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

/* CSS Custom Properties & Design Tokens */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Premium Color Palette (Dark Mode First) */
  --bg-main: #090c15;
  --bg-surface: rgba(17, 24, 43, 0.75);
  --bg-surface-hover: rgba(26, 36, 64, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(139, 92, 246, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #8b5cf6; /* Violet */
  --accent-primary-glow: rgba(139, 92, 246, 0.25);
  --accent-secondary: #06b6d4; /* Cyan */
  --accent-secondary-glow: rgba(6, 182, 212, 0.25);
  --accent-tertiary: #ec4899; /* Pink */

  --status-success: #10b981; /* Emerald */
  --status-success-bg: rgba(16, 185, 129, 0.1);
  --status-error: #ef4444; /* Red */
  --status-error-bg: rgba(239, 68, 68, 0.1);
  --status-warning: #f59e0b; /* Amber */
  --status-warning-bg: rgba(245, 158, 11, 0.15);

  --glass-blur: blur(12px);
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 16px -6px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.7);

  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Global Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

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

a:hover {
  color: var(--accent-primary);
}

h1, h2, h3, h4, h5 {
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, #fff 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.8rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin: 2.5rem 0 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  color: var(--accent-tertiary);
}

pre {
  background-color: rgba(10, 15, 30, 0.95);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  position: relative;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e2e8f0;
  font-size: 0.875rem;
}

/* Layout Elements */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  flex-grow: 1;
  padding: 4rem 0;
}

/* Navigation Header (Glassmorphic) */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(9, 12, 21, 0.7);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 800;
  font-size: 1.25rem;
  background: linear-gradient(to right, var(--accent-secondary), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  font-size: 0.8rem;
  background: var(--accent-primary-glow);
  border: 1px solid var(--accent-primary);
  color: var(--text-primary);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  -webkit-text-fill-color: var(--text-primary);
}

nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

nav a {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

nav a:hover, nav a.active {
  color: var(--text-primary);
}

nav .github-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

nav .github-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  background-color: rgba(7, 10, 18, 0.9);
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

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

.footer-links a:hover {
  color: var(--text-secondary);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 5rem 0;
  position: relative;
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-primary-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
  filter: blur(40px);
}

.hero h1 {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff 40%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, #7c3aed 100%);
  color: white;
  box-shadow: 0 4px 14px 0 var(--accent-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(139, 92, 246, 0.4);
  color: white;
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

/* Glassmorphic Grid / Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

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

@media (min-width: 768px) {
  .pillars-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.card {
  background-color: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg), 0 0 20px 0 var(--accent-primary-glow);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-description {
  font-size: 0.925rem;
  color: var(--text-secondary);
  flex-grow: 1;
  margin-bottom: 1.5rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.775rem;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  color: var(--text-muted);
}

/* Badges / Chips */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.badge-violet {
  background-color: rgba(139, 92, 246, 0.1);
  color: #c084fc;
  border-color: rgba(139, 92, 246, 0.2);
}

.badge-cyan {
  background-color: rgba(6, 182, 212, 0.1);
  color: #22d3ee;
  border-color: rgba(6, 182, 212, 0.2);
}

.badge-success {
  background-color: var(--status-success-bg);
  color: var(--status-success);
  border-color: rgba(16, 185, 129, 0.2);
}

.badge-error {
  background-color: var(--status-error-bg);
  color: var(--status-error);
  border-color: rgba(239, 68, 68, 0.2);
}

/* Search and Filters */
.search-filter-bar {
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media(min-width: 768px) {
  .search-filter-bar {
    flex-direction: row;
    align-items: center;
  }
}

.search-input-wrapper {
  flex-grow: 1;
  position: relative;
}

.search-input {
  width: 100%;
  background-color: rgba(10, 15, 30, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px 0 var(--accent-primary-glow);
  background-color: rgba(10, 15, 30, 0.85);
}

.filter-select-wrapper {
  display: flex;
  gap: 0.75rem;
}

.filter-select {
  background-color: rgba(10, 15, 30, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 2rem 0.75rem 1rem;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg fill='%2394a3b8' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: all var(--transition-fast);
}

.filter-select:focus, .filter-select:hover {
  outline: none;
  border-color: var(--accent-secondary);
  color: var(--text-primary);
}

/* Detail Page Grid */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media(min-width: 992px) {
  .detail-grid {
    grid-template-columns: 280px 1fr;
  }
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.main-content {
  min-width: 0;
}

.sidebar-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
}

.sidebar-section h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.sidebar-meta-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.sidebar-meta-list li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-meta-list .label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sidebar-meta-list .value {
  color: var(--text-primary);
  font-weight: 500;
  word-break: break-all;
}

/* Code tab systems */
.code-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.code-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
  gap: 0.5rem;
}

.code-tab-btn {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.code-tab-btn:hover {
  color: var(--text-secondary);
}

.code-tab-btn.active {
  color: var(--accent-secondary);
  border-bottom-color: var(--accent-secondary);
  font-weight: 600;
}

.code-panel {
  display: none;
}

.code-panel.active {
  display: block;
}

/* Copy button */
.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.35rem 0.6rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

/* Validator Playground styling */
.validator-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media(min-width: 768px) {
  .validator-container {
    grid-template-columns: 1fr 1fr;
  }
}

.interactive-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.field label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.input-container {
  display: flex;
  gap: 0.5rem;
}

.validator-input {
  flex-grow: 1;
  background-color: rgba(10, 15, 30, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.validator-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: rgba(10, 15, 30, 0.85);
}

.validation-result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.validation-result.valid {
  background-color: var(--status-success-bg);
  border-color: rgba(16, 185, 129, 0.3);
  color: #a7f3d0;
  display: block;
}

.validation-result.invalid {
  background-color: var(--status-error-bg);
  border-color: rgba(239, 68, 68, 0.3);
  color: #fecaca;
  display: block;
}

.validation-result-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Examples list */
.example-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.example-item {
  background-color: rgba(10, 15, 30, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.example-item:hover {
  background-color: rgba(10, 15, 30, 0.7);
  border-color: var(--accent-secondary);
}

.example-item .badge {
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.example-item .value-text {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.example-item .desc-text {
  font-size: 0.825rem;
  color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Table styling for Spec page */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.spec-table th, .spec-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.spec-table th {
  background-color: rgba(255, 255, 255, 0.03);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.spec-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.01);
}

/* Tabs for Spec/LinkML structure */
.spec-classes-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.spec-class-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.spec-class-card:hover, .spec-class-card.active {
  border-color: var(--accent-secondary);
  background-color: var(--bg-surface-hover);
}

.spec-class-card h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.spec-class-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Compact View for Library Browser */
.grid.compact-view {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.grid.compact-view .card {
  padding: 1rem;
  border-radius: 8px;
}

.grid.compact-view .card-title {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.grid.compact-view .card-description {
  display: none;
}

.grid.compact-view .card-envs {
  display: none;
}

.grid.compact-view .card-footer {
  border-top: none;
  padding-top: 0.25rem;
  margin-top: auto;
}

/* Warning Banner */
.warning-banner {
  background-color: var(--status-warning-bg);
  border-bottom: 1px solid rgba(245, 158, 11, 0.25);
  padding: 0.5rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-primary);
  position: relative;
  z-index: 101;
}

.warning-banner-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.warning-icon {
  flex-shrink: 0;
  font-size: 0.95rem;
}

.warning-text {
  line-height: 1.4;
  font-weight: 400;
}

.warning-text strong {
  color: var(--status-warning);
  font-weight: 600;
}