/* ============================================================
   DUSN UI / auth / register-modal.css
   Styles for the Tier 2 registration modal.
   Per D-022 (progressive depth) + D-023 (registration entry).
   ============================================================

   STRUCTURE
     .dusn-register-backdrop   – dims the feed; click closes
     .dusn-register-modal      – centered card
       .dusn-register-header   – title + close button
       .dusn-register-body     – scrollable form area
         .dusn-register-roles  – three role-option cards
         .dusn-register-field  – label + input pairs
         .dusn-register-legal  – versioned legal acknowledgment
       .dusn-register-footer   – submit button + error region

   All colors come from /ui/dusn/tokens.css.
   ============================================================ */

/* ── Backdrop ─────────────────────────────────────────────── */
.dusn-register-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(45, 63, 62, 0.45);  /* tinted by --text */
  z-index: 1000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  padding: 48px 16px;
  animation: dusn-fade-in 160ms ease-out;
}
.dusn-register-backdrop.visible {
  display: flex;
}

@keyframes dusn-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── Modal card ───────────────────────────────────────────── */
.dusn-register-modal {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 48px rgba(45, 63, 62, 0.18);
  animation: dusn-modal-in 180ms ease-out;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 96px);
}

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

/* ── Header ───────────────────────────────────────────────── */
.dusn-register-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 12px;
  border-bottom: 1px solid var(--border2);
}
.dusn-register-title {
  font-family: 'Syne', sans-serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.dusn-register-close {
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  color: var(--text3);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 120ms, color 120ms;
}
.dusn-register-close:hover {
  background: var(--bg3);
  color: var(--text);
}

/* ── Body (scrollable) ────────────────────────────────────── */
.dusn-register-body {
  padding: 16px 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Role chooser ─────────────────────────────────────────── */
.dusn-register-roles-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.dusn-register-roles {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.dusn-register-role {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  cursor: pointer;
  transition: border-color 120ms, background 120ms;
}
.dusn-register-role:hover {
  border-color: var(--sage-mid);
}
.dusn-register-role.selected {
  border-color: var(--accent);
  background: var(--accent-light);
}
.dusn-register-role input[type="radio"] {
  margin-top: 2px;
  accent-color: var(--accent);
}
.dusn-register-role-text {
  flex: 1;
}
.dusn-register-role-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  display: block;
  margin-bottom: 2px;
}
.dusn-register-role-desc {
  font-size: 12px;
  color: var(--text3);
  line-height: 1.4;
}

/* ── Fields ───────────────────────────────────────────────── */
.dusn-register-field {
  display: flex;
  flex-direction: column;
}
.dusn-register-field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.dusn-register-field input,
.dusn-register-field select {
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg2);
  color: var(--text);
  transition: border-color 120ms;
}
.dusn-register-field input:focus,
.dusn-register-field select:focus {
  outline: none;
  border-color: var(--accent);
}
.dusn-register-hint {
  font-size: 11px;
  color: var(--text3);
  margin-top: 4px;
}

/* ── Region row (country + subdivision, per D-029) ────────── */
.dusn-register-region {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 480px) {
  .dusn-register-region {
    grid-template-columns: 1fr;
  }
}

/* ── Legal acknowledgment ─────────────────────────────────── */
.dusn-register-legal {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  background: var(--bg3);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text2);
  line-height: 1.5;
}
.dusn-register-legal input[type="checkbox"] {
  margin-top: 2px;
  accent-color: var(--accent);
  flex-shrink: 0;
}
.dusn-register-legal-version {
  display: block;
  margin-top: 6px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
}

/* ── Error message ────────────────────────────────────────── */
.dusn-register-error {
  display: none;
  padding: 10px 12px;
  background: var(--fail-light);
  border: 1px solid var(--fail);
  border-radius: 6px;
  color: var(--fail);
  font-size: 13px;
  line-height: 1.4;
}
.dusn-register-error.visible {
  display: block;
}

/* ── Footer ───────────────────────────────────────────────── */
.dusn-register-footer {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border2);
}
.dusn-register-submit {
  width: 100%;
  padding: 12px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms, opacity 120ms;
}
.dusn-register-submit:hover:not(:disabled) {
  background: #8a7a6a;  /* slightly darker accent */
}
.dusn-register-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}