/* ============================================================
   GSWESTOK IT — design tokens
   A trail-map for the network: waypoints, not menus.
   ============================================================ */

:root {
  /* Ink & paper */
  --ink: #1c2321;
  --ink-soft: #4b5563;
  --paper: #f6f5f1;
  --panel: #ffffff;
  --line: #e2e0d8;

  /* Waypoint colors (carried over from the source flowchart) */
  --start-stroke: #818cf8;
  --start-fill: #eef2ff;
  --option-stroke: #14b8a6;
  --option-fill: #f0fdfa;
  --child-stroke: #fb923c;
  --child-fill: #fff7ed;
  --leaf-stroke: #22c55e;
  --leaf-fill: #f0fdf4;

  --accent: #0f766e;
  --accent-soft: #ccfbf1;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(28, 35, 33, 0.06);
  --shadow-md: 0 8px 24px rgba(28, 35, 33, 0.10);
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ---------- Header ---------- */

.site-header {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.1rem 1.75rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.site-header img.mark {
  width: 34px;
  height: 34px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.site-header h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  margin: 0;
}

.site-header .subtitle {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 0;
}

.site-header nav {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
}

.site-header nav a,
.site-header nav button {
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.site-header nav a:hover,
.site-header nav a.active,
.site-header nav button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.site-header nav button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: var(--line);
  background: var(--panel);
}

/* Hamburger toggle — hidden on desktop, shown in its place on mobile */
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
  padding: 0;
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.nav-toggle-icon { position: relative; }
.nav-toggle-icon::before,
.nav-toggle-icon::after { content: ""; position: absolute; left: 0; }
.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 640px) {
  .site-header { padding: 0.75rem 1rem; }
  .site-header .subtitle { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-header nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 1rem 1rem;
    display: none;
    z-index: 60;
  }
  .site-header nav.open { display: flex; }
  .site-header nav a,
  .site-header nav button {
    width: 100%;
    text-align: left;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    font-size: 0.95rem;
  }
}

/* ---------- Diagram stage ---------- */

.stage {
  max-width: 1200px;
  margin: 1.25rem auto 3rem;
  padding: 1.5rem;
}

.diagram-frame {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 2rem 1.5rem;
  overflow-x: auto;
}

.diagram-frame svg { max-width: 100%; height: auto; }

/* Mermaid measures/sizes its HTML node labels (foreignObject content)
   itself, in its own box model. The site-wide `* { box-sizing: border-box }`
   above leaks into that measurement and can make labels clip inside their
   box — most noticeable on the smaller boxes / narrower viewport on mobile.
   Excluding Mermaid's own label markup keeps its sizing math intact. */
.diagram-frame foreignObject,
.diagram-frame foreignObject * {
  box-sizing: content-box;
}

/* Full-window diagram view (index.html) */

.nav-body {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.stage-full {
  flex: 1;
  min-height: 0;
  margin: 0;
  max-width: none;
  padding: 0.75rem;
  display: flex;
}

.diagram-frame-full {
  position: relative;
  flex: 1;
  min-height: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  overflow: hidden; /* clips panned/zoomed content instead of scrolling it */
  touch-action: none; /* hand pinch/pan/tap gestures entirely to our JS */
}

.diagram-frame-full #diagram {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-origin: center center;
  will-change: transform;
}

.diagram-frame-full svg {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
}

@media (max-width: 640px) {
  .stage-full { padding: 0.4rem; }
  .diagram-frame-full { padding: 0.4rem; border-radius: 8px; }
}

.hint {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
  padding: 1rem;
}

.empty-state {
  display: none;
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  color: var(--ink-soft);
  text-align: center;
  padding: 2rem;
}
.empty-state.is-visible { display: flex; }

/* ---------- Upload control (site nav) ---------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.diagram-frame .node rect,
.diagram-frame .node polygon,
.diagram-frame .node circle {
  cursor: pointer;
  transition: filter 0.15s ease;
}
.diagram-frame .node:hover rect,
.diagram-frame .node:hover polygon,
.diagram-frame .node:hover circle {
  filter: brightness(0.96) saturate(1.2);
}

/* ---------- Modal ---------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(28, 35, 33, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 100;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--panel);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  box-shadow: var(--shadow-md);
  padding: 1.75rem 1.9rem;
  max-height: 85vh;
  overflow-y: auto;
}

.modal h2 {
  font-family: var(--font-display);
  margin-top: 0;
  font-size: 1.35rem;
}

.modal p { line-height: 1.6; color: var(--ink-soft); }
.modal code {
  font-family: var(--font-mono);
  background: var(--start-fill);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.85em;
}
.modal pre {
  background: var(--ink);
  color: #e6f7f4;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
}

.modal .modal-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.25rem;
}

/* Modal that's just an infographic image (Learn about Mermaid) */

.modal.modal-image {
  max-width: 96vw;
  width: fit-content;
  padding: 1rem;
}
.modal-image picture,
.modal-image img {
  display: block;
  max-width: 100%;
  max-height: 84vh;
  width: auto;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
}
.modal-image .modal-actions { margin-top: 0.9rem; padding: 0 0.15rem; }

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover { background: #0d6259; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }