/* =============================================================================
   Building Airflow Designer — dedicated app shell, not the shared tools.css
   component set. Uses the site's colour tokens (variables.css) so dark mode
   and brand colour stay consistent, but its layout, cards, tables and badges
   are all built fresh for a denser, standalone-app feel.
   ========================================================================== */

:root {
  --bad-radius: 10px;
  --bad-radius-sm: 6px;
  --bad-shadow: 0 1px 2px rgba(15, 23, 20, 0.06), 0 6px 20px rgba(15, 23, 20, 0.05);
  --bad-appbar-bg: #1b2420;
  --bad-appbar-fg: #f3f6f4;
  --bad-rail-width: 220px;
  --bad-green: #4a9950;
  --bad-blue: #3b7fd6;
  --bad-red: #c1503f;
  --bad-amber: #c98a2e;
}

:root[data-theme="dark"] {
  --bad-appbar-bg: #0c100e;
  --bad-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body.bad-body {
  margin: 0;
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-family: var(--font-body);
}

.bad-appbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 56px;
  padding: 0 20px;
  background: var(--bad-appbar-bg);
  color: var(--bad-appbar-fg);
}

.bad-appbar__logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; flex-shrink: 0; }
.bad-appbar__logo img { height: 22px; width: auto; }
.bad-appbar__divider { width: 1px; height: 22px; background: rgba(255,255,255,0.18); flex-shrink: 0; }
.bad-appbar__title { font-weight: 700; font-size: 0.95rem; letter-spacing: -0.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bad-appbar__spacer { flex: 1 1 auto; }

.bad-appbar__link {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}
.bad-appbar__link:hover { color: #fff; }

@media (max-width: 640px) {
  .bad-appbar { gap: 10px; padding: 0 12px; }
  .bad-appbar__title, .bad-appbar__divider, .bad-appbar__link--secondary { display: none; }
}

.bad-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  background: transparent;
  color: rgba(255,255,255,0.85);
  cursor: pointer;
  flex-shrink: 0;
}
.bad-theme-toggle svg { width: 16px; height: 16px; }
.bad-theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .bad-theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .bad-theme-toggle .icon-sun { display: block; }

.bad-shell {
  display: flex;
  align-items: flex-start;
  max-width: 1440px;
  margin: 0 auto;
}

.bad-rail {
  position: sticky;
  top: 56px;
  flex: 0 0 var(--bad-rail-width);
  width: var(--bad-rail-width);
  height: calc(100vh - 56px);
  overflow-y: auto;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 20px 0;
}

.bad-rail__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  border-left: 3px solid transparent;
}
.bad-rail__item:hover { color: var(--color-text); background: var(--color-bg-alt); }
.bad-rail__item.is-active { color: var(--bad-green); border-left-color: var(--bad-green); background: var(--color-primary-soft); }

.bad-rail__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}
.bad-rail__item.is-active .bad-rail__num { background: var(--bad-green); color: #fff; }

.bad-rail__foot { padding: 16px 20px 0; margin-top: 12px; border-top: 1px solid var(--color-border); }
.bad-rail__foot a { font-size: 0.78rem; color: var(--color-text-muted); }

@media (max-width: 900px) {
  .bad-shell { flex-direction: column; }
  .bad-rail {
    position: sticky;
    top: 56px;
    width: 100%;
    height: auto;
    display: flex;
    overflow-x: auto;
    padding: 0;
    z-index: 15;
  }
  .bad-rail__item { flex: 0 0 auto; border-left: none; border-bottom: 3px solid transparent; white-space: nowrap; }
  .bad-rail__item.is-active { border-left-color: transparent; border-bottom-color: var(--bad-green); }
  .bad-rail__foot { display: none; }
}

.bad-main { flex: 1 1 0; min-width: 0; padding: 28px 28px 60px; }
@media (max-width: 600px) {
  .bad-main { padding: 20px 16px 48px; }
}

.bad-hero { margin-bottom: 24px; }
.bad-hero h1 { margin: 0 0 6px; font-size: 1.5rem; letter-spacing: -0.02em; }
.bad-hero p { margin: 0; color: var(--color-text-muted); font-size: 0.92rem; max-width: 68ch; }

.bad-panel {
  background: var(--color-surface);
  border-radius: var(--bad-radius);
  box-shadow: var(--bad-shadow);
  padding: 22px;
  margin-bottom: 24px;
}

