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

:root {
  --blue:       #2563eb;
  --blue-dark:  #1d4ed8;
  --green:      #16a34a;
  --green-dark: #15803d;
  --red:        #dc2626;
  --red-dark:   #b91c1c;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-300:   #cbd5e1;
  --gray-400:   #94a3b8;
  --gray-500:   #64748b;
  --gray-600:   #475569;
  --gray-700:   #334155;
  --gray-800:   #1e293b;
  --gray-900:   #0f172a;
  --radius:     12px;
  --radius-sm:  8px;
  --shadow:     0 1px 3px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --header-h:   56px;
  --fab-size:   56px;
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.5;
  min-height: 100dvh;
  overscroll-behavior: none;
}

#app {
  max-width: 600px;
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--blue);
  color: #fff;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(37,99,235,.35);
}

.app-header h1 {
  font-size: 1.125rem;
  font-weight: 600;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-icon {
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .15s;
}

.btn-icon:hover { background: rgba(255,255,255,.15); }
.btn-icon svg { width: 22px; height: 22px; }
.header-actions { display: flex; gap: 4px; }

/* ── Views ──────────────────────────────────────────────────────────────── */
.view {
  display: none;
  flex: 1;
  padding: 16px;
  padding-bottom: calc(var(--fab-size) + 32px);
  overflow-y: auto;
}

.view.active { display: block; }

/* ── Utility ─────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.mt-1 { margin-top: 6px; }
.text-muted { color: var(--gray-500); font-size: .875rem; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  font-size: .9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  text-decoration: none;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.btn-lg { padding: 14px 24px; font-size: 1rem; border-radius: var(--radius); }
.btn-block { width: 100%; }

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

.btn-success { background: var(--green); color: #fff; }
.btn-success:hover { background: var(--green-dark); }

.btn-outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}
.btn-outline:hover { background: var(--gray-100); }

.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { background: var(--red-dark); }

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 60px 24px;
  text-align: center;
  color: var(--gray-500);
}

.empty-icon { font-size: 3rem; line-height: 1; }

/* ── Receipt Grid / Cards ────────────────────────────────────────────────── */
.receipt-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.receipt-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 12px;
  align-items: start;
  transition: box-shadow .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}

.receipt-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.receipt-card:active { transform: translateY(0); }

.card-vendor {
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-800);
  grid-column: 1;
  grid-row: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-total {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--blue);
  grid-column: 2;
  grid-row: 1;
  text-align: right;
  white-space: nowrap;
}

.card-meta {
  font-size: .8125rem;
  color: var(--gray-500);
  grid-column: 1;
  grid-row: 2;
}

.card-badge {
  grid-column: 2;
  grid-row: 2;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: .72rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-blue   { background: #dbeafe; color: #1e40af; }
.badge-green  { background: #dcfce7; color: #166534; }
.badge-amber  { background: #fef3c7; color: #92400e; }
.badge-purple { background: #ede9fe; color: #5b21b6; }
.badge-gray   { background: #f1f5f9; color: #475569; }
.badge-red    { background: #fee2e2; color: #991b1b; }

/* ── Capture View ────────────────────────────────────────────────────────── */
.capture-area {
  background: #fff;
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: 16px;
}

.capture-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px;
  text-align: center;
  color: var(--gray-500);
}

.capture-icon { font-size: 3.5rem; line-height: 1; }

.capture-preview {
  width: 100%;
  max-height: 60dvh;
  object-fit: contain;
  display: block;
}

.capture-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.ocr-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius);
  color: var(--gray-600);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

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

/* ── Form ────────────────────────────────────────────────────────────────── */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-size: .8125rem;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .9375rem;
  color: var(--gray-800);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
  -webkit-appearance: none;
  appearance: none;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

input::placeholder,
textarea::placeholder {
  color: var(--gray-400);
  opacity: 1;
}

textarea { resize: vertical; min-height: 72px; }

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

/* ── Amounts card ────────────────────────────────────────────────────────── */
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.amounts-card { margin-bottom: 12px; }

.amounts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.input-prefix {
  position: relative;
  display: flex;
  align-items: center;
}

.currency-prefix {
  position: absolute;
  left: 10px;
  color: var(--gray-400);
  font-size: .9375rem;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

