:root {
  --bg: #f7f5f2;
  --bg-grid: rgba(180, 120, 80, 0.04);
  --surface: #fffcfa;
  --surface-alt: #f3f0ec;
  --surface-elevated: #ffffff;
  --border: #e8e4df;
  --border-strong: #d6d0c8;
  --text: #1c1917;
  --text-secondary: #44403c;
  --muted: #78716c;
  --primary: #c45c26;
  --primary-light: #ea580c;
  --primary-soft: #fff7ed;
  --primary-glow: rgba(234, 88, 12, 0.18);
  --tech: #0f766e;
  --tech-soft: #ecfdf5;
  --tech-glow: rgba(15, 118, 110, 0.12);
  --success: #15803d;
  --success-soft: #f0fdf4;
  --warn: #b45309;
  --warn-soft: #fffbeb;
  --danger-soft: #fef2f2;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow: 0 4px 16px rgba(28, 25, 23, 0.06);
  --font: "Plus Jakarta Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "Cascadia Code", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  padding-left: max(1rem, env(safe-area-inset-left));
  padding-right: max(1rem, env(safe-area-inset-right));
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
}

header {
  margin-bottom: 1.5rem;
  padding: 1.25rem 1rem 1.35rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  position: relative;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--primary-light),
    var(--tech),
    var(--primary-light)
  );
  background-size: 200% 100%;
}

header h1 {
  font-size: clamp(1.28rem, 4.5vw, 1.55rem);
  font-weight: 700;
  margin: 0.15rem 0 0.35rem;
  color: var(--text);
  letter-spacing: -0.03em;
}

.platform-tag {
  display: inline-block;
  margin: 0 0 0.35rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid #fed7aa;
  border-radius: 4px;
}

header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 500;
  max-width: 28rem;
  margin-inline: auto;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.btn-sm {
  font-size: 0.78rem;
  padding: 0.4rem 0.75rem;
}

.btn-outline {
  background: var(--surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
}

.btn-outline:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  background: var(--primary-soft);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(28, 25, 23, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  padding-top: max(1rem, env(safe-area-inset-top));
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

.modal-panel {
  width: 100%;
  max-width: 520px;
  max-height: min(85vh, 640px);
  background: var(--surface-elevated);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.btn-close {
  width: 2rem;
  height: 2rem;
  border: none;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
}

.btn-close:hover {
  color: var(--text);
  background: var(--border);
}

.modal-body {
  padding: 1rem 1.1rem 1.15rem;
  overflow-y: auto;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.rules-body h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  margin: 1rem 0 0.4rem;
}

.rules-body h3:first-of-type {
  margin-top: 0.5rem;
}

.rules-body ul {
  margin: 0;
  padding-left: 1.15rem;
}

.rules-body li {
  margin-bottom: 0.35rem;
  line-height: 1.5;
}

.rules-tag {
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.65rem;
  background: var(--tech-soft);
  border-radius: var(--radius-sm);
  border: 1px solid #99f6e4;
  font-size: 0.8rem;
}

.disclaimer {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.55;
}

.disclaimer p {
  margin: 0 0 0.5rem;
}

.disclaimer p:last-child {
  margin-bottom: 0;
}

.disclaimer strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.grid-2 {
  display: grid;
  gap: 1rem;
}

@media (min-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

section.card {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

section.card h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0 0 0.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
}

section.card .hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 0.9rem;
  line-height: 1.5;
}

.badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
  background: var(--surface-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  letter-spacing: 0.02em;
}

.badge-stack {
  background: var(--tech-soft);
  color: var(--tech);
  border-color: #99f6e4;
}

.card-group .group-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.2rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.card-platform {
  position: relative;
  border-left: none;
  padding-left: 1.2rem;
}

.card-platform::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  bottom: 1rem;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--primary-light), var(--tech));
}

.inner-grid {
  margin-top: 0.65rem;
}

.sub-block {
  padding: 0.85rem;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.sub-block h3 {
  font-size: 0.84rem;
  font-weight: 600;
  margin: 0 0 0.6rem;
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.item-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.table-header {
  display: grid;
  gap: 0.45rem;
  align-items: end;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#threshold-list .table-header,
#threshold-list .item-row,
#platform-threshold-list .table-header,
#platform-threshold-list .item-row {
  grid-template-columns: 1fr minmax(5rem, 6.5rem) minmax(5rem, 6.5rem) 2.25rem;
}

#member-list .table-header,
#member-list .item-row,
#platform-member-list .table-header,
#platform-member-list .item-row {
  grid-template-columns: 1fr minmax(5.5rem, 7rem) 2.25rem;
}

#dish-list .table-header,
#dish-list .item-row {
  grid-template-columns: 1fr minmax(7rem, 8.5rem) minmax(7rem, 8.5rem) 2.25rem;
}

#promo-list .table-header,
#promo-list .item-row {
  grid-template-columns: 1fr 5.5rem 4.5rem 4.5rem 3.5rem 2.25rem;
}

.item-row,
.table-header {
  display: grid;
  gap: 0.45rem;
  align-items: center;
}

.field-wrap .field-label {
  display: none;
}

.field-wrap--full .field-hint {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.2rem;
  line-height: 1.45;
}

input,
select {
  font-family: inherit;
  font-size: 0.875rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-elevated);
  color: var(--text);
  width: 100%;
  min-width: 0;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

input:disabled {
  background: var(--surface-alt);
  color: var(--muted);
  cursor: not-allowed;
}

label.chk {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

label.chk input {
  width: auto;
  accent-color: var(--primary);
}

.stepper-controls {
  display: flex;
  align-items: stretch;
  gap: 0.35rem;
}

.stepper-controls input {
  flex: 1;
  min-width: 3rem;
  text-align: center;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  font-size: 0.9rem;
}