.bad-panel__head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.bad-panel__head h2 { margin: 0; font-size: 1.05rem; }
.bad-panel__head p { margin: 4px 0 0; font-size: 0.82rem; color: var(--color-text-muted); }

.bad-grid { display: grid; grid-template-columns: minmax(220px, 300px) 1fr; gap: 20px; align-items: start; }
@media (max-width: 820px) { .bad-grid { grid-template-columns: 1fr; } }

.bad-method-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 480px) { .bad-method-cards { grid-template-columns: 1fr; } }

.bad-method-card {
  display: block;
  text-align: left;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--bad-radius-sm);
  background: var(--color-bg-alt);
  padding: 12px;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
.bad-method-card:hover { border-color: var(--bad-green); }
.bad-method-card.is-selected { border-color: var(--bad-green); background: var(--color-primary-soft); }
.bad-method-card__icon { font-size: 1.2rem; margin-bottom: 4px; }
.bad-method-card__title { font-weight: 700; font-size: 0.82rem; margin-bottom: 2px; }
.bad-method-card__sub { font-size: 0.72rem; color: var(--color-text-muted); line-height: 1.3; }

.bad-add-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 9px 16px;
  border: none;
  border-radius: var(--bad-radius-sm);
  background: var(--bad-green);
  color: #fff;
  font-weight: 700;
  font-size: 0.84rem;
  cursor: pointer;
}
.bad-add-btn:hover { background: var(--color-primary-hover); }

.bad-room-count { font-size: 0.82rem; font-weight: 700; color: var(--color-text-muted); margin-bottom: 10px; }

.bad-room-list { display: flex; flex-direction: column; gap: 8px; }
.bad-room-empty {
  border: 1px dashed var(--color-border);
  border-radius: var(--bad-radius-sm);
  padding: 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.86rem;
}

.bad-room-card { border: 1px solid var(--color-border); border-radius: var(--bad-radius-sm); overflow: hidden; }

.bad-room-row {
  display: grid;
  grid-template-columns: 28px 1fr 120px 90px 90px 72px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--color-surface);
}
@media (max-width: 700px) {
  .bad-room-row { grid-template-columns: 24px 1fr 72px; }
  .bad-room-row__role, .bad-room-row__supply, .bad-room-row__exhaust { display: none; }
}

.bad-room-row__num { color: var(--color-text-muted); font-size: 0.8rem; font-weight: 700; }
.bad-room-row__name-input {
  border: none;
  background: transparent;
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--color-text);
  padding: 2px 0;
  border-bottom: 1px dashed transparent;
  width: 100%;
}
.bad-room-row__name-input:hover, .bad-room-row__name-input:focus { border-bottom-color: var(--color-border); outline: none; }
.bad-room-row__type { display: block; font-size: 0.74rem; color: var(--color-text-muted); margin-top: 1px; }

.bad-chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
}
.bad-chip--balanced { background: rgba(59, 127, 214, 0.14); color: var(--bad-blue); }
.bad-chip--supply { background: rgba(74, 153, 80, 0.14); color: var(--bad-green); }
.bad-chip--exhaust { background: rgba(193, 80, 63, 0.14); color: var(--bad-red); }

.bad-room-row__value { font-size: 0.86rem; font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }
.bad-room-row__actions { display: flex; gap: 6px; justify-content: flex-end; }

.bad-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--bad-radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
}
.bad-icon-btn:hover { color: var(--color-text); border-color: var(--color-text-muted); }
.bad-icon-btn svg { width: 13px; height: 13px; }

.bad-room-edit { background: var(--color-bg-alt); padding: 16px; border-top: 1px solid var(--color-border); }
.bad-room-edit .field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px 16px; }
.bad-room-edit .field { display: flex; flex-direction: column; gap: 5px; }
.bad-room-edit .field--span { grid-column: 1 / -1; }
.bad-room-edit label { font-size: 0.76rem; font-weight: 600; color: var(--color-text-muted); }
.bad-room-edit input, .bad-room-edit select {
  padding: 7px 9px;
  border-radius: var(--bad-radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.86rem;
  font-family: inherit;
}
.bad-room-edit .calc__hint { grid-column: 1 / -1; margin: 0; font-size: 0.78rem; color: var(--color-text-muted); }
.bad-room-edit__top { display: flex; flex-wrap: wrap; gap: 12px 16px; margin-bottom: 14px; }
.bad-room-edit__top .field { flex: 1 1 180px; }

