/* ========================================================================
   SONOLINK — components.css
   Buttons · Cards · Mode grid · Fields · PIN · Settings sheet · Role badges
   ======================================================================== */

/* ========== Buttons ========== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: transform 120ms ease, background 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg-deep);
  border-color: transparent;
  box-shadow: 0 4px 20px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  font-weight: 700;
}

.btn--primary:not(:disabled):hover {
  box-shadow: 0 6px 28px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border);
}

.btn--ghost:hover {
  background: var(--surface);
  border-color: var(--border-strong);
}

.btn--danger {
  background: transparent;
  border-color: rgba(255, 107, 107, 0.3);
  color: #ff6b6b;
}

.btn--danger:hover {
  background: rgba(255, 107, 107, 0.08);
  border-color: rgba(255, 107, 107, 0.5);
}

.btn--full { width: 100%; }

/* Icon button */
.icon-btn {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: color 200ms ease, border-color 200ms ease, transform 120ms ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-btn:active { transform: scale(0.95); }

/* ========== Mode Grid ========== */

.mode-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 16px 20px;
  overflow-y: auto;
  flex: 1;
}

@media (min-width: 560px) {
  .mode-grid { grid-template-columns: 1fr 1fr; }
}

.mode-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  cursor: pointer;
  transition: transform 180ms ease, border-color 200ms ease, background 200ms ease, box-shadow 200ms ease;
  overflow: hidden;
  min-height: 130px;
  text-align: right;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  background: radial-gradient(circle, var(--card-accent, var(--accent-soft)), transparent 70%);
  opacity: 0.6;
  pointer-events: none;
}

.mode-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 4px; height: 100%;
  background: var(--card-color, var(--accent));
  opacity: 0.7;
  box-shadow: 0 0 12px var(--card-color, var(--accent));
}

.mode-card:active { transform: scale(0.98); }
.mode-card:hover { border-color: var(--card-color, var(--border-strong)); }

.mode-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.mode-card__icon {
  width: 38px; height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--card-accent, var(--accent-soft));
  color: var(--card-color, var(--accent));
  font-size: 1.1rem;
  border: 1px solid var(--card-color, var(--border));
}

.mode-card__lock {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-dim);
  letter-spacing: 0.1em;
  border: 1px solid var(--border);
}

.mode-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.mode-card__sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  color: var(--card-color, var(--accent));
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.9;
}

.mode-card__desc {
  font-size: 0.8125rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* ========== Form fields ========== */

.form-stack {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 20px;
  overflow-y: auto;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.field__input {
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 1rem;
  color: var(--text);
  transition: border-color 200ms ease, background 200ms ease;
}

.field__input::placeholder { color: var(--text-faint); }
.field__input:focus { border-color: var(--accent); background: var(--surface-2); }

.field__hint {
  font-size: 0.75rem;
  color: var(--text-faint);
}

/* ID preview */
.id-preview {
  padding: 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.id-preview__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
}

.id-preview__value {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.15em;
  word-break: break-all;
}

.id-preview__hint {
  font-size: 0.7rem;
  color: var(--text-faint);
}

/* ========== Role badge ========== */

.role-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.875rem;
  align-self: flex-start;
}

.role-badge__icon {
  font-size: 1rem;
  line-height: 1;
}

.role-badge--inline {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

/* ========== PIN keypad ========== */

.pin-stack {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  padding: 24px 20px;
  overflow-y: auto;
}

.pin-warning {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 209, 102, 0.08);
  border: 1px solid rgba(255, 209, 102, 0.3);
  color: #ffd166;
  font-size: 0.75rem;
  font-weight: 600;
}

.pin-warning__icon { font-size: 0.875rem; }

.pin-display {
  display: flex;
  gap: 10px;
  margin: 8px 0;
}

.pin-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--border-strong);
  background: transparent;
  transition: background 200ms ease, border-color 200ms ease, transform 120ms ease;
}

.pin-dot.filled {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  transform: scale(1.1);
}

.pin-display.error .pin-dot {
  border-color: var(--danger);
  background: var(--danger);
}

.pin-status {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  min-height: 20px;
}

.pin-keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 320px;
}

.pin-key {
  height: 64px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text);
  transition: transform 100ms ease, background 200ms ease, border-color 200ms ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pin-key:active {
  transform: scale(0.94);
  background: var(--surface-2);
  border-color: var(--accent);
}

.pin-key--ghost {
  color: var(--text-dim);
  font-size: 1.25rem;
}

/* ========== Settings sheet ========== */

.sheet {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.sheet[hidden] { display: none; }

.sheet__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 200ms ease;
}

.sheet__panel {
  position: relative;
  width: 100%;
  max-width: 560px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom: none;
  border-top-left-radius: 24px;
  border-top-right-radius: 24px;
  padding: 16px 20px calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  max-height: 80vh;
  overflow-y: auto;
  animation: slideUp 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.sheet__handle {
  width: 40px;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  margin: 0 auto 8px;
}

.sheet__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 4px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}

.setting-row:last-of-type { border-bottom: none; }

/* Switch */
.switch { position: relative; display: inline-block; width: 48px; height: 28px; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }

.switch__track {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: 999px;
  transition: background 200ms ease;
  cursor: pointer;
}

.switch__track::before {
  content: '';
  position: absolute;
  top: 3px;
  right: 3px;
  width: 22px;
  height: 22px;
  background: #fff;
  border-radius: 50%;
  transition: transform 200ms cubic-bezier(0.22, 1, 0.36, 1);
}

.switch input:checked + .switch__track {
  background: var(--accent);
}

.switch input:checked + .switch__track::before {
  transform: translateX(-20px);
}

/* ========== App placeholder (Phase 1 end) ========== */

.app-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px;
  text-align: center;
}

.app-placeholder__title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.125rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.app-placeholder__user {
  display: flex;
  gap: 6px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.app-placeholder__name { color: var(--accent); }

.app-placeholder__hint {
  font-size: 0.8125rem;
  color: var(--text-dim);
  max-width: 320px;
  line-height: 1.6;
}

.app-placeholder__id {
  font-size: 0.75rem;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  margin-top: 8px;
}