/* Diagram Studio. Tokens first, then components. Light is the default; dark follows the OS or an explicit choice. */
:root {
  --bg: #F3F2EC;
  --surface: #FFFFFF;
  --surface-2: #F8F7F3;
  --ink: #17201E;
  --muted: #5B6764;
  --rule: #DAD7CC;
  --accent: #0E5A57;
  --accent-ink: #FFFFFF;
  --accent-soft: #E1EEEB;
  --danger: #A63A2B;
  --shadow: 0 1px 2px rgba(20, 30, 28, .06), 0 8px 24px rgba(20, 30, 28, .05);
  --radius: 14px;
  --font: "IBM Plex Sans Arabic", "Segoe UI", Tahoma, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101412;
    --surface: #171D1B;
    --surface-2: #1D2523;
    --ink: #E7ECEA;
    --muted: #9AA6A2;
    --rule: #2C3634;
    --accent: #6FC2BC;
    --accent-ink: #0E1513;
    --accent-soft: #1B3634;
    --danger: #F08A7A;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #101412; --surface: #171D1B; --surface-2: #1D2523; --ink: #E7ECEA; --muted: #9AA6A2;
  --rule: #2C3634; --accent: #6FC2BC; --accent-ink: #0E1513; --accent-soft: #1B3634;
  --danger: #F08A7A; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 400 15px/1.7 var(--font);
  min-height: 100vh;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-top: 20px;
  padding-bottom: 32px;
}
h1, h2, h3 { margin: 0; line-height: 1.3; text-wrap: balance; }
h1 { font-size: 22px; font-weight: 700; letter-spacing: -.01em; }
h2 { font-size: 17px; font-weight: 600; }
p { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.app { max-width: 1240px; margin: 0 auto; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.brand { display: flex; align-items: center; gap: 12px; }
.mark {
  width: 38px; height: 38px; border-radius: 10px; flex: none;
  background: var(--accent);
  background-image: linear-gradient(135deg, transparent 46%, var(--accent-ink) 46% 54%, transparent 54%);
  opacity: .95;
}
.sub { color: var(--muted); font-size: 13px; margin-top: 2px; }
.pill {
  font-size: 12.5px; padding: 5px 12px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--rule); color: var(--muted);
}
.pill.ok { color: var(--accent); border-color: var(--accent); }
.pill.warn { color: var(--danger); border-color: var(--danger); }

.layout { display: grid; gap: 20px; grid-template-columns: minmax(0, 1fr); align-items: start; }
@media (min-width: 980px) {
  .layout { grid-template-columns: minmax(380px, 450px) minmax(0, 1fr); }
  .input-card { position: sticky; top: 20px; }
}
.card {
  background: var(--surface); border: 1px solid var(--rule);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; min-width: 0;
}
.card > h2, .card > .history-head h2 { margin-bottom: 14px; }
.muted { color: var(--muted); font-size: 14px; }
.row-end { display: flex; justify-content: flex-end; min-height: 26px; margin-top: 6px; }
.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin: 14px 0 6px; }

.drop {
  display: grid; gap: 4px; justify-items: center; text-align: center;
  padding: 26px 16px; border-radius: 12px; cursor: pointer;
  border: 1.5px dashed var(--rule); background: var(--surface-2);
  transition: border-color .2s, background .2s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop-title { font-weight: 600; }
.drop-hint { font-size: 12.5px; color: var(--muted); }
.file-name { font-size: 13px; color: var(--accent); font-family: var(--mono); direction: ltr; word-break: break-all; }

textarea, input[type="text"], select {
  width: 100%; background: var(--surface-2); border: 1px solid var(--rule);
  border-radius: 10px; padding: 10px 12px; min-width: 0;
}
textarea { resize: vertical; min-height: 160px; line-height: 1.8; }
.grid2 { display: grid; gap: 4px 14px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 520px) { .grid2 { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

button { cursor: pointer; border-radius: 10px; }
button.primary {
  width: 100%; margin-top: 18px; padding: 12px 16px; border: 0;
  background: var(--accent); color: var(--accent-ink); font-weight: 600; font-size: 15px;
}
button.primary:hover { filter: brightness(1.05); }
button.primary:disabled { opacity: .55; cursor: progress; }
button.ghost {
  padding: 7px 12px; font-size: 13px; background: transparent;
  border: 1px solid var(--rule); color: var(--ink);
}
button.ghost:hover { border-color: var(--accent); color: var(--accent); }
button.link { background: none; border: 0; padding: 4px 2px; color: var(--accent); font-size: 13px; }
.error { margin-top: 12px; padding: 10px 12px; border-radius: 10px; color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); font-size: 14px; }

