/* ================================================================
   Brut Decision Tree — Frontend Styles
   ================================================================ */

.bdt-container {
  --bdt-bg:       #f2f6fa;
  --bdt-surface:  #ffffff;
  --bdt-blue:     #6babd0;
  --bdt-blue-dk:  #4a8db8;
  --bdt-blue-lt:  #e8f3f9;
  --bdt-success:  #1a7a4a;
  --bdt-suc-lt:   #e8f5ee;
  --bdt-danger:   #b83228;
  --bdt-dan-lt:   #fdf0ef;
  --bdt-warning:  #c97a10;
  --bdt-war-lt:   #fef5e6;
  --bdt-text:     #1c2b3a;
  --bdt-muted:    #6b7f91;
  --bdt-border:   #d0e3ef;
  --bdt-radius:   12px;
  --bdt-shadow:   0 3px 16px rgba(107,171,208,.13);
  --bdt-shadow-h: 0 8px 28px rgba(107,171,208,.25);
  --bdt-shadow-btn: 0 4px 24px rgba(107,171,208,.4);
  --bdt-t:        .24s cubic-bezier(.4,0,.2,1);

  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

/* ── Connector ── */
.bdt-conn {
  display: flex;
  justify-content: center;
  height: 30px;
  flex-shrink: 0;
}
.bdt-conn::before {
  content: '';
  width: 2px;
  height: 100%;
  background: var(--bdt-blue);
  opacity: .35;
  border-radius: 2px;
}

/* ── Entry button ── */
.bdt-entry-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: var(--bdt-blue);
  color: #fff;
  border: none;
  border-radius: var(--bdt-radius);
  padding: 22px 40px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--bdt-shadow-btn);
  transition: background var(--bdt-t), box-shadow var(--bdt-t), transform var(--bdt-t);
  width: 100%;
}
.bdt-entry-btn:hover {
  background: var(--bdt-blue-dk);
  box-shadow: var(--bdt-shadow-h);
  transform: translateY(-1px);
}
.bdt-et {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .01em;
  line-height: 1.3;
}
.bdt-es {
  font-size: 14px;
  font-weight: 400;
  opacity: .8;
  letter-spacing: .04em;
}

/* ── Intermediate node label ── */
.bdt-node-lbl {
  background: var(--bdt-blue);
  color: #fff;
  border-radius: var(--bdt-radius);
  padding: 16px 22px;
  text-align: center;
  box-shadow: var(--bdt-shadow);
}
.bdt-nt { font-weight: 700; font-size: 14px; letter-spacing: .02em; }
.bdt-nd {
  font-size: 14px;
  font-weight: 400;
  opacity: .85;
  margin-top: 8px;
  line-height: 1.6;
  text-align: left;
}
.bdt-nd ul  { padding-left: 14px; margin-top: 4px; }
.bdt-nd li  { margin-bottom: 2px; }

/* ── Choices grid ── */
.bdt-cgrid { display: grid; gap: 12px; }
.bdt-c1 { grid-template-columns: 1fr; }
.bdt-c2 { grid-template-columns: 1fr 1fr; }
.bdt-c3 { grid-template-columns: 1fr 1fr 1fr; }

/* ── Choice card ── */
.bdt-ccard {
  background: var(--bdt-surface);
  border: 2px solid var(--bdt-border);
  border-radius: var(--bdt-radius);
  padding: 16px 16px 16px 44px;
  cursor: pointer;
  transition: border-color var(--bdt-t), box-shadow var(--bdt-t), transform var(--bdt-t), background var(--bdt-t);
  position: relative;
  min-height: 58px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.bdt-ccard:hover {
  border-color: var(--bdt-blue);
  box-shadow: var(--bdt-shadow-h);
  transform: translateY(-2px);
}
.bdt-ccard.bdt-sel {
  border-color: var(--bdt-blue);
  background: var(--bdt-blue-lt);
}
.bdt-rd {
  position: absolute;
  left: 14px; top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  border: 2px solid var(--bdt-border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--bdt-t);
  flex-shrink: 0;
}
.bdt-sel .bdt-rd { background: var(--bdt-blue); border-color: var(--bdt-blue); }
.bdt-sel .bdt-rd::after {
  content: '';
  width: 8px; height: 8px;
  background: #fff;
  border-radius: 50%;
}
.bdt-ct { font-weight: 700; font-size: 14px; color: var(--bdt-blue-dk); line-height: 1.3; }
.bdt-cd { font-size: 14px; color: var(--bdt-muted); line-height: 1.55; margin-top: 4px; }

/* ── Result card ── */
.bdt-rcard {
  border-radius: var(--bdt-radius);
  padding: 22px 26px;
  border-left: 5px solid;
  box-shadow: var(--bdt-shadow);
}
.bdt-green  { background: var(--bdt-suc-lt); border-color: var(--bdt-success); }
.bdt-red    { background: var(--bdt-dan-lt); border-color: var(--bdt-danger); }
.bdt-orange { background: var(--bdt-war-lt); border-color: var(--bdt-warning); }

.bdt-rtitle { font-size: 14px; font-weight: 700; margin-bottom: 9px; }
.bdt-green  .bdt-rtitle { color: var(--bdt-success); }
.bdt-red    .bdt-rtitle { color: var(--bdt-danger); }
.bdt-orange .bdt-rtitle { color: var(--bdt-warning); }

.bdt-rbody { font-size: 14px; line-height: 1.7; color: var(--bdt-text); }
.bdt-rbody ul { padding-left: 16px; margin-top: 6px; }
.bdt-rbody li { margin-bottom: 3px; }

/* ── Reset button ── */
.bdt-reset-wrap { display: flex; justify-content: center; margin-top: 8px; }
.bdt-reset-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: none;
  border: 1.5px solid var(--bdt-border);
  border-radius: 50px;
  padding: 9px 24px;
  font-size: 14px;
  color: var(--bdt-muted);
  cursor: pointer;
  transition: all var(--bdt-t);
}
.bdt-reset-btn:hover {
  border-color: var(--bdt-blue);
  color: var(--bdt-blue);
  background: var(--bdt-blue-lt);
}

/* ── Animations ── */
@keyframes bdt-fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.bdt-new { animation: bdt-fadeUp .34s cubic-bezier(.4,0,.2,1) both; }
.bdt-d0 { animation-delay: 0s; }
.bdt-d1 { animation-delay: .07s; }
.bdt-d2 { animation-delay: .14s; }

/* ── Responsive ── */
@media (max-width: 560px) {
  .bdt-c2, .bdt-c3 { grid-template-columns: 1fr; }
  .bdt-et { font-size: 14px; }
  .bdt-entry-btn { padding: 18px 20px; }
}