:root {
  --bg-deepest: #020b17;
  --bg-deep:    #030d1d;
  --bg-card:    #041826;
  --accent:         #1E88E5;
  --accent-dim:     rgba(30,136,229,0.12);
  --accent-border:  rgba(30,136,229,0.25);
  --accent-glow:    rgba(30,136,229,0.35);
  --green: #639922;
  --text-primary:   #fff;
  --text-secondary: rgba(255,255,255,0.68);
  --text-muted:     rgba(255,255,255,0.40);
  --text-micro:     rgba(255,255,255,0.25);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
}

html, body { margin: 0; padding: 0; background: var(--bg-deepest); overflow-x: hidden; }

/* ── Wizard single-column ──────────────────────────────── */
.bk-wizard { max-width: 520px; margin: 0 auto; padding: 32px 28px; }
@media (max-width: 580px) { .bk-wizard { padding: 22px 16px; } }

/* ── Meeting info ──────────────────────────────────────── */
.bk-mt-name { font-size: 1.15rem; font-weight: 900; color: var(--text-primary); letter-spacing: -0.02em; margin-bottom: 0.35rem; }
.bk-mt-desc { font-size: 0.83rem; line-height: 1.65; color: var(--text-secondary); margin-bottom: 1.1rem; }
.bk-info-row { display: flex; align-items: center; gap: 9px; font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 6px; }
.bk-info-row svg { color: var(--accent); flex-shrink: 0; }

/* ── Timezone ──────────────────────────────────────────── */
.bk-tz-wrap { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid rgba(255,255,255,0.06); }
.bk-label {
  font-size: 0.62rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-muted); display: block; margin-bottom: 0.5rem;
}
.bk-label-spaced { margin-bottom: 0.75rem; }
.bk-tz-select {
  width: 100%; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px; padding: 9px 12px; font-size: 0.82rem; color: var(--text-primary);
  outline: none; appearance: none; cursor: pointer; transition: border-color 0.2s; font-family: inherit;
}
.bk-tz-select:focus { border-color: rgba(30,136,229,0.5); }
.bk-tz-hint { font-size: 0.7rem; color: var(--text-micro); margin-top: 5px; }

/* ── Calendar ──────────────────────────────────────────── */
.bk-cal-wrap { margin-top: 1.25rem; }
.bk-cal-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.85rem; }
.bk-cal-month { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); }
.bk-nav-btn {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px; width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-secondary); transition: all 0.2s;
}
.bk-nav-btn:hover:not(:disabled) { background: var(--accent-dim); border-color: var(--accent-border); color: #fff; }
.bk-nav-btn:disabled { opacity: 0.25; cursor: not-allowed; }
.bk-cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }
.bk-dow { font-size: 0.62rem; font-weight: 700; text-align: center; color: var(--text-muted); padding: 5px 0; text-transform: uppercase; letter-spacing: 0.06em; }
.bk-day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border-radius: 8px; font-size: 0.82rem; font-weight: 600; cursor: default;
  color: var(--text-muted); border: 1px solid transparent; transition: all 0.15s;
}
.bk-day.has-slots  { color: var(--text-primary); background: rgba(30,136,229,0.1); border-color: rgba(30,136,229,0.2); cursor: pointer; }
.bk-day.has-slots:hover { background: rgba(30,136,229,0.22); border-color: rgba(30,136,229,0.38); }
.bk-day.selected   { background: var(--accent) !important; color: #fff !important; border-color: var(--accent) !important; box-shadow: 0 4px 12px var(--accent-glow); }
.bk-day.today      { font-weight: 800; }
.bk-day.past       { opacity: 0.18; }
.bk-cal-loading    { text-align: center; padding: 1.5rem 0; color: var(--text-muted); font-size: 0.82rem; display: none; }
.bk-spinner        { width: 18px; height: 18px; border: 2px solid rgba(30,136,229,0.2); border-top-color: var(--accent); border-radius: 50%; animation: bk-spin 0.8s linear infinite; margin: 0 auto 6px; }

/* ── Slots ─────────────────────────────────────────────── */
.bk-slots-wrap { margin-top: 1.1rem; }
.bk-slots-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.bk-slot {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 7px; padding: 9px 4px; text-align: center;
  font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.bk-slot:hover    { background: var(--accent-dim); border-color: var(--accent-border); color: #fff; }
.bk-slot.selected { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 3px 10px var(--accent-glow); }
.bk-no-slots { text-align: center; padding: 1.25rem 0; color: var(--text-muted); font-size: 0.82rem; display: none; }