.progress { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--rule); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.steps li { position: relative; padding-inline-start: 26px; color: var(--muted); font-size: 14px; }
.steps li::before {
  content: ""; position: absolute; inset-inline-start: 0; top: 7px; width: 12px; height: 12px;
  border-radius: 50%; border: 2px solid var(--rule); background: var(--surface);
}
.steps li.active { color: var(--ink); font-weight: 600; }
.steps li.active::before { border-color: var(--accent); background: var(--accent); animation: pulse 1.2s ease-in-out infinite; }
.steps li.done { color: var(--accent); }
.steps li.done::before { border-color: var(--accent); background: var(--accent); }
.steps li.failed { color: var(--danger); }
@keyframes pulse { 50% { opacity: .35; } }
@media (prefers-reduced-motion: reduce) { .steps li.active::before { animation: none; } }

.result-col { display: grid; gap: 20px; min-width: 0; }
.empty { text-align: center; padding: 48px 20px; border-style: dashed; box-shadow: none; background: transparent; }
.empty-title { font-weight: 600; font-size: 16px; margin-bottom: 6px; }
.result-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.result-head h2 { font-size: 20px; text-wrap: balance; }
.toolbar { display: flex; gap: 6px; flex-wrap: wrap; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--rule); margin-bottom: 16px; overflow-x: auto; }
.tab {
  background: none; border: 0; padding: 10px 14px; color: var(--muted); font-weight: 500;
  border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap;
}
.tab[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.canvas-wrap {
  overflow: auto; border-radius: 12px; border: 1px solid var(--rule);
  background-color: var(--surface-2);
  background-image: radial-gradient(color-mix(in srgb, var(--rule) 70%, transparent) 1px, transparent 1px);
  background-size: 18px 18px; padding: 18px; min-height: 280px;
}
.canvas { zoom: 1; min-width: 0; }
.canvas svg { display: block; max-width: none; height: auto; min-width: 560px; }
.canvas svg .node rect, .canvas svg .mindmap-node rect, .canvas svg rect.label-container { rx: 10; }
.fig-cap { margin-top: 12px; font-size: 13px; color: var(--muted); text-align: center; direction: ltr; unicode-bidi: plaintext; }
.err { color: var(--danger); }

.explain { font-size: 15px; max-width: 72ch; }
.explain h3 { font-size: 15px; color: var(--accent); margin: 22px 0 6px; }
.explain h3:first-child { margin-top: 0; }
.explain p { margin-bottom: 8px; }
.explain .ar { direction: rtl; text-align: right; color: var(--ink); opacity: .92; }
.explain ul, .explain ol { padding-inline-start: 22px; margin: 4px 0 8px; }
.explain li { margin: 3px 0; }
.explain .lead { font-size: 16px; }
.explain .tag { font-size: 12px; color: var(--muted); margin-bottom: 2px; }
.terms table { width: 100%; border-collapse: collapse; font-size: 14px; }
.terms th, .terms td { text-align: start; vertical-align: top; padding: 9px 8px; border-bottom: 1px solid var(--rule); }
.terms th { font-size: 12px; color: var(--muted); font-weight: 600; }
.terms .ar { display: block; direction: rtl; text-align: right; color: var(--muted); font-size: 13.5px; }
.terms-scroll { overflow-x: auto; }

.history-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.history-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.hist-item { display: flex; align-items: center; gap: 8px; }
.hist {
  flex: 1; min-width: 0; text-align: start; display: grid; gap: 2px; padding: 10px 12px;
  background: var(--surface-2); border: 1px solid var(--rule); border-radius: 10px;
}
.hist span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; font-size: 14px; }
.hist small { color: var(--muted); font-size: 12px; }
.hist:hover { border-color: var(--accent); }
.del { padding: 6px 9px; font-size: 13px; background: transparent; border: 1px solid var(--rule); color: var(--muted); }
.del:hover { color: var(--danger); border-color: var(--danger); }

.foot { margin-top: 28px; font-size: 12.5px; color: var(--muted); text-align: center; }