:root {
  --receipt-bg: #faf8f5;
  --receipt-border: #2c2c2c;
  --text-primary: #1a1a1a;
  --text-muted: #555;
  --accent: #c45c3e;
  --paper-shadow: rgba(0,0,0,0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'IBM Plex Mono', monospace;
  background: linear-gradient(135deg, #e8e4df 0%, #d4cfc8 100%);
  min-height: 100vh;
  min-height: 100dvh;
  padding: clamp(1rem, 4vw, 2rem) clamp(0.75rem, 3vw, 1.5rem);
  padding-bottom: calc(clamp(1rem, 4vw, 2rem) + env(safe-area-inset-bottom, 0px));
  color: var(--text-primary);
}

.container {
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.input-section {
  background: white;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 20px var(--paper-shadow);
  margin-bottom: 1.5rem;
}

.input-group {
  margin-bottom: 1rem;
}

.input-group:last-child {
  margin-bottom: 0;
}

.stats-picker {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}

.stats-picker-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.category-list {
  max-height: min(520px, 55vh);
  min-height: 280px;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.35rem 0;
  -webkit-overflow-scrolling: touch;
}

.category-block {
  margin-bottom: 1.25rem;
}

.category-block:last-child {
  margin-bottom: 0;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.85rem;
  min-height: 44px;
  font-size: clamp(0.8rem, 2.2vw, 0.9rem);
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px;
  background: linear-gradient(135deg, #f5f3f0 0%, #ebe8e4 100%);
  border: 1px solid #e0ddd8;
  margin-bottom: 0.6rem;
  transition: all 0.2s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.category-header:hover {
  background: linear-gradient(135deg, #ebe8e4 0%, #e0ddd8 100%);
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(196, 92, 62, 0.15);
}

.category-header:active {
  transform: scale(0.99);
}

.category-header .category-emoji {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.category-header .category-count {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  flex-shrink: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
  padding-left: 0.35rem;
}

.stats-grid label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: clamp(0.7rem, 2vw, 0.78rem);
  cursor: pointer;
  margin-bottom: 0;
  min-height: 28px;
  padding: 0.15rem 0;
}

.stats-grid input[type="checkbox"] {
  width: 18px;
  height: 18px;
  min-width: 18px;
  min-height: 18px;
  cursor: pointer;
  accent-color: var(--text-primary);
  flex-shrink: 0;
}

.stats-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.stats-actions button {
  padding: 0.35rem 0.6rem;
  font-size: 0.7rem;
  font-family: 'IBM Plex Mono', monospace;
  background: transparent;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted);
}

.stats-actions button:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

/* Receipt category headers */
.receipt-category {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed #ccc;
}

.receipt-category:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.receipt-category-title {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.2em;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  letter-spacing: 0.05em;
}

input[type="date"],
input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: var(--receipt-bg);
}

input[type="date"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  width: 100%;
  padding: 0.85rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn-primary {
  background: var(--text-primary);
  color: white;
  margin-top: 1rem;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--text-primary);
  margin-top: 0.75rem;
}

.btn-secondary:hover {
  background: var(--text-primary);
  color: white;
}

/* Receipt */
.receipt-wrapper {
  display: none;
  margin-top: 1.5rem;
}

.receipt-wrapper.visible {
  display: block;
}

.receipt {
  background: var(--receipt-bg);
  border: 2px solid var(--receipt-border);
  padding: 2rem 1.75rem;
  font-size: 0.8rem;
  line-height: 1.6;
  position: relative;
  box-shadow: 0 8px 32px var(--paper-shadow);
}

.receipt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 8px,
    var(--receipt-border) 8px,
    var(--receipt-border) 10px
  );
}

.receipt-header {
  text-align: center;
  border-bottom: 1px dashed var(--receipt-border);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.receipt-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.25rem;
  font-weight: 400;
}

.receipt-name {
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 0.5rem;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.receipt-subtitle {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  letter-spacing: 0.15em;
}

.receipt-date {
  font-size: 0.7rem;
  margin-top: 0.5rem;
  color: var(--text-muted);
}

.receipt-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.4rem 0;
  border-bottom: 1px dotted #ccc;
  gap: 1rem;
}

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

.receipt-label {
  flex-shrink: 0;
  color: var(--text-muted);
}

.receipt-dots {
  flex: 1;
  border-bottom: 1px dotted #999;
  margin: 0 0.25rem;
  min-width: 20px;
}

.receipt-value {
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.receipt-footer {
  text-align: center;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--receipt-border);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.receipt-footer-sub {
  font-size: 0.55rem;
  margin-top: 0.35rem;
  letter-spacing: 0.15em;
  opacity: 0.9;
}

.error-message {
  color: #c45c3e;
  font-size: 0.8rem;
  margin-top: 0.5rem;
  display: none;
}

.error-message.visible {
  display: block;
}

.page-footer {
  text-align: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.page-footer a {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.2s;
}

.page-footer a:hover {
  color: var(--accent);
}

/* Responsive: tablets and below */
@media (max-width: 768px) {
  .category-list {
    max-height: min(480px, 50vh);
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Responsive: phones */
@media (max-width: 480px) {
  .input-section {
    padding: 1.25rem;
  }

  .category-list {
    max-height: min(420px, 45vh);
    min-height: 240px;
  }

  .category-header {
    padding: 0.65rem 0.75rem;
    min-height: 48px;
    font-size: 0.85rem;
  }

  .category-header .category-count {
    font-size: 0.65rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .stats-grid label {
    min-height: 36px;
    font-size: 0.8rem;
  }

  .stats-grid input[type="checkbox"] {
    width: 20px;
    height: 20px;
    min-width: 20px;
    min-height: 20px;
  }

  .receipt {
    padding: 1.5rem 1.25rem;
    font-size: 0.75rem;
  }

  .receipt-value {
    font-size: 0.7rem;
  }

  .btn {
    padding: 0.9rem;
    min-height: 48px;
  }
}

/* Responsive: very small phones */
@media (max-width: 360px) {
  .category-list {
    max-height: min(380px, 40vh);
  }

  .category-header {
    font-size: 0.8rem;
  }

  .category-header .category-count {
    display: none;
  }
}

/* Landscape phones - give more height to categories */
@media (max-height: 500px) and (orientation: landscape) {
  .category-list {
    max-height: 280px;
    min-height: 200px;
  }
}