:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1f2328;
  --color-text-sub: #57606a;
  --color-border: #e4e7eb;
  --color-accent: #2b7a78;
  --color-accent-dark: #205e5c;
  --color-danger: #c62828;
  --color-food: #6aa84f;
  --color-nonfood: #3c78d8;
  --radius: 12px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --tap-min: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1115;
    --color-surface: #1a1d23;
    --color-text: #e6edf3;
    --color-text-sub: #9aa4af;
    --color-border: #2a2f37;
    --color-accent: #4cbfbb;
    --color-accent-dark: #2b7a78;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: calc(var(--tap-min) + var(--space-4) + env(safe-area-inset-bottom));
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  padding-top: calc(var(--space-3) + env(safe-area-inset-top));
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-accent);
}

.month-switch select {
  min-height: var(--tap-min);
  padding: 0 var(--space-3);
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}

.month-switch select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Main */
.app-main {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.section-heading {
  margin: 0 0 var(--space-3);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-sub);
  letter-spacing: 0.04em;
}

/* Summary */
.summary-section {
  text-align: center;
  padding: var(--space-5) var(--space-4);
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.summary-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-sub);
  letter-spacing: 0.05em;
}

.summary-total {
  margin: var(--space-2) 0 var(--space-3);
  font-size: clamp(2rem, 10vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.summary-breakdown {
  display: flex;
  justify-content: center;
  gap: var(--space-5);
  font-size: 0.9rem;
  color: var(--color-text-sub);
  flex-wrap: wrap;
}

.summary-breakdown b {
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  margin-left: var(--space-1);
}

.summary-food::before,
.summary-nonfood::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: var(--space-2);
  vertical-align: middle;
}

.summary-food::before { background-color: var(--color-food); }
.summary-nonfood::before { background-color: var(--color-nonfood); }

/* Charts */
.charts-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.chart-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
}

.chart-title {
  margin: 0 0 var(--space-3);
  font-size: 1rem;
  font-weight: 600;
}

.chart-wrapper {
  position: relative;
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}

.chart-center {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}

.legend {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.legend li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.9rem;
}

.legend-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  flex-shrink: 0;
}

.legend-name {
  flex: 1;
}

.legend-amount {
  font-variant-numeric: tabular-nums;
  color: var(--color-text-sub);
}

.chart-empty {
  text-align: center;
  color: var(--color-text-sub);
  padding: var(--space-5) 0;
  font-size: 0.9rem;
}

/* List */
.list-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.view-tabs {
  display: flex;
  gap: var(--space-2);
  background-color: var(--color-surface);
  padding: var(--space-1);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.tab-btn {
  flex: 1;
  min-height: var(--tap-min);
  padding: var(--space-2) var(--space-3);
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 500;
  color: var(--color-text-sub);
  background: transparent;
  border: none;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  transition: background-color 0.15s;
}

.tab-btn.is-active {
  background-color: var(--color-accent);
  color: #fff;
}

.tab-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.list-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.item-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
}

.item-name {
  grid-column: 1;
  grid-row: 1;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.item-amount {
  grid-column: 2;
  grid-row: 1;
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.item-meta {
  grid-column: 1 / 3;
  grid-row: 2;
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
  font-size: 0.8rem;
  color: var(--color-text-sub);
}

.category-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 999px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
}

.category-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--badge-color, var(--color-text-sub));
}

.receipt-group {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.receipt-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: color-mix(in srgb, var(--color-accent) 8%, transparent);
  border-bottom: 1px solid var(--color-border);
}

.receipt-meta {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.receipt-total {
  font-size: 1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.receipt-items {
  list-style: none;
  margin: 0;
  padding: 0;
}

.receipt-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

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

.receipt-item-name {
  flex: 1;
  font-size: 0.95rem;
}

.receipt-item-amount {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.empty-state {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--color-text-sub);
  background-color: var(--color-surface);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

/* Footer / actions */
.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom));
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  max-width: 720px;
  margin: 0 auto;
}

