/* ── Custom properties ─────────────────────────────────────────────────────── */
:root {
  --color-primary: #6b21a8;      /* grape purple */
  --color-primary-light: #9333ea;
  --color-primary-dark: #4c1d95;
  --color-accent: #c084fc;
  --color-bg: #faf5ff;
  --color-surface: #ffffff;
  --color-border: #e9d5ff;
  --color-text: #1e1b4b;
  --color-text-muted: #6b7280;
  --color-error: #dc2626;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;

  --radius: 12px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 6px rgba(0,0,0,.07), 0 10px 15px rgba(0,0,0,.05);

  --tap-target: 44px;
  --spacing: 16px;
  --max-width: 640px;

  --z-spinner: 100;
  --z-toast: 200;
  --z-modal: 300;
  --z-fab: 50;
}

/* ── Reset ──────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100%;
  line-height: 1.5;
}

img { max-width: 100%; height: auto; display: block; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.view {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  /* safe area insets for iPhone notch / home bar */
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.view[hidden] { display: none !important; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

/* ── Top bar ────────────────────────────────────────────────────────────────── */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--spacing);
  padding-top: env(safe-area-inset-top, 0);
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: calc(var(--tap-target) + env(safe-area-inset-top, 0));
}

.top-bar__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  flex: 1;
}

.top-bar__back {
  min-width: var(--tap-target);
  min-height: var(--tap-target);
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--tap-target);
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: opacity .15s, transform .1s;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: .5; pointer-events: none; }

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-light); }

.btn--secondary {
  background: var(--color-border);
  color: var(--color-primary-dark);
}

.btn--danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  padding: 0 8px;
}

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

/* FAB */
.fab {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom, 0));
  right: 24px;
  z-index: var(--z-fab);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.75rem;
  line-height: 1;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.fab:hover { background: var(--color-primary-light); }

/* ── Tabs ───────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 24px;
}

.tab {
  flex: 1;
  min-height: var(--tap-target);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color .15s, border-color .15s;
}

.tab--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ── Auth view ──────────────────────────────────────────────────────────────── */
#view-auth {
  justify-content: center;
  padding: var(--spacing);
}

.auth-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 32px var(--spacing);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}

.auth-logo {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 8px;
}

.auth-notice {
  background: var(--color-border);
  color: var(--color-primary-dark);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 12px;
}

.auth-tagline {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.error-message {
  color: var(--color-error);
  font-size: 0.875rem;
  min-height: 1.25em;
  margin-bottom: 8px;
}

/* ── Forms ──────────────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.form-input,
.form-textarea,
.form-select {
  display: block;
  width: 100%;
  min-height: var(--tap-target);
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color .15s;
  -webkit-appearance: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

.amount-row {
  display: flex;
  gap: 8px;
}

.amount-row .form-input { flex: 1; }
.amount-row .form-select { width: 80px; }

/* Regret slider */
.regret-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.regret-slider {
  flex: 1;
  -webkit-appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
}

.regret-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
}

.regret-label {
  font-size: 1.1rem;
  min-width: 60px;
  color: var(--color-primary-dark);
}

/* Photo section */
.photo-section {
  margin-bottom: 16px;
}

.photo-preview {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.photo-buttons {
  display: flex;
  gap: 8px;
}

.photo-buttons .btn { flex: 1; }

/* Hidden file inputs */
.input-camera,
.input-library {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ── Purchase list ──────────────────────────────────────────────────────────── */
#view-list .scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing);
  padding-bottom: calc(80px + env(safe-area-inset-bottom, 0));
}

.purchase-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow .15s, transform .1s;
}

.purchase-card:active { transform: scale(0.99); }
.purchase-card:hover { box-shadow: var(--shadow-lg); }

.purchase-card .card-photo {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.purchase-card .card-title {
  font-size: 1.05rem;
  font-weight: 600;
  padding: 12px 16px 4px;
}

.purchase-card .card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 16px 12px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.card-stars { color: #d97706; }
.card-amount { font-weight: 600; color: var(--color-text); }

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 64px var(--spacing);
  gap: 12px;
}

.empty-state__icon { font-size: 3rem; }
.empty-state__text { color: var(--color-text-muted); }

/* ── Item form view ─────────────────────────────────────────────────────────── */
#view-item-form .scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing);
  padding-bottom: calc(80px + env(safe-area-inset-bottom, 0));
}

.form-actions {
  position: sticky;
  bottom: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 12px var(--spacing);
  padding-bottom: calc(12px + env(safe-area-inset-bottom, 0));
  display: flex;
  gap: 8px;
}

/* ── Share management ───────────────────────────────────────────────────────── */
#view-share-manage .scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing);
}

.share-token-row {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow);
}

.token-label { flex: 1; font-weight: 600; }

/* ── Shared view ────────────────────────────────────────────────────────────── */
.shared-guest-cta {
  margin: 24px var(--spacing);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing);
  text-align: center;
}

.shared-guest-cta p {
  margin-bottom: 12px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ── Friends view ────────────────────────────────────────────────────────────── */
.friend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px var(--spacing);
  border-bottom: 1px solid var(--color-border);
}

.friend-name {
  flex: 1;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 4px 0;
  min-height: var(--tap-target);
  display: flex;
  align-items: center;
}

.friend-remove {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.shared-banner {
  background: var(--color-primary);
  color: #fff;
  padding: 16px var(--spacing);
  text-align: center;
  font-weight: 600;
}

#view-shared .scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing);
}

.shared-cta {
  margin-top: 24px;
  text-align: center;
  padding: var(--spacing);
  color: var(--color-text-muted);
}

.shared-cta a {
  color: var(--color-primary);
  font-weight: 600;
}

/* ── Toast ──────────────────────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom, 0));
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  width: calc(100% - 2 * var(--spacing));
  max-width: 400px;
}

.toast {
  background: var(--color-text);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .25s, transform .25s;
  width: 100%;
  text-align: center;
}

.toast--visible { opacity: 1; transform: translateY(0); }
.toast--success { background: var(--color-success); }
.toast--error { background: var(--color-error); }

/* ── Spinner ────────────────────────────────────────────────────────────────── */
#spinner {
  position: fixed;
  inset: 0;
  z-index: var(--z-spinner);
  background: rgba(255,255,255,.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* display:flex on parent/self has higher specificity than [hidden]{display:none} — override explicitly */
#spinner[hidden],
#btn-delete[hidden],
#btn-save-friend[hidden],
#btn-back-shared[hidden] {
  display: none;
}

#spinner::after {
  content: '';
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

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

/* ── Confirm modal ──────────────────────────────────────────────────────────── */
#confirm-modal {
  border: none;
  border-radius: var(--radius);
  padding: 24px var(--spacing);
  box-shadow: var(--shadow-lg);
  max-width: 320px;
  width: calc(100% - 2 * var(--spacing));
  z-index: var(--z-modal);
}

#confirm-modal::backdrop {
  background: rgba(0,0,0,.4);
}

.confirm-message {
  margin-bottom: 20px;
  line-height: 1.5;
}

.confirm-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ── Detail modal ───────────────────────────────────────────────────────────── */
#detail-modal {
  border: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 20px var(--spacing) calc(20px + env(safe-area-inset-bottom));
  box-shadow: var(--shadow-lg);
  max-width: var(--max-width);
  width: 100%;
  margin: auto auto 0;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  z-index: var(--z-modal);
}

#detail-modal::backdrop {
  background: rgba(0,0,0,.45);
}

.detail-modal__close {
  position: absolute;
  top: 12px;
  right: var(--spacing);
  font-size: 1.1rem;
  line-height: 1;
  padding: 4px 8px;
}

.detail-modal__photo {
  width: 100%;
  border-radius: var(--radius);
  margin-bottom: 16px;
  max-height: 260px;
  object-fit: cover;
  display: block;
}

.detail-modal__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 10px;
  padding-right: 32px; /* avoid overlap with close button */
}

.detail-modal__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.detail-modal__desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  white-space: pre-wrap;
  margin: 0;
}

/* ── Module navigation ──────────────────────────────────────────────────────── */
.module-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  gap: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  z-index: 10;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.module-tab {
  flex: 1;
  min-height: var(--tap-target);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.module-tab:active,
.module-tab:hover {
  background: rgba(107, 33, 168, 0.05);
}

.module-tab--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Add padding to views to clear module nav */
.view {
  padding-bottom: calc(56px + env(safe-area-inset-bottom, 0));
}

.view-auth {
  padding-bottom: 0;
}

/* ── Desktop layout ─────────────────────────────────────────────────────────── */
@media (min-width: 640px) {
  .auth-card { padding: 40px; }

  .view { max-width: var(--max-width); margin: 0 auto; }

  .top-bar { border-left: 1px solid var(--color-border); border-right: 1px solid var(--color-border); }
}