.input-prefix input { padding-left: 22px; }
.input-prefix.total-input input { padding-left: 26px; font-size: 1.125rem; font-weight: 700; }
.total-prefix { font-size: 1rem; font-weight: 700; color: var(--gray-500); }

.total-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1.5px solid var(--gray-100);
}

.total-row label {
  font-size: .875rem;
  font-weight: 700;
  color: var(--gray-700);
  text-transform: uppercase;
  letter-spacing: .04em;
  flex-shrink: 0;
  white-space: nowrap;
}

.total-row .input-prefix { flex: 1; }

/* ── Form image ──────────────────────────────────────────────────────────── */
.form-image-wrap {
  text-align: center;
  margin-bottom: 14px;
}

.form-image-thumb {
  max-height: 180px;
  max-width: 100%;
  border-radius: var(--radius-sm);
  object-fit: contain;
  box-shadow: var(--shadow-md);
}

/* ── Form actions ────────────────────────────────────────────────────────── */
.form-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 4px;
}

/* ── Summary view ────────────────────────────────────────────────────────── */
.summary-filters {
  margin-bottom: 14px;
}

.summary-filters select {
  max-width: 200px;
}

.summary-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.summary-stat {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  text-align: center;
}

.summary-stat .stat-value {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--blue);
}

.summary-stat .stat-label {
  font-size: .78rem;
  color: var(--gray-500);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.summary-breakdown h3 {
  font-size: .875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-500);
  margin-bottom: 10px;
}

.summary-row {
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}

.summary-row .cat-name { font-weight: 600; font-size: .9375rem; }
.summary-row .cat-amount { font-weight: 700; color: var(--blue); }
.summary-row .cat-count { font-size: .8125rem; color: var(--gray-500); }

/* ── FAB ─────────────────────────────────────────────────────────────────── */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: var(--fab-size);
  height: var(--fab-size);
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37,99,235,.45);
  transition: background .15s, transform .1s, box-shadow .15s;
  z-index: 200;
  -webkit-tap-highlight-color: transparent;
}

.fab svg { width: 26px; height: 26px; }
.fab:hover { background: var(--blue-dark); box-shadow: 0 6px 18px rgba(37,99,235,.5); }
.fab:active { transform: scale(.94); }

/* ── Toast ───────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: calc(var(--fab-size) + 36px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--gray-800);
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: .9rem;
  font-weight: 500;
  z-index: 300;
  box-shadow: var(--shadow-md);
  max-width: calc(100vw - 48px);
  text-align: center;
  pointer-events: none;
  transition: opacity .2s;
}

.toast.error { background: var(--red); }

/* ── Confirm dialog ──────────────────────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 400;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 0 env(safe-area-inset-bottom, 0);
}

.overlay.hidden { display: none !important; }

.confirm-dialog {
  background: #fff;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 24px 20px 28px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 -4px 20px rgba(0,0,0,.12);
}

.confirm-dialog p {
  font-size: 1rem;
  color: var(--gray-700);
  margin-bottom: 20px;
  text-align: center;
}

.confirm-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ── Auth screen ─────────────────────────────────────────────────────────── */
.auth-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--gray-50);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  overflow-y: auto;
}

.auth-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 32px 24px 28px;
  width: 100%;
  max-width: 400px;
}

.auth-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  text-align: center;
}

.auth-brand-icon  { font-size: 2.5rem; line-height: 1; }
.auth-brand-title { font-size: 1.25rem; font-weight: 700; color: var(--gray-800); margin: 0; }

.auth-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--gray-100);
  margin-bottom: 20px;
}

.auth-tab {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  padding: 10px 0;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--gray-500);
  cursor: pointer;
  transition: color .15s, border-color .15s;
}

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

.auth-form { display: flex; flex-direction: column; gap: 12px; }

.auth-error {
  color: var(--red);
  font-size: .875rem;
  background: #fee2e2;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin: 0;
}

.label-optional { font-weight: 400; color: var(--gray-400); font-size: .8125rem; }

/* ── User pill (header) ───────────────────────────────────────────────────── */
.user-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px 3px 3px;
  border-radius: 999px;
  background: var(--gray-100);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: .6875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: .03em;
}