.btn {
  flex: 1;
  min-height: var(--tap-min);
  padding: 0 var(--space-3);
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: background-color 0.15s, transform 0.05s;
}

.btn:active {
  transform: scale(0.98);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
}

.btn-danger {
  color: var(--color-danger);
  border-color: color-mix(in srgb, var(--color-danger) 30%, var(--color-border));
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(72px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  max-width: calc(100% - 32px);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-text);
  color: var(--color-surface);
  border-radius: var(--radius);
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 100;
  animation: toast-in 0.2s ease-out;
}

@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

/* Header actions (settings icon) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  width: var(--tap-min);
  height: var(--tap-min);
  min-width: var(--tap-min);
  padding: 0;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--color-text);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background-color: var(--color-bg);
  border-color: var(--color-border);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Modal */
.modal-container {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.modal-container[hidden] {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.45);
}

.modal-body {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - env(safe-area-inset-top));
  background-color: var(--color-surface);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: var(--space-4);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  animation: modal-in 0.2s ease-out;
}

@keyframes modal-in {
  from { transform: translateY(16px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

@media (min-width: 600px) {
  .modal-container {
    align-items: center;
  }
  .modal-body {
    border-radius: var(--radius);
    max-height: calc(100vh - 64px);
  }
}

.modal-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
}

.modal-label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: 0.9rem;
  color: var(--color-text-sub);
}

.modal-label input {
  min-height: var(--tap-min);
  padding: 0 var(--space-3);
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.modal-label input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.modal-help {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-sub);
  line-height: 1.5;
}

.modal-warning {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font-size: 0.85rem;
  color: var(--color-danger);
  background-color: color-mix(in srgb, var(--color-danger) 10%, transparent);
  border-radius: var(--radius);
}

.modal-footer {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
  margin-top: var(--space-2);
}

.modal-footer .btn {
  flex: 0 1 auto;
  min-width: 80px;
}

.modal-loading {
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.preview-image {
  width: 100%;
  max-height: 60vh;
  object-fit: contain;
  background-color: var(--color-bg);
  border-radius: var(--radius);
}

/* Review UI */
.modal-review {
  gap: var(--space-3);
}

.review-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.review-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.8rem;
  color: var(--color-text-sub);
}

.review-label input {
  min-height: var(--tap-min);
  padding: 0 var(--space-3);
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.review-receiptid {
  margin: 0;
  font-size: 0.75rem;
  color: var(--color-text-sub);
  font-variant-numeric: tabular-nums;
}

.review-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.review-row {
  display: grid;
  grid-template-columns: 1fr 90px 36px;
  grid-template-rows: auto auto;
  grid-template-areas:
    "name amount delete"
    "category category category";
  gap: var(--space-1) var(--space-2);
  padding: var(--space-2);
  background-color: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.review-row.is-lowconf {
  background-color: color-mix(in srgb, var(--color-danger) 8%, var(--color-bg));
  border-color: color-mix(in srgb, var(--color-danger) 30%, var(--color-border));
}

.review-name {
  grid-area: name;
}

.review-amount {
  grid-area: amount;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.review-select {
  grid-area: category;
}

.review-delete {
  grid-area: delete;
}

.review-input,
.review-select {
  min-height: var(--tap-min);
  padding: 0 var(--space-2);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: calc(var(--radius) - 4px);
}

.review-input:focus-visible,
.review-select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.review-delete {
  min-height: var(--tap-min);
  width: 36px;
  padding: 0;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--color-danger);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
}

.review-delete:hover {
  background-color: color-mix(in srgb, var(--color-danger) 10%, transparent);
  border-color: color-mix(in srgb, var(--color-danger) 30%, var(--color-border));
}

@media (min-width: 600px) {
  .review-row {
    grid-template-columns: 1fr 110px 160px 36px;
    grid-template-rows: auto;
    grid-template-areas: "name amount category delete";
  }
}