/* ── Weiter button ─────────────────────────────────────── */
.bk-weiter {
  width: 100%; margin-top: 1.25rem;
  background: var(--accent); color: #fff; border: none; border-radius: 8px;
  padding: 13px 20px; font-size: 0.9rem; font-weight: 700; cursor: pointer;
  display: none; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 4px 18px var(--accent-glow); transition: background 0.2s, transform 0.15s;
}
.bk-weiter:hover { background: #1976d2; transform: translateY(-1px); }

/* ── Step 2 header (Zurück + Slot-Preview) ─────────────── */
.bk-step2-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 1.25rem; padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.bk-back-btn {
  background: none; border: none; color: var(--text-muted); cursor: pointer;
  display: flex; align-items: center; gap: 5px;
  font-size: 0.78rem; font-weight: 600; padding: 0; flex-shrink: 0;
  transition: color 0.2s;
}
.bk-back-btn:hover { color: var(--accent); }
.bk-slot-chosen {
  flex: 1; background: rgba(30,136,229,0.08); border: 1px solid rgba(30,136,229,0.2);
  border-radius: 8px; padding: 8px 12px; font-size: 0.82rem; color: var(--text-secondary);
}
.bk-slot-chosen strong { color: var(--text-primary); }

/* ── Form ──────────────────────────────────────────────── */
.bk-form-heading { font-size: 1rem; font-weight: 800; color: var(--text-primary); margin-bottom: 1rem; letter-spacing: -0.015em; }
.bk-field-group { margin-bottom: 10px; }
.bk-field {
  width: 100%; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px; padding: 10px 14px; font-size: 0.86rem; color: var(--text-primary);
  outline: none; transition: border-color 0.2s, background 0.2s; font-family: inherit;
}
.bk-field::placeholder { color: rgba(255,255,255,0.22); }
.bk-field:focus  { border-color: rgba(30,136,229,0.5); background: rgba(30,136,229,0.04); }
.bk-field.error  { border-color: rgba(220,53,69,0.6); }
textarea.bk-field { resize: vertical; min-height: 80px; }
.bk-err { font-size: 0.72rem; color: #ef4444; margin-top: 4px; display: none; }
.bk-err-privacy-spaced { margin-top: -6px; margin-bottom: 10px; }
.bk-err-spaced { margin-bottom: 10px; }
.bk-privacy {
  display: flex; align-items: flex-start; gap: 10px;
  background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.07);
  border-radius: 8px; padding: 10px 13px; margin-bottom: 12px; cursor: pointer;
}
.bk-privacy input { margin-top: 2px; flex-shrink: 0; accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }
.bk-privacy label { font-size: 0.76rem; color: rgba(255,255,255,0.4); line-height: 1.5; cursor: pointer; }
.bk-privacy label a { color: var(--accent); text-decoration: none; }
.bk-submit {
  width: 100%; background: var(--accent); color: #fff; border: none; border-radius: 8px;
  padding: 13px 20px; font-size: 0.9rem; font-weight: 700; cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 4px 18px var(--accent-glow);
}
.bk-submit:hover:not(:disabled) { background: #1976d2; transform: translateY(-1px); }
.bk-submit:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Success ───────────────────────────────────────────── */
.bk-success { display: none; text-align: center; padding: 2rem 0; }
.bk-success-icon {
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(99,153,34,0.1); border: 1px solid rgba(99,153,34,0.25);
  display: flex; align-items: center; justify-content: center; margin: 0 auto 1.1rem;
}
.bk-success-h2  { font-size: 1.15rem; font-weight: 800; color: var(--text-primary); margin-bottom: 0.45rem; }
.bk-success-sub { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 1.25rem; }
.bk-detail-card {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-md); padding: 1rem; text-align: left; margin-bottom: 1.1rem;
}
.bk-detail-row { display: flex; align-items: flex-start; gap: 9px; margin-bottom: 7px; }
.bk-detail-row:last-child { margin-bottom: 0; }
.bk-detail-row svg { color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.bk-detail-label { font-size: 0.67rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); }
.bk-detail-val   { font-size: 0.86rem; font-weight: 600; color: var(--text-primary); }
.bk-teams-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff !important; font-weight: 700; font-size: 0.88rem;
  padding: 12px 20px; border-radius: var(--radius-sm); text-decoration: none !important;
  margin-bottom: 8px; transition: background 0.2s; box-shadow: 0 4px 14px var(--accent-glow);
}
.bk-teams-btn:hover { background: #1976d2; }

/* ── Visibility toggles (were inline style="display:none;") ── */
.bk-hidden { display: none; }

/* ── Submit button loading spinner (was inline style on JS-injected div) ── */
.bk-btn-spinner {
  width: 15px; height: 15px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: bk-spin 0.8s linear infinite;
}

@keyframes bk-spin { to { transform: rotate(360deg); } }