:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #5d6572;
  --border: #d9dde3;
  --accent: #2c6e49;
  --accent-soft: #e2f0e8;
  --danger: #b3261e;
  --warn: #9a6700;
  --warn-soft: #fff4d6;
  --done: #8a929c;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a;
    --card: #1b1f26;
    --text: #e6e9ee;
    --muted: #9aa3ad;
    --border: #2c323b;
    --accent: #6fbf8f;
    --accent-soft: #1f2f27;
    --danger: #ff7b72;
    --warn: #e3b341;
    --warn-soft: #2d2711;
    --done: #6b737d;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  padding: 1.25rem 1rem 0.5rem;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}
.site-header h1 { margin: 0; font-size: 1.6rem; }
.subtitle { margin: 0.15rem 0 0; color: var(--muted); }

.tabs {
  display: flex;
  gap: 0.25rem;
  max-width: 900px;
  width: 100%;
  margin: 0.75rem auto 0;
  padding: 0 1rem;
  border-bottom: 1px solid var(--border);
}
.tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem;
}

.panel[hidden] { display: none; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  margin-bottom: 0.75rem;
}
.filter { display: flex; align-items: center; gap: 0.4rem; color: var(--muted); font-size: 0.9rem; }
.filter select {
  font: inherit;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
}
.summary { margin-left: auto; color: var(--muted); font-size: 0.9rem; }

.task-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }

.task {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  align-items: start;
}
.task input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.2rem;
  accent-color: var(--accent);
  cursor: pointer;
}
.task .title { font-weight: 600; cursor: pointer; color: var(--text); text-decoration: none; }
.task .title:hover { text-decoration: underline; color: var(--accent); }
.task.done .title { text-decoration: line-through; color: var(--done); }
.task.status-dropped .title { color: var(--done); }
.task .next { grid-column: 2; font-size: 0.9rem; color: var(--muted); margin: 0.15rem 0 0; }
.task .next strong { color: var(--text); font-weight: 600; }
.group-head {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0.6rem 0 -0.2rem;
  padding: 0 0.2rem;
}
.group-head:first-child { margin-top: 0; }
.task .meta {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.task .notes { grid-column: 2; font-size: 0.9rem; color: var(--muted); margin: 0.15rem 0 0; }

.badge {
  display: inline-block;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.78rem;
}
.badge.confirm, .badge.status-confirm { background: var(--warn-soft); color: var(--warn); }
.badge.status-done { background: transparent; color: var(--done); border: 1px solid var(--border); }
.badge.status-dropped { background: transparent; color: var(--done); border: 1px dashed var(--border); text-decoration: line-through; }
.chip {
  display: inline-block;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
  background: var(--card);
}
.chip.owner-ted { border-color: #3b7dd8; color: #3b7dd8; }
.chip.owner-melanie { border-color: #b5479a; color: #b5479a; }
.chip.owner-tbd { color: var(--muted); border-style: dashed; }
.due.overdue { color: var(--danger); font-weight: 600; }
.due.soon { color: var(--warn); font-weight: 600; }
.due.nodate { color: var(--muted); font-style: italic; }

/* buttons */
.btn {
  appearance: none;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  line-height: 1.3;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); color: #fff; }
.btn.small { font-size: 0.8rem; padding: 0.25rem 0.6rem; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* messages */
.msg {
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
}
.msg[hidden] { display: none; }
.msg.ok { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.msg.warn { color: var(--warn); border-color: var(--warn); background: var(--warn-soft); }
.msg.error { color: var(--danger); border-color: var(--danger); }
.msg.info { color: var(--muted); }

/* cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 0.9rem;
}
.card[hidden] { display: none; }

/* edit form */
.edit-form .form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1rem;
}
.edit-form .field { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
.edit-form .field.wide { grid-column: 1 / -1; }
.field-label { font-size: 0.8rem; font-weight: 600; color: var(--muted); }
.field-hint { font-size: 0.75rem; color: var(--muted); }
.edit-form input, .edit-form select, .edit-form textarea {
  font: inherit;
  width: 100%;
  padding: 0.4rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.edit-form input:focus, .edit-form select:focus, .edit-form textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.edit-form input[readonly] { color: var(--muted); }
.edit-form textarea { resize: vertical; min-height: 6rem; }
.edit-form .inline { display: flex; gap: 0.5rem; align-items: center; }
.edit-form .inline input { flex: 1; }
.links-edit { display: grid; gap: 0.4rem; margin-bottom: 0.4rem; }
.link-row { display: grid; grid-template-columns: 1fr 2fr auto; gap: 0.4rem; align-items: center; }
.form-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }

/* detail page */
.crumbs { margin: 0 0 0.3rem; font-size: 0.9rem; }
.crumbs a, .site-footer a { color: var(--accent); text-decoration: none; }
.crumbs a:hover, .site-footer a:hover { text-decoration: underline; }
.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem 1rem;
  margin: 0 0 1rem;
}
.detail-grid dt { font-size: 0.75rem; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.detail-grid dd { margin: 0.15rem 0 0; }
.detail-block { margin-top: 1rem; }
.detail-block h2 { font-size: 0.95rem; margin: 0 0 0.35rem; color: var(--muted); }
.detail-block p { margin: 0 0 0.6rem; }
.prose p { white-space: pre-line; }
.link-list { margin: 0; padding-left: 1.2rem; }
.link-list li { margin-bottom: 0.3rem; }
.link-list a { color: var(--accent); }
.link-url { color: var(--muted); word-break: break-all; }
.muted { color: var(--muted); }

.loading, .empty, .error { color: var(--muted); padding: 1rem; text-align: center; }
.error { color: var(--danger); }

.hint { color: var(--muted); font-size: 0.85rem; margin-top: 1rem; }
code { background: var(--accent-soft); padding: 0.05rem 0.35rem; border-radius: 4px; font-size: 0.9em; }

.note {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.note a { color: var(--accent); word-break: break-all; }

#network-frame {
  width: 100%;
  height: 75vh;
  min-height: 420px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 1rem;
}

@media (max-width: 600px) {
  .site-header h1 { font-size: 1.35rem; }
  .summary { margin-left: 0; width: 100%; }
  .task .meta { font-size: 0.8rem; }
  .toolbar { gap: 0.5rem 0.75rem; }
  .filter { font-size: 0.85rem; }
  #add-task { margin-left: auto; }
  .edit-form .form-grid { grid-template-columns: 1fr; }
  .link-row { grid-template-columns: 1fr; }
  .link-row .btn { justify-self: end; }
  .card { padding: 0.75rem; }
}