/* ============================================
   FCA4J Documentation — Style Sheet
   Modern, clean design for academic software
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-bg: #ffffff;
  --color-bg-subtle: #f8f9fa;
  --color-bg-sidebar: #1a1d23;
  --color-bg-sidebar-hover: #262a33;
  --color-text: #2c3e50;
  --color-text-secondary: #5a6977;
  --color-text-sidebar: #b0b8c4;
  --color-text-sidebar-heading: #8892a0;
  --color-text-sidebar-active: #ffffff;
  --color-accent: #3b82f6;
  --color-accent-light: #dbeafe;
  --color-accent-dark: #1d4ed8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-code-bg: #f1f5f9;
  --color-code-text: #1e293b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-badge-fca: #8b5cf6;
  --color-badge-fca-bg: #ede9fe;
  --color-badge-rca: #06b6d4;
  --color-badge-rca-bg: #cffafe;
  --color-badge-data: #f97316;
  --color-badge-data-bg: #fff7ed;
  --sidebar-width: 280px;
  --content-max-width: 860px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', Consolas, monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

/* --- Layout --- */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* --- Top Bar (mobile) --- */
.top-bar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--color-bg-sidebar);
  color: #fff;
  align-items: center;
  padding: 0 16px;
  z-index: 100;
  gap: 12px;
}

.top-bar-title {
  font-weight: 700;
  font-size: 1.125rem;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.top-bar-logo {
  width: 24px;
  height: 24px;
  max-width: 24px;
  max-height: 24px;
  border-radius: 4px;
  display: block;
}

.top-bar-version {
  font-size: 0.75rem;
  color: var(--color-text-sidebar-heading);
  background: var(--color-bg-sidebar-hover);
  padding: 2px 8px;
  border-radius: 10px;
}

.menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 4px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-bg-sidebar);
  overflow-y: auto;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 24px 20px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.logo-img {
  width: 28px;
  height: 28px;
  max-width: 28px;
  max-height: 28px;
  border-radius: 6px;
  display: block;
}

.logo-text {
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  letter-spacing: -0.03em;
}

.sidebar-version {
  font-size: 0.7rem;
  color: var(--color-text-sidebar-heading);
  background: rgba(255,255,255,0.08);
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}

/* --- Sidebar Navigation --- */
.sidebar-nav {
  flex: 1;
  padding: 12px 0;
}

.nav-section {
  padding: 4px 0 12px;
}

.nav-section + .nav-section {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 12px;
}

.nav-heading {
  display: block;
  padding: 8px 20px 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-sidebar-heading);
}

.nav-subheading {
  display: block;
  padding: 10px 20px 2px;
  font-size: 0.675rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.25);
}

.nav-link {
  display: block;
  padding: 6px 20px;
  font-size: 0.875rem;
  color: var(--color-text-sidebar);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
}

.nav-link:hover {
  background: var(--color-bg-sidebar-hover);
  color: #fff;
}

.nav-link.active {
  color: var(--color-text-sidebar-active);
  background: var(--color-bg-sidebar-hover);
  border-left-color: var(--color-accent);
  font-weight: 500;
}

.nav-link.nav-indent {
  padding-left: 32px;
  font-size: 0.8125rem;
}

.nav-tools {
  margin-top: auto;
}

/* --- Nav Backdrop (mobile) --- */
.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 40;
}

/* --- Main Content --- */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.content-inner {
  flex: 1;
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
  padding: 48px 40px;
}

/* --- Typography --- */
h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--color-text);
}

h2 {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-top: 40px;
  margin-bottom: 12px;
  color: var(--color-text);
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 28px;
  margin-bottom: 8px;
}

p {
  margin-bottom: 16px;
  line-height: 1.7;
}

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

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 2px 6px;
  border-radius: 4px;
}

pre {
  margin-bottom: 20px;
  overflow-x: auto;
}

pre code {
  display: block;
  padding: 16px 20px;
  background: var(--color-code-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: 0.8125rem;
  line-height: 1.6;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 0.9375rem;
}

thead th {
  text-align: left;
  padding: 10px 16px;
  background: var(--color-bg-subtle);
  border-bottom: 2px solid var(--color-border);
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

tbody td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: top;
}

tbody tr:hover {
  background: var(--color-bg-subtle);
}

/* --- Command Page --- */
.command-page {}

.command-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.command-header h1 {
  font-size: 2.25rem;
  margin-bottom: 12px;
}

