/* ==========================================================================
   AI Supply Chain Graph — App Theme
   (UI-only styles; app logic untouched)
   ========================================================================== */

/* ---- Design tokens ------------------------------------------------------ */
:root {
  /* Brand */
  --brand-700:#0A4F96; --brand-600:#0B61B3; --brand-500:#0C6FCE; --brand-400:#2F86E6;
  --brand-300:#7BB3F2; --brand-200:#DFECFF;

  /* Surfaces & strokes */
  --bg:#F6F9FC;
  --surface:#FFFFFF;
  --surface-alt:#F8FBFF;
  --stroke:#E6EBF3;
  --stroke-strong:#D6DDE9;

  /* Text */
  --ink:#0F172A;
  --ink-muted:#5B6776;

  /* Layout & depth */
  --round:16px;
  --shadow:0 10px 30px rgba(16,75,132,.10);
  --container-max:1100px;
  --gap:20px;
  --pane-h:clamp(360px, 56vh, 820px);
}

/* ---- Reset / base ------------------------------------------------------- */
* { box-sizing:border-box; }
html, body { margin:0; padding:0; }
body {
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color: var(--ink);
  background: linear-gradient(#F7FBFF,#F3F7FC 28%, #EEF4FB);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
figure { margin:0; }

/* ---- Page shell --------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 18px auto;
  background: var(--surface);
  border-radius: var(--round);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  padding: 22px;
}

.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}


/* ---- Header ------------------------------------------------------------- */
.header {
  display:flex; justify-content:space-between; align-items:center;
  padding-bottom:6px;
}
.header h1 {
  margin:0 0 4px;
  font-weight:800; font-size:26px; letter-spacing:.2px;
  color:#0b2c60;
}
.header .back-home {
  text-decoration:none;
  font-size:.9rem;
  padding:6px 12px;
  border-radius:10px;
  border:1px solid var(--stroke);
  background:#fff; color:var(--ink);
}
.header .back-home:hover { background: var(--surface-alt); }

/* ---- Inputs & clusters -------------------------------------------------- */
.file-path-section {
  background: linear-gradient(#fff, var(--surface-alt));
  padding:14px;
  border-radius:12px;
  border:1px solid var(--stroke);
  border-left:4px solid var(--brand-500);
  margin:18px 0;
}

.input-section, .output-section { margin:20px 0 10px; }

.grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:var(--gap);
}
.span-2 { grid-column:1 / -1; }

.input-group label {
  display:block;
  font-weight:700;
  margin:0 0 6px;
  color:#0b274d;
}

input, select, textarea {
  width:100%;
  padding:10px;
  border:1px solid var(--stroke);
  border-radius:10px;
  background:#fff;
  color:var(--ink);
  transition:border-color .15s ease, box-shadow .15s ease;
}
input::placeholder { color:#98a6b6; }
input:focus, select:focus, textarea:focus {
  outline:none;
  border-color:var(--brand-500);
  box-shadow:0 0 0 3px rgba(12,111,206,.16);
}

/* Typeahead row */
.select-row {
  display:grid;
  grid-template-columns:minmax(280px,1fr) auto auto auto; /* input | Select | Run | Clear */
  gap:10px; align-items:center;
}

/* ---- Buttons ------------------------------------------------------------ */
.btn {
  cursor:pointer;
  border:none; border-radius:10px;
  color:#fff; padding:10px 14px;
  font-weight:800; letter-spacing:.2px;
  background:linear-gradient(180deg, var(--brand-500), var(--brand-600));
  box-shadow:0 8px 20px rgba(11,97,179,.18);
}
.btn:hover { filter:brightness(1.03); }

.btn.secondary,
.btn-ghost {
  background:#fff; color:var(--ink);
  border:1px solid var(--stroke);
  box-shadow:none;
}
.btn.secondary:hover,
.btn-ghost:hover { background:var(--surface-alt); }

.btn-ghost { padding:8px 12px; border-radius:10px; }

/* Focus ring (a11y) */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline:3px solid rgba(12,111,206,.22);
  outline-offset:2px;
}

/* ---- Status bar --------------------------------------------------------- */
.status {
  display:none;
  margin:14px 0 6px;
  padding:10px 12px;
  border:1px solid #cfe4ff;
  border-left:4px solid var(--brand-500);
  border-radius:8px;
  background:#eff6ff;
  color:#0b3d73;
}
.status.success { border-color:#cde9cf; background:#f0fbf2; color:#1b5e20; display:block; }
.status.error   { border-color:#ffd6d9; background:#fff5f5; color:#8b1a1a; display:block; }

/* ---- Panels ------------------------------------------------------------- */
.panel {
  background:var(--surface);
  border:1px solid var(--stroke);
  border-radius:var(--round);
  box-shadow:var(--shadow);
  overflow:hidden;
  display:flex; flex-direction:column;
}
.panel__header {
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 16px;
  background:linear-gradient(#fff, #f7fbff);
  border-bottom:1px solid var(--stroke);
}
.panel__title {
  margin:0; font-size:16px; font-weight:800; letter-spacing:.2px; color:#0b274d;
}
.panel__tools { display:inline-flex; gap:8px; }
.panel__caption {
  padding:10px 14px 14px;
  border-top:1px solid var(--stroke);
  color:var(--ink-muted);
  font-size:12.5px; line-height:1.45;
}

