/**
 * Phase 1a — shared brand tokens (lightweight).
 * Apps mount this file; do not replace existing CSS.
 */
:root {
  --bm-brand: #16705b;
  --bm-brand-dark: #10272b;
  --bm-brand-soft: #e9f4f1;
  --bm-ok: #15803d;
  --bm-warn: #a16207;
  --bm-danger: #b42318;
  --bm-ink: #182225;
  --bm-muted: #68767c;
  --bm-line: #dce5e8;
  --bm-bg: #f4f7f6;
  --bm-card: #ffffff;
  --bm-radius: 12px;
  --bm-radius-sm: 8px;
  --bm-gap: 12px;
  --bm-gap-lg: 16px;
  --bm-btn-height: 48px;
  --bm-cta-height: 52px;
  --bm-safe-top: env(safe-area-inset-top, 0px);
  --bm-safe-bottom: env(safe-area-inset-bottom, 0px);
}

.bm-btn-primary,
button.bm-btn-primary {
  min-height: var(--bm-btn-height);
  border-radius: var(--bm-radius-sm);
  background: var(--bm-brand);
  color: #fff;
  font-weight: 800;
  border: 0;
}

.bm-status-ok { color: var(--bm-ok); }
.bm-status-warn { color: var(--bm-warn); }
.bm-status-danger { color: var(--bm-danger); }

.status.ok,
.bm-pill-ok {
  background: #ecfdf3;
  color: var(--bm-ok);
}
.status.warn,
.bm-pill-warn {
  background: #fff7ed;
  color: var(--bm-warn);
}
.status.danger,
.bm-pill-danger {
  background: #fef2f2;
  color: var(--bm-danger);
}

.bm-card-gap {
  display: grid;
  gap: var(--bm-gap);
}

.bm-sticky-cta {
  position: sticky;
  bottom: 0;
  z-index: 40;
  display: grid;
  gap: 8px;
  padding: 12px 12px calc(12px + var(--bm-safe-bottom));
  margin: 16px -4px 0;
  background: linear-gradient(180deg, rgba(244, 247, 246, 0.2), var(--bm-bg) 28%);
  border-top: 1px solid var(--bm-line);
  box-shadow: 0 -8px 24px rgba(16, 39, 43, 0.06);
}

.bm-sticky-cta button {
  min-height: var(--bm-cta-height);
  width: 100%;
}

.bm-toast-host {
  position: fixed;
  left: 50%;
  top: calc(12px + var(--bm-safe-top));
  bottom: auto;
  transform: translateX(-50%);
  z-index: 20000;
  display: grid;
  gap: 8px;
  width: min(920px, calc(100vw - 24px));
  max-height: min(48dvh, 520px);
  overflow-y: auto;
  overscroll-behavior: contain;
  pointer-events: none;
}

.bm-toast {
  pointer-events: auto;
  padding: 12px 14px;
  border-radius: var(--bm-radius-sm);
  background: var(--bm-brand-dark);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 10px 28px rgba(16, 39, 43, 0.22);
  animation: bm-toast-in 0.2s ease;
}

.bm-toast.is-ok { background: var(--bm-ok); }
.bm-toast.is-warn { background: var(--bm-warn); }
.bm-toast.is-danger { background: var(--bm-danger); }

@keyframes bm-toast-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.bm-teacher-cards {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.bm-teacher-card {
  display: grid;
  gap: 6px;
  text-align: left;
  padding: 12px;
  border: 1.5px solid var(--bm-line);
  border-radius: var(--bm-radius);
  background: var(--bm-card);
  color: var(--bm-ink);
  min-height: var(--bm-btn-height);
  cursor: pointer;
}

.bm-teacher-card.is-selected {
  border-color: var(--bm-brand);
  box-shadow: 0 0 0 2px rgba(22, 112, 91, 0.18);
  background: var(--bm-brand-soft);
}

.bm-teacher-card.is-unavailable {
  opacity: 0.92;
}

.bm-teacher-card strong {
  font-size: 15px;
}

.bm-teacher-card .mini {
  color: var(--bm-muted);
  font-size: 12px;
  line-height: 1.45;
}

