:root {
  --black: #111;
  --dark: #252525;
  --mid: #6c6c6c;
  --line: #cfcfcf;
  --soft: #f1f1f1;
  --paper: #fff;
  --accent: #3f6fff;
  --accent-soft: #eaf0ff;
  --danger: #8b1e1e;
  --radius: 2px;
  --max: 1500px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--paper);
  color: var(--black);
  line-height: 1.45;
}
button, input, textarea, select { font: inherit; }
button { color: inherit; cursor: pointer; }

.site-header {
  border-bottom: 2px solid var(--black);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  padding: 26px 34px 22px;
}
.header-copy { min-width: 0; }
.brand-block h1 {
  margin: 4px 0 0;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.header-subtitle { margin: 6px 0 0; color: var(--mid); }
.eyebrow,
.session-label,
.section-kicker {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--mid);
  font-weight: 700;
}
.header-actions,
.session-tools {
  display: flex;
  gap: 7px;
  align-items: center;
  flex-wrap: wrap;
}
.button,
.text-button,
.icon-button {
  border: 1px solid var(--black);
  background: var(--paper);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}
.button { padding: 9px 13px; font-weight: 700; }
.button:hover,
.text-button:hover,
.icon-button:hover { border-color: var(--accent); color: var(--accent); }
.button-secondary { border-color: var(--line); }
.button-primary { background: var(--black); color: #fff; }
.button-primary:hover { background: #333; color: #fff; border-color: #333; }
.text-button { border: 0; padding: 4px 6px; text-decoration: underline; text-underline-offset: 2px; }
.icon-button { width: 34px; height: 34px; font-size: 1.25rem; line-height: 1; }

.app-shell { max-width: var(--max); margin: 0 auto; padding: 0 26px 36px; }
.session-bar {
  margin: 18px 0 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  background: #fafafa;
}
.session-bar strong { display: block; margin-top: 2px; font-size: 1rem; }
.session-name {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  font: inherit;
  font-weight: 700;
  color: inherit;
  cursor: pointer;
  text-align: left;
}
.session-name:hover { text-decoration: underline; }
.save-status { color: var(--mid); font-size: .8rem; white-space: nowrap; }
.save-status.saved { color: #2e6a3e; }
.save-status.unsaved { color: #7b4b00; }

.workspace { margin-top: 12px; }
.section { border-bottom: 1px solid var(--black); }
.section summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 16px;
  padding: 17px 4px;
  font-weight: 700;
  font-size: 14px;
}
.section summary::-webkit-details-marker { display: none; }
.section summary:before { content: "+"; font-weight: 500; width: 20px; }
.section[open] summary:before { content: "−"; }
.section-title { display: flex; align-items: baseline; gap: 10px; min-width: 0; flex: 1; }
.section-title span:last-child { font-weight: 700; }
.section-summary { color: var(--mid); font-weight: 500; font-size: 13px; }
.section-focus {
  border: 1px solid var(--line);
  background: transparent;
  padding: 5px 9px;
  font-size: 11px;
  cursor: pointer;
  flex: 0 0 auto;
}
.section-focus:hover { border-color: var(--accent); color: var(--accent); }
.section-content { padding: 0 0 26px; }
.section[open] summary { background: var(--soft); color: var(--black); padding-left: 8px; }
.section[open] .section-content { padding: 8px; }

.intro-grid, .setup-grid, .help-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 22px; }
.copy p { margin: 0 0 12px; }
.copy ul { margin: 8px 0 16px 20px; padding: 0; }
.copy li { margin: 4px 0; }
.callout { background: var(--soft); border-left: 4px solid var(--black); padding: 16px; }
.callout h3 { margin: 0 0 8px; font-size: .95rem; }
.help-link { background: none; border: 0; text-decoration: underline; text-underline-offset: 2px; cursor: pointer; padding: 0; }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 15px 0; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 11px; font-weight: 700; }
input[type="text"], textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: var(--radius);
  padding: 9px 10px;
  outline: none;
}
input[type="text"]:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
textarea { min-height: 90px; resize: vertical; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); }
.obs-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.obs-table th, .obs-table td { border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); vertical-align: top; }
.obs-table th:last-child, .obs-table td:last-child { border-right: 0; }
.obs-table tr:last-child td { border-bottom: 0; }
.obs-table th { background: var(--soft); text-align: left; padding: 10px; font-size: 11px; }
.obs-table td { padding: 10px; }
.obs-cell { min-height: 30px; white-space: pre-wrap; }
.obs-row-actions { width: 86px; text-align: center; }
.row-actions { display: flex; gap: 5px; }
.small-button {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 2px;
  cursor: pointer;
  font-size: 11px;
  padding: 4px 7px;
}
.small-button:hover { border-color: var(--accent); color: var(--accent); }
.small-button.danger:hover { border-color: var(--danger); color: var(--danger); }