/* ---- Visualization surface --------------------------------------------- */
#graphviz-container { height:var(--pane-h); position:relative; overflow:auto; }
.viz-surface {
  height:var(--pane-h);
  position:relative;
  padding:10px;
  border:1px solid var(--stroke);
  border-radius:var(--round);
  background:
    radial-gradient(circle at 1px 1px, rgba(0,0,0,.032) 1px, transparent 1px) 0 0 / 16px 16px,
    #fff;
}
.viz-surface svg { max-width:100%; height:auto; }

/* Placeholder */
.placeholder {
  text-align:center;
  padding:52px;
  color:#667085;
  font-size:14px;
}

/* ---- DOT output area ---------------------------------------------------- */
.codewrap { display:grid; }
.code-surface,
.dot-textarea {
  height:var(--pane-h);
  resize:vertical;
  border-radius:0 0 var(--round) var(--round);
  border:1px solid var(--stroke);
  background:
    linear-gradient(#fff, #fff) padding-box,
    repeating-linear-gradient(
      to bottom,
      rgba(12,111,206,.08),
      rgba(12,111,206,.08) 28px,
      transparent 28px,
      transparent 56px
    ) border-box;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Courier New", monospace;
  font-size:12.5px; line-height:1.4;
  color:#0b1220;
  padding:12px 14px;
  tab-size:2;
  white-space:pre;
  overflow:auto;
}

/* ---- Make the two output panels equal height --------------------------- */
.output-section .grid {
  /* switch this row to flex for equal-height columns */
  display:flex;
  gap:var(--gap);
  align-items:stretch;
}
/* .output-section .panel {
  flex:1;
  display:flex;
  flex-direction:column;
} */

/* Adjust split: Visualization wider, DOT Output narrower */
.output-section .panel:first-child {  /* Visualization */
  flex: 0 1 53%;
  display: flex;
  flex-direction: column;
}

.output-section .panel:last-child {   /* DOT Format Output */
  flex: 0 1 47%;
  display: flex;
  flex-direction: column;
}

.output-section .viz-surface,
.output-section .codewrap {
  flex:1;                /* grow to fill panel */
  min-height:420px;      /* shared minimum height */
}
.output-section .codewrap textarea {
  height:100%;
  width:100%;
  box-sizing:border-box;
  resize:vertical;       /* keep user resize, or set to 'none' */
}

/* ---- Utilities ---------------------------------------------------------- */
.hidden-ui { display:none !important; }  /* used to hide Graph File Path (UI only) */
.helper-note { margin:8px 0 0; font-size:13px; color:var(--ink-muted); }
.hint { color:#758297; font-size:12px; }

/* Edge/type labels (SVG) */
.edge-label, .type-label {
  font:10px/1.2 Arial,sans-serif;
  fill:#333; paint-order:stroke; stroke:#fff; stroke-width:3px;
}
.type-label { font-size:9px; }

/* Subtle scrollbars */
.code-surface::-webkit-scrollbar,
.viz-surface::-webkit-scrollbar { height:12px; width:12px; }
.code-surface::-webkit-scrollbar-thumb,
.viz-surface::-webkit-scrollbar-thumb {
  background:#cfd6e3; border-radius:8px; border:3px solid transparent; background-clip:content-box;
}
.code-surface::-webkit-scrollbar-track,
.viz-surface::-webkit-scrollbar-track { background:transparent; }

/* ---- Footer ------------------------------------------------------------- */
.site-footer {
  max-width:var(--container-max);
  margin:10px auto 28px;
  text-align:center;
  color:#6a7a90;
  font-size:13px;
}

/* ---- Legend injected by JS --------------------------------------------- */
.legend-footer {
  position:absolute; top:8px; left:8px;
  display:flex; gap:10px; align-items:center;
  background:rgba(255,255,255,.92);
  border:1px solid #ddd; border-radius:12px;
  padding:10px 12px; box-shadow:0 6px 18px rgba(0,0,0,.06);
  font:12px/1.3 system-ui, Arial, sans-serif;
  pointer-events:auto;
  backdrop-filter: blur(6px);
}
.legend-footer .legend-chip {
  display:inline-flex; align-items:center; justify-content:center;
  padding:4px 10px; border:1px solid #d8dbe2; border-radius:999px;
  font-weight:700; background:#fff;
}

/* ---- Responsive --------------------------------------------------------- */
@media (max-width:900px) {
  .grid { grid-template-columns:1fr; }
  .output-section .grid { flex-direction:column; } /* stack panels on small screens */
}
@media (max-width:800px) {
  .select-row { grid-template-columns:1fr; }
  .select-row > button { width:100%; }
}