.user-logout {
  background: none;
  border: none;
  cursor: pointer;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  border-radius: 50%;
  transition: background .15s, color .15s;
  -webkit-tap-highlight-color: transparent;
}

.user-logout svg     { width: 15px; height: 15px; }
.user-logout:hover   { background: var(--gray-200); color: var(--red); }

/* ── Activity List ───────────────────────────────────────────────────────── */
.activity-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.activity-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: box-shadow .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}

.activity-card:hover  { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.activity-card:active { transform: translateY(0); }

.activity-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.activity-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-800);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.activity-desc-preview {
  font-size: .8125rem;
  color: var(--gray-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.activity-card-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  flex-shrink: 0;
}

.activity-count { font-size: .8rem; color: var(--gray-500); }
.activity-spend { font-size: .875rem; font-weight: 600; color: var(--blue); }
.activity-chevron { width: 16px; height: 16px; color: var(--gray-400); margin-top: 4px; }

/* ── Activity Detail ─────────────────────────────────────────────────────── */
.activity-header-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.activity-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.activity-detail-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.3;
}

.activity-detail-desc {
  font-size: .875rem;
  color: var(--gray-500);
  margin-top: 2px;
}

.activity-header-btns {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.btn-icon-sm {
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  transition: background .15s, color .15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-icon-sm svg        { width: 18px; height: 18px; }
.btn-icon-sm:hover      { background: var(--gray-100); color: var(--gray-700); }
.btn-icon-danger        { color: var(--red); }
.btn-icon-danger:hover  { background: #fee2e2; color: var(--red-dark); }

.activity-detail-stats {
  display: flex;
  gap: 16px;
}

.activity-stat {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.activity-stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue);
}

.activity-stat-label {
  font-size: .75rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.activity-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.activity-actions .btn {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  font-size: .875rem;
  white-space: nowrap;
}

/* ── Activity / Confirm modals ───────────────────────────────────────────── */
.activity-modal-dialog {
  padding-top: 20px;
}

.modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 16px;
}

/* ── Picker modal ────────────────────────────────────────────────────────── */
.picker-dialog {
  background: #fff;
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 80dvh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -4px 20px rgba(0,0,0,.12);
}

.picker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 12px;
  border-bottom: 1px solid var(--gray-100);
  flex-shrink: 0;
}

.picker-list {
  overflow-y: auto;
  padding: 8px 16px 24px;
  flex: 1;
  -webkit-overflow-scrolling: touch;
}

.picker-empty {
  text-align: center;
  color: var(--gray-500);
  padding: 24px 0;
  font-size: .9rem;
}

.picker-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
}

.picker-item:last-child { border-bottom: none; }

.picker-item-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.picker-vendor { font-weight: 600; font-size: .9375rem; color: var(--gray-800); }
.picker-meta   { font-size: .8125rem; color: var(--gray-500); }

.picker-current-activity {
  font-size: .75rem;
  color: var(--blue);
  font-style: italic;
}

.btn-sm {
  padding: 6px 14px;
  font-size: .8125rem;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 400px) {
  .amounts-grid { grid-template-columns: 1fr; }
  .summary-cards { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --gray-50:  #0f172a;
    --gray-100: #1e293b;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748b;
    --gray-500: #94a3b8;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-800: #f1f5f9;
    --gray-900: #f8fafc;
  }

  .auth-screen   { background: #0f172a; }
  .auth-card     { background: #1e293b; }
  .auth-tabs     { border-color: #334155; }

  .user-pill     { background: #334155; }
  .user-logout:hover { background: #450a0a; }

  .receipt-card,
  .card,
  .capture-area,
  .summary-stat,
  .summary-row,
  .confirm-dialog,
  .activity-card,
  .activity-header-card,
  .picker-dialog,
  input, select, textarea { background: #1e293b; }

  .capture-area   { border-color: #334155; }
  .picker-header  { border-color: #334155; }
  .picker-item    { border-color: #334155; }

  .activity-name,
  .activity-detail-name { color: var(--gray-800); }

  .btn-icon-sm:hover         { background: #334155; }
  .btn-icon-danger:hover     { background: #450a0a; }

  input::placeholder,
  textarea::placeholder {
    color: var(--gray-500);
  }
}