/* ============================================================
   OpenFF Roadmap — Design System
   ============================================================ */

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

/* ---- Custom Properties — Dark (default) ------------------ */
:root {
  --color-bg:           #0f1117;
  --color-surface:      #1a1d27;
  --color-surface-2:    #222636;
  --color-border:       #2d3148;
  --color-border-light: #3d4260;
  --color-text:         #e2e8f0;
  --color-text-muted:   #8892a4;
  --color-text-faint:   #4a5568;
  --color-accent:       #6366f1;
  --color-accent-hover: #818cf8;

  /* Category colors — must match projects.js */
  --cat-infrastructure: #6366f1;
  --cat-domain:         #10b981;
  --cat-accuracy:       #f59e0b;
  --cat-benchmarking:   #3b82f6;
  --cat-usability:      #ec4899;

  /* Maturity colors */
  --mat-early: #f97316;
  --mat-mid:   #eab308;
  --mat-late:  #22c55e;
  --mat-end:   #94a3b8;
  --mat-full:  #a78bfa;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);

  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  --max-width: 1400px;
  --nav-height: 60px;

  /* Graph node text (SVG fill fallback via CSS variable) */
  --graph-node-text: #e2e8f0;
}

/* ---- Light mode ------------------------------------------ */
[data-theme="light"] {
  --color-bg:           #f8f9fc;
  --color-surface:      #ffffff;
  --color-surface-2:    #f1f3f8;
  --color-border:       #dde1ee;
  --color-border-light: #c8cee0;
  --color-text:         #1a1d2e;
  --color-text-muted:   #5a6378;
  --color-text-faint:   #9ba3b8;
  --color-accent:       #5254cc;
  --color-accent-hover: #4547b0;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --graph-node-text: #1a1d2e;
}

/* ---- Theme toggle button --------------------------------- */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  white-space: nowrap;
  margin-left: auto;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--color-border-light);
  color: var(--color-text);
}

.theme-toggle .toggle-icon { font-size: 0.9rem; line-height: 1; }

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 15px;
}

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

h1, h2, h3, h4 { font-weight: 600; line-height: 1.3; }
h1 { font-size: 2rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

p { margin-bottom: 0.75rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.4rem; }
li { margin-bottom: 0.25rem; }

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface-2);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
}

/* ---- Layout ---------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-content {
  padding: 2rem 0 4rem;
}

/* ---- Navigation ------------------------------------------ */
.site-nav {
  height: var(--nav-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.site-nav .container {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-logo span {
  color: var(--color-accent-hover);
}

.nav-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

.nav-breadcrumb a {
  color: var(--color-text-muted);
}

.nav-breadcrumb a:hover { color: var(--color-text); }

.nav-breadcrumb .sep { color: var(--color-text-faint); }

.nav-breadcrumb .current { color: var(--color-text); font-weight: 500; }

.nav-home-link {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  white-space: nowrap;
}

/* ---- Badges ---------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.badge--cat-infrastructure { background: rgba(99,102,241,0.15); color: #a5b4fc; border: 1px solid rgba(99,102,241,0.3); }
.badge--cat-domain          { background: rgba(16,185,129,0.15); color: #6ee7b7; border: 1px solid rgba(16,185,129,0.3); }
.badge--cat-accuracy        { background: rgba(245,158,11,0.15); color: #fcd34d; border: 1px solid rgba(245,158,11,0.3); }
.badge--cat-benchmarking    { background: rgba(59,130,246,0.15); color: #93c5fd; border: 1px solid rgba(59,130,246,0.3); }
.badge--cat-usability       { background: rgba(236,72,153,0.15); color: #f9a8d4; border: 1px solid rgba(236,72,153,0.3); }

.badge--mat-early { background: rgba(249,115,22,0.15); color: #fdba74; border: 1px solid rgba(249,115,22,0.3); }
.badge--mat-mid   { background: rgba(234,179,8,0.15);  color: #fde047; border: 1px solid rgba(234,179,8,0.3); }
.badge--mat-late  { background: rgba(34,197,94,0.15);  color: #86efac; border: 1px solid rgba(34,197,94,0.3); }
.badge--mat-end   { background: rgba(148,163,184,0.15);color: #cbd5e1; border: 1px solid rgba(148,163,184,0.3); }
.badge--mat-full  { background: rgba(167,139,250,0.15);color: #c4b5fd; border: 1px solid rgba(167,139,250,0.3); }

.badge--alt {
  background: rgba(148,163,184,0.1);
  color: #94a3b8;
  border: 1px solid rgba(148,163,184,0.25);
  font-style: italic;
}

.badge--recommended {
  background: rgba(34,197,94,0.1);
  color: #86efac;
  border: 1px solid rgba(34,197,94,0.25);
}

/* ---- Cards ----------------------------------------------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-md);
}

.card-link {
  display: block;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.card-link:hover { text-decoration: none; }

/* ---- Section headers ------------------------------------- */
.section-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.section-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section-icon {
  width: 18px;
  height: 18px;
  color: var(--color-text-faint);
  flex-shrink: 0;
}

/* ---- Utility classes ------------------------------------- */
.text-muted  { color: var(--color-text-muted); }
.text-faint  { color: var(--color-text-faint); }
.text-sm     { font-size: 0.875rem; }
.text-xs     { font-size: 0.75rem; }
.font-mono   { font-family: var(--font-mono); }
.font-medium { font-weight: 500; }
.font-bold   { font-weight: 700; }

.flex        { display: flex; }
.flex-wrap   { flex-wrap: wrap; }
.items-center { align-items: center; }
.gap-1       { gap: 0.25rem; }
.gap-2       { gap: 0.5rem; }
.gap-3       { gap: 0.75rem; }
.gap-4       { gap: 1rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }

/* ---- Responsive ------------------------------------------ */
@media (max-width: 768px) {
  h1 { font-size: 1.5rem; }
  .container { padding: 0 1rem; }
}

/* ---- Light mode graph & component overrides -------------- */
[data-theme="light"] .graph-wrapper {
  background: #ffffff;
}

[data-theme="light"] .graph-legend {
  background: var(--color-surface-2);
}

[data-theme="light"] .graph-tooltip {
  background: #ffffff;
}

[data-theme="light"] .fte-section {
  background: var(--color-surface);
}

[data-theme="light"] .metrics-list li,
[data-theme="light"] .gonogo-gate,
[data-theme="light"] .dep-card,
[data-theme="light"] .project-nav-link {
  background: var(--color-surface);
}

[data-theme="light"] .card {
  background: var(--color-surface);
}

/* Zoom buttons */
[data-theme="light"] .zoom-btn {
  background: var(--color-surface-2);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

[data-theme="light"] .zoom-btn:hover {
  background: var(--color-border);
  color: var(--color-text);
}