadow-lg: 5px 5px 20px 0px rgba(100,111,124,0.20);
  --shadow-xl: 0px 0px 30px 0px rgba(100,111,124,0.20);

  /* Typography (Inter) */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Semantic colours */
  --color-bg: #FFFFFF;
  --color-bg-subtle: var(--gray-050);
  --color-text: var(--gray-900);
  --color-text-secondary: var(--gray-600);
  --color-text-tertiary: var(--gray-500);
  --color-border: var(--gray-200);
  --color-primary: var(--purple-600);
  --color-primary-hover: var(--purple-700);
  --color-primary-subtle: var(--purple-050);
}

/* --- Reset / Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-family);
  font-size: 15px; /* body1 = font-size-150 roughly 15px */
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0;
  color: var(--color-text);
  background: var(--color-bg);
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-300);
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-100);
}
.nav-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-075);
  font-family: var(--font-family);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  padding: var(--space-075) var(--space-150);
  border: none;
  border-radius: var(--radius-200);
  background: transparent;
  text-decoration: none;
  transition: background 0.2s;
}
.nav-cta:hover {
  background: var(--gray-100);
}

/* --- Hero --- */
.hero {
  padding: var(--space-900) 0 var(--space-700);
  text-align: center;
  background: linear-gradient(180deg, var(--purple-050) 0%, var(--color-bg) 100%);
}
.hero-eyebrow {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-primary);
  margin-bottom: var(--space-200);
}
.hero-title {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--color-text);
  margin-bottom: var(--space-300);
}
.hero-description {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* --- Dataset Cards Section --- */
.datasets-section {
  padding: var(--space-600) 0 var(--space-900);
}
.datasets-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-400);
}
.dataset-card {
  display: flex;
  flex-direction: row;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-400);
  overflow: hidden;
  background: var(--color-bg);
  transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s;
}
.dataset-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--purple-200);
  transform: translateY(-4px);
}
.dataset-card-image {
  flex: 0 0 280px;
  /* background: var(--gray-100);*/
  background: var(--gray-900);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  /* padding: var(--space-500); */
}
.dataset-card-image img {
  width: 50%;
  height: auto;
  object-fit: contain;
  transition: transform 0.4s;
}

.dataset-card-image iframe {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.4s;
}

.dataset-card:hover .dataset-card-image img {
  transform: scale(1.06);
}

.dataset-card:hover .dataset-card-image iframe {
  transform: scale(1.06);
}

.dataset-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-400);
  gap: var(--space-150);
}
.dataset-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-100);
}
.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  padding: var(--space-050) var(--space-125);
  border-radius: var(--radius-100);
  background: var(--purple-050);
  color: var(--purple-700);
}
.dataset-card-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-050);
}
.dataset-card-subtitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
.dataset-card-desc {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-tertiary);
  line-height: 1.7;
  flex: 1;
}
.dataset-card-stats {
  display: flex;
  gap: var(--space-400);
  padding-top: var(--space-200);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-100);
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}
.stat-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-tertiary);
}
.dataset-card-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-075);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: var(--space-100);
  transition: gap 0.2s;
}
.dataset-card:hover .dataset-card-cta {
  gap: var(--space-150);
}

/* --- Detail Page --- */
.detail-hero {
  padding: var(--space-700) 0 var(--space-500);
  background: linear-gradient(180deg, var(--purple-050) 0%, var(--color-bg) 100%);
}
.detail-hero .breadcrumb {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-300);
}
.detail-hero .breadcrumb a {
  color: var(--color-primary);
}
.detail-hero .breadcrumb a:hover {
  text-decoration: underline;
}
.detail-hero-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-400);
  flex-wrap: wrap;
}
.detail-hero-header h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}
.detail-hero-header p.subtitle {
  font-size: 17px;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-top: var(--space-100);
  max-width: 600px;
  line-height: 1.7;
}
.detail-hero-actions {
  display: flex;
  gap: var(--space-150);
  flex-shrink: 0;
  margin-top: var(--space-050);
}

/* Buttons – design system primary style */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-100);
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 600;
  padding: var(--space-125) var(--space-250);
  border-radius: var(--radius-200);
  border: none;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--gray-050);
  border-color: var(--gray-300);
}

/* Stats bar */
.detail-stats {
  display: flex;
  gap: var(--space-600);
  padding: var(--space-400) 0;
  margin-top: var(--space-400);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.detail-stat {
  display: flex;
  flex-direction: column;
}
.detail-stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
}
.detail-stat-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-tertiary);
}

/* Content body */
.detail-content {
  padding: var(--space-600) 0 var(--space-900);
}
.detail-content .container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-700);
  align-items: start;
}
.detail-main h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: var(--space-200);
  margin-top: var(--space-600);
  color: var(--color-text);
}
.detail-main h2:first-child {
  margin-top: 0;
}
.detail-main p {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-200);
}
.detail-main ul {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-300);
}
.detail-main ul li {
  position: relative;
  padding-left: var(--space-250);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-075);
}
.detail-main ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* File table */
.file-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-200) 0 var(--space-400);
  font-size: 14px;
}
.file-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-tertiary);
  padding: var(--space-125) var(--space-200);
  border-bottom: 2px solid var(--color-border);
}
.file-table tbody td {
  padding: var(--space-150) var(--space-200);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}
.file-table tbody tr:last-child td {
  border-bottom: none;
}
.file-table code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: var(--radius-100);
  color: var(--purple-700);
}

/* Sidebar */
.detail-sidebar {
  position: sticky;
  top: 88px;
}
.sidebar-card {
  background: var(--gray-050);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-300);
  padding: var(--space-300);
  margin-bottom: var(--space-300);
}
.sidebar-card h3 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-200);
}
.sidebar-item {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: var(--space-075) 0;
}
.sidebar-item-label {
  color: var(--color-text-secondary);
}
.sidebar-item-value {
  font-weight: 600;
  color: var(--color-text);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-400) 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-150);
}
.footer-copyright {
  font-size: 13px;
  color: var(--color-text-tertiary);
}
.footer-links a {
  font-size: 13px;
  color: var(--color-text-tertiary);
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--color-primary);
}

/* --- Animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-eyebrow, .hero-title, .hero-description {
  animation: fadeUp 0.6s ease-out backwards;
}
.hero-title { animation-delay: 0.1s; }
.hero-description { animation-delay: 0.2s; }
.dataset-card {
  animation: fadeUp 0.5s ease-out backwards;
}
.dataset-card:nth-child(1) { animation-delay: 0.25s; }
.dataset-card:nth-child(2) { animation-delay: 0.35s; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero { padding: var(--space-600) 0 var(--space-500); }
  .hero-title { font-size: 30px; }
  .hero-description { font-size: 15px; }

  .datasets-grid { grid-template-columns: 1fr; }
  .dataset-card { flex-direction: column; }
  .dataset-card-image { flex: none; aspect-ratio: 16 / 10; }

.detail-hero-header { flex-direction: column; }
  .detail-hero-header h1 { font-size: 28px; }
  .detail-stats { flex-wrap: wrap; gap: var(--space-300); }

  .detail-content .container {
    grid-template-columns: 1fr;
  }
  .detail-sidebar {
    position: static;
  }

  .footer-inner { flex-direction: column; gap: var(--space-200); text-align: center; }
}

@media (max-width: 480px) {
  .dataset-card-stats { flex-direction: column; gap: var(--space-150); }
  .detail-stats { flex-direction: column; gap: var(--space-200); }
  .detail-hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}