.bm-summary-card {
  display: grid;
  gap: 6px;
  padding: 12px 14px;
  margin: 0 0 12px;
  border-radius: var(--bm-radius);
  background: var(--bm-brand-soft);
  border: 1px solid #cfe3dc;
}

.bm-summary-card .title {
  font-weight: 800;
  color: var(--bm-brand-dark);
}

.bm-summary-card .row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  font-size: 13px;
  color: var(--bm-ink);
}

.bm-summary-card .row span {
  color: var(--bm-muted);
}

.bm-select-fallback {
  margin-top: 8px;
}

.bm-accordion {
  border: 1px solid var(--bm-line);
  border-radius: var(--bm-radius);
  background: var(--bm-card);
  margin: 0 0 var(--bm-gap-lg);
  overflow: hidden;
}

.bm-accordion > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 800;
  background: #f8fbfa;
  border-bottom: 1px solid transparent;
}

.bm-accordion[open] > summary {
  border-bottom-color: var(--bm-line);
}

.bm-accordion > summary::-webkit-details-marker {
  display: none;
}

.bm-accordion-body {
  padding: 12px;
}

.bm-placeholder {
  padding: 14px;
  border: 1px dashed #b7ccc5;
  border-radius: var(--bm-radius-sm);
  background: #f7fbf9;
  color: var(--bm-muted);
  font-size: 13px;
  line-height: 1.5;
}

/* Phase 2 — configurable URL backgrounds (no R2 / no binary in D1) */
.bm-bg-host {
  position: relative;
  isolation: isolate;
}

.bm-bg-host > .bm-bg-layer {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bm-bg-host.login-screen > .bm-bg-layer,
.login-screen.bm-bg-host > .bm-bg-layer {
  position: fixed;
}

.bm-bg-host > .bm-bg-layer .bm-bg-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, #10272b, #16705b 70%);
  opacity: 0.72;
}

.bm-bg-host.bm-bg-active > *:not(.bm-bg-layer) {
  position: relative;
  z-index: 1;
}

body.bm-bg-host {
  min-height: 100vh;
}

body.bm-bg-host > .bm-bg-layer {
  position: fixed;
  z-index: -1;
}

.bm-bg-preview {
  position: relative;
  min-height: 140px;
  border-radius: var(--bm-radius);
  overflow: hidden;
  border: 1px solid var(--bm-line);
  background: #eef3f0;
}

.bm-bg-preview-label {
  position: absolute;
  left: 10px;
  bottom: 10px;
  z-index: 2;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(16, 39, 43, 0.78);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.bm-soft-note {
  margin: 8px 0 0;
  padding: 10px 12px;
  border-radius: var(--bm-radius-sm);
  background: #fff7ed;
  color: #9a3412;
  font-size: 12px;
  line-height: 1.45;
}

.bm-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}

.bm-confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(16, 39, 43, 0.45);
}

.bm-confirm-card {
  width: min(420px, 100%);
  display: grid;
  gap: 12px;
  padding: 18px 16px 14px;
  border-radius: var(--bm-radius);
  background: var(--bm-card);
  color: var(--bm-ink);
  box-shadow: 0 18px 40px rgba(16, 39, 43, 0.28);
}

.bm-confirm-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
}

.bm-confirm-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--bm-muted);
  white-space: pre-wrap;
}

.bm-confirm-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 4px;
}

.bm-confirm-cancel,
.bm-confirm-ok {
  min-height: var(--bm-btn-height);
  border-radius: var(--bm-radius-sm);
  font-weight: 800;
  border: 0;
  cursor: pointer;
}

.bm-confirm-cancel {
  background: #eef2f1;
  color: var(--bm-ink);
}

.bm-confirm-ok {
  background: var(--bm-brand);
  color: #fff;
}

@media (max-width: 420px) {
  .bm-sticky-cta {
    margin-left: -8px;
    margin-right: -8px;
  }
}