.command-description {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 640px;
}

.command-category-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Category badge colors */
.command-category-badge {
  background: var(--color-badge-fca-bg);
  color: var(--color-badge-fca);
}

/* Override based on text content via JS or just use one color for simplicity */

.command-section {
  margin-bottom: 36px;
}

.command-section h2 {
  margin-top: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.command-usage {
  margin-bottom: 0;
}

.command-usage code {
  background: var(--color-bg-sidebar);
  color: #e2e8f0;
  border: none;
}

/* --- Options Table --- */
.options-table {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.options-table thead th:first-child {
  width: 240px;
}

.opt-key code {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
  font-weight: 500;
  white-space: nowrap;
}

.option-values {
  list-style: none;
  padding: 4px 0;
  margin: 4px 0 0;
}

.option-values li {
  padding: 2px 0;
}

.option-values li code {
  font-weight: 500;
}

/* --- Examples --- */
.example-block {
  margin-bottom: 20px;
}

.example-explanation {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
  padding-left: 12px;
  border-left: 3px solid var(--color-border);
}

/* --- Commands Overview Page --- */
.commands-overview h1 {
  margin-bottom: 8px;
}

.commands-overview > p {
  color: var(--color-text-secondary);
  margin-bottom: 36px;
}

.command-group {
  margin-bottom: 40px;
}

.command-group h2 {
  margin-top: 0;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.command-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.command-card {
  display: block;
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.command-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.command-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.command-card p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Index Page --- */
.index-page h1 {
  margin-bottom: 32px;
}

.index-letter-group {
  margin-bottom: 28px;
}

.index-letter-group h2 {
  margin-top: 0;
  font-size: 1.5rem;
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent-light);
  padding-bottom: 4px;
  margin-bottom: 12px;
}

.index-entry {
  padding: 4px 0;
  font-size: 0.9375rem;
}

.index-term {
  font-weight: 500;
}

/* --- Search Page --- */
.search-page h1 {
  margin-bottom: 24px;
}

.search-box {
  margin-bottom: 32px;
}

#search-input {
  width: 100%;
  max-width: 480px;
  padding: 12px 16px;
  font-size: 1rem;
  font-family: var(--font-sans);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.search-result-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.search-result-item a {
  font-size: 1.0625rem;
  font-weight: 600;
}

.search-result-item .result-category {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-left: 8px;
}

.search-result-item .result-excerpt {
  margin-top: 4px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.search-no-results {
  color: var(--color-text-secondary);
  font-style: italic;
}

/* --- Getting Started Page --- */
.getting-started h2 {
  margin-top: 48px;
}

.step-block {
  margin-bottom: 28px;
  padding-left: 20px;
  border-left: 3px solid var(--color-accent-light);
}

.step-block h3 {
  margin-top: 0;
  color: var(--color-accent-dark);
}

/* --- Downloads Page --- */
.downloads-table {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.downloads-table td a {
  font-weight: 500;
}

/* --- Introduction Page --- */
.intro-hero {
  text-align: center;
  padding: 40px 0 48px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.intro-logo {
  width: 96px;
  height: 96px;
  max-width: 96px;
  max-height: 96px;
  margin: 0 auto 16px;
  border-radius: 20px;
  display: block;
}

.intro-hero h1 {
  font-size: 2.75rem;
  letter-spacing: -0.04em;
  margin-bottom: 12px;
}

.intro-hero .subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
}

.intro-quickstart {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.intro-quickstart h2 {
  margin-top: 0;
}

.intro-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.feature-card {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 6px;
  font-size: 1rem;
}

.feature-card p {
  margin-bottom: 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* --- Footer --- */
.site-footer {
  padding: 24px 40px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.site-footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

.footer-meta {
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--color-border);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .top-bar {
    display: flex;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  body.nav-open .nav-backdrop {
    display: block;
  }

  .content {
    margin-left: 0;
    padding-top: 56px;
  }

  .content-inner {
    padding: 24px 20px;
  }

  .site-footer {
    padding: 20px;
  }

  .command-header h1 {
    font-size: 1.75rem;
  }

  .intro-hero h1 {
    font-size: 2rem;
  }

  .options-table thead th:first-child {
    width: auto;
  }

  .command-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .content-inner {
    padding: 20px 16px;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }

  .options-table {
    font-size: 0.8125rem;
  }

  .options-table td, .options-table th {
    padding: 8px 10px;
  }
}