.bad-stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
@media (max-width: 760px) { .bad-stat-grid { grid-template-columns: 1fr 1fr; } }

.bad-stat {
  background: var(--color-surface);
  border-radius: var(--bad-radius);
  box-shadow: var(--bad-shadow);
  padding: 16px;
}
.bad-stat--dark { background: var(--bad-appbar-bg); color: #f3f6f4; }
.bad-stat--dark .bad-stat__label { color: rgba(255,255,255,0.7); }
.bad-stat__label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-muted); margin-bottom: 6px; }
.bad-stat__value { font-size: 1.3rem; font-weight: 700; font-variant-numeric: tabular-nums; }

.bad-chart-row { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .bad-chart-row { grid-template-columns: 1fr; } }

.bad-chart-card {
  background: var(--color-surface);
  border-radius: var(--bad-radius);
  box-shadow: var(--bad-shadow);
  padding: 16px;
}
.bad-chart-card h3 { margin: 0 0 12px; font-size: 0.86rem; }

.bad-donut-wrap { display: flex; align-items: center; justify-content: center; position: relative; }
.bad-donut-center { position: absolute; text-align: center; pointer-events: none; }
.bad-donut-center__value { font-size: 1.1rem; font-weight: 700; }
.bad-donut-center__label { font-size: 0.64rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.03em; }

.bad-legend { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; font-size: 0.78rem; }
.bad-legend__row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.bad-legend__swatch { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 6px; }

.bad-gauge-wrap { display: flex; flex-direction: column; align-items: center; }
.bad-gauge-value { font-size: 1.3rem; font-weight: 700; margin-top: 4px; }
.bad-gauge-status { font-size: 0.78rem; color: var(--color-text-muted); text-align: center; margin-top: 2px; }

.bad-table { width: 100%; border-collapse: collapse; font-size: 0.84rem; }
.bad-table th, .bad-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--color-border); }
.bad-table th { font-weight: 700; color: var(--color-text-muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.03em; }
.bad-table td { color: var(--color-text); }
.bad-table-wrap { overflow-x: auto; }

.bad-field-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 820px) { .bad-field-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .bad-field-grid { grid-template-columns: 1fr; } }
.bad-field-grid .field { display: flex; flex-direction: column; gap: 5px; }
.bad-field-grid .field--span { grid-column: 1 / -1; }
.bad-field-grid label { font-size: 0.78rem; font-weight: 600; color: var(--color-text-muted); }
.bad-field-grid input {
  padding: 8px 10px;
  border-radius: var(--bad-radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-size: 0.88rem;
  font-family: inherit;
}

.bad-report-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.bad-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--bad-radius-sm);
  font-weight: 700;
  font-size: 0.86rem;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
}
.bad-btn:hover { border-color: var(--color-text-muted); }
.bad-btn--primary { background: var(--bad-green); border-color: var(--bad-green); color: #fff; }
.bad-btn--primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }

.bad-badge { display: inline-flex; align-items: center; padding: 5px 12px; border-radius: 100px; font-weight: 700; font-size: 0.82rem; }
.bad-badge--pass { background: rgba(74, 153, 80, 0.14); color: var(--bad-green); }
.bad-badge--warn { background: rgba(201, 138, 46, 0.16); color: var(--bad-amber); }
.bad-badge--fail { background: rgba(193, 80, 63, 0.14); color: var(--bad-red); }

.bad-footer {
  padding: 16px 28px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.78rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.bad-footer a { color: inherit; }

.bad-prose { max-width: 880px; padding: 8px 0 40px; }
.bad-prose h2 { font-size: 1.1rem; margin: 28px 0 10px; }
.bad-prose h3 { font-size: 0.96rem; margin: 18px 0 8px; }
.bad-prose p { font-size: 0.88rem; color: var(--color-text-muted); line-height: 1.6; }
.bad-prose code.bad-formula {
  display: block;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--bad-radius-sm);
  padding: 12px 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
  margin: 10px 0;
}
.bad-prose .bad-callout {
  background: var(--color-primary-soft);
  border-radius: var(--bad-radius-sm);
  padding: 14px 16px;
  margin: 16px 0;
}
.bad-prose .bad-callout p { color: var(--color-text); margin: 0; }
.bad-faq-item { margin-bottom: 14px; }
.bad-faq-item h3 { margin: 0 0 4px; }