.section-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 14px 0; }
.hint { color: var(--mid); font-size: .8rem; }

.map-intro { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 16px; }
.map-actions { display: flex; gap: 7px; flex-wrap: wrap; }
.map-board {
  position: relative;
  border: 1px solid var(--line);
  background: #fcfcfc;
  padding: 12px;
  overflow: hidden;
}
.map-columns { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; position: relative; z-index: 2; }
.map-column { min-width: 0; }
.map-column-header {
  padding: 10px 10px 8px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  border-bottom: 2px solid var(--black);
}
.map-card-list {
  min-height: 240px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px dashed var(--line);
  border-top: 0;
}
.map-card {
  background: var(--paper);
  border: 1px solid var(--black);
  padding: 10px;
  cursor: grab;
  position: relative;
  user-select: none;
}
.map-card:active { cursor: grabbing; }
.map-card.selected { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.map-card .card-type { font-size: 9px; text-transform: uppercase; letter-spacing: .08em; color: var(--mid); font-weight: 800; }
.map-card .card-text { margin-top: 4px; white-space: pre-wrap; overflow-wrap: anywhere; }
.card-controls { margin-top: 8px; display: flex; justify-content: flex-end; gap: 5px; }
.map-card button { font-size: 11px; border: 0; background: none; text-decoration: underline; padding: 1px 2px; cursor: pointer; }
.map-card button:hover { color: var(--accent); }
.connection-mode { border-color: var(--accent); color: var(--accent); }
.connection-help { margin-top: 9px; padding: 8px 10px; background: var(--accent-soft); color: #22325d; font-size: .78rem; display: none; }
.connection-help.active { display: block; }
.map-overlay { position: absolute; inset: 12px; width: calc(100% - 24px); height: calc(100% - 24px); pointer-events: none; z-index: 3; }
.map-overlay line { stroke: var(--accent); stroke-width: 1.5; opacity: .75; }

.review-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.review-panel { border: 1px solid var(--line); }
.review-panel h3 { margin: 0; padding: 10px 12px; background: var(--soft); font-size: .82rem; }
.review-content { padding: 12px; min-height: 150px; }
.review-list { margin: 0; padding-left: 18px; }
.review-list li { margin: 4px 0; }

.empty { color: var(--mid); padding: 16px 2px; font-size: .82rem; }
.site-footer {
  margin-top: 26px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--mid);
  font-size: 11px;
}

.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 20px; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(17,17,17,.48); }
.modal-panel {
  position: relative;
  width: min(780px, 100%);
  max-height: 86vh;
  overflow: auto;
  background: var(--paper);
  border: 1px solid var(--black);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--black);
  position: sticky;
  top: 0;
  background: var(--paper);
}
.modal-header h2 { margin: 0; font-size: 18px; }
.modal-body { padding: 18px; }
.modal-body h3 { margin: 18px 0 8px; font-size: 13px; }
.modal-body h3:first-child { margin-top: 0; }
.modal-body p { margin: 0 0 10px; }
.modal-body ul { margin: 8px 0 12px 20px; }
.help-grid .callout { margin-bottom: 10px; }

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 120;
  background: var(--black);
  color: #fff;
  padding: 10px 12px;
  border: 1px solid var(--black);
  font-size: 11px;
  max-width: 340px;
}

body.focus-mode .section:not(.section-focused) { display: none; }

@media (max-width: 850px) {
  .site-header { flex-direction: column; align-items: stretch; }
  .header-actions { justify-content: flex-start; }
  .intro-grid, .setup-grid, .review-grid { grid-template-columns: 1fr; }
  .map-intro { flex-direction: column; }
  .site-footer { flex-direction: column; gap: 6px; }
}
@media (max-width: 620px) {
  .site-header { padding: 20px 16px; }
  .app-shell { padding: 0 14px 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .map-columns { grid-template-columns: 1fr; }
  .map-card-list { min-height: 120px; }
  .session-bar { align-items: flex-start; }
}

/* GitHub playground return link */
body > a[href="/"] {
  border-radius: 2px !important;
}