.btn-step {
  flex-shrink: 0;
  width: 2.35rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-elevated);
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn-step:hover {
  background: var(--primary-soft);
  border-color: var(--primary-light);
  color: var(--primary);
}

.btn-step:active {
  transform: scale(0.97);
}

.btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
  color: #fff;
  width: 100%;
  padding: 0.72rem 1.25rem;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.btn-primary:hover {
  box-shadow: 0 4px 14px var(--primary-glow);
  filter: brightness(1.05);
}

.btn-secondary {
  background: var(--surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background: var(--surface-alt);
  border-color: var(--primary-light);
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  padding: 0.35rem 0.25rem;
  font-size: 0.82rem;
  margin-top: 0.35rem;
}

.btn-ghost:hover {
  color: var(--primary-light);
}

.btn-remove {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1;
  justify-self: center;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.btn-remove:hover {
  color: #b91c1c;
  border-color: #fecaca;
  background: var(--danger-soft);
}

.original-total-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.6rem;
  margin-top: 0.85rem;
  padding: 0.8rem 1rem;
  background: var(--warn-soft);
  border-radius: var(--radius-sm);
  border: 1px solid #fde68a;
  font-size: 0.875rem;
}

.original-total-bar strong {
  font-size: 1.28rem;
  color: var(--warn);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
}

.original-total-bar > span:not(.sub) {
  margin-right: 0.25rem;
}

.original-total-bar .sub {
  font-size: 0.75rem;
  color: var(--muted);
  width: 100%;
}

.actions-bar {
  margin-top: 0.85rem;
}

.result-cards {
  display: grid;
  gap: 0.65rem;
}

@media (min-width: 700px) {
  .result-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.result-card.best {
  border-color: var(--success);
  background: var(--success-soft);
  box-shadow: 0 0 0 1px rgba(21, 128, 61, 0.15), var(--shadow-sm);
}

.result-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.result-card.best h3 {
  color: var(--success);
}

.result-card .price-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
}

.result-card .price {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  letter-spacing: -0.02em;
}

.result-card .original-line {
  font-size: 0.8rem;
  color: var(--muted);
}

.result-card .original-line strong {
  color: var(--muted);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  text-decoration: line-through;
  text-decoration-color: var(--border-strong);
}

.result-card .saved {
  font-size: 0.78rem;
  color: var(--success);
  font-weight: 600;
  margin-top: 0.25rem;
}

.summary-banner {
  background: var(--success-soft);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 0.85rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.summary-banner strong {
  color: var(--success);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.fees-form .field-wrap .field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.fees-form {
  margin-top: 0.25rem;
}

.original-total-bar .sub strong {
  color: var(--primary);
  font-weight: 700;
}

.compare-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.compare-strip-3 {
  grid-template-columns: repeat(3, 1fr);
}

.compare-strip .box {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem;
  text-align: center;
}

.compare-strip .box.pay {
  border-color: #fed7aa;
  background: var(--primary-soft);
}

.compare-strip .box .label {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 0.25rem;
  letter-spacing: 0.03em;
}

.compare-strip .box .val {
  font-size: 1.22rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  letter-spacing: -0.02em;
}

.compare-strip .box.original .val {
  color: var(--text-secondary);
}

.compare-strip .box.pay .val {
  color: var(--primary);
}

.detail-block h4 {
  margin: 0.75rem 0 0.4rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.order-detail {
  background: var(--surface-elevated);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.8rem;
  margin-bottom: 0.45rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary-light);
}

.order-detail .line {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.order-detail .fee-line {
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

.order-detail .pay-line {
  margin-top: 0.35rem;
  font-weight: 700;
  color: var(--text);
}

.order-detail .line span:last-child {
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  font-size: 0.8rem;
}

.order-detail .discounts {
  color: var(--success);
  font-size: 0.76rem;
  margin-top: 0.25rem;
  font-weight: 500;
}

.partition-list {
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
  background: var(--surface-alt);
}

.partition-list div {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

.partition-list div:last-child {
  border-bottom: none;
}

.export-area textarea {
  width: 100%;
  min-height: 200px;
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  color: var(--text);
  line-height: 1.55;
}

.export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.empty-hint {
  text-align: center;
  color: var(--muted);
  padding: 1.5rem 0.5rem;
  font-size: 0.875rem;
}

.warn-inline {
  font-size: 0.78rem;
  color: var(--warn);
}

@media (max-width: 768px) {
  .table-header {
    display: none;
  }

  .field-wrap .field-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 0.2rem;
    letter-spacing: 0.02em;
  }

  #threshold-list .item-row,
  #member-list .item-row,
  #platform-threshold-list .item-row,
  #platform-member-list .item-row,
  #dish-list .item-row,
  #promo-list .item-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 0.7rem;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
  }

  .sub-block {
    padding: 0.75rem;
  }

  .card-platform {
    padding-left: 1rem;
  }

  .card-platform::before {
    top: 0.75rem;
    bottom: 0.75rem;
  }

  .item-row .btn-remove {
    justify-self: end;
    margin-top: 0.1rem;
  }

  #promo-list label.chk {
    padding-top: 0.1rem;
  }

  .compare-strip,
  .compare-strip-3 {
    grid-template-columns: 1fr;
  }

  .result-card .price-row {
    flex-direction: column;
    gap: 0.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  header::before {
    background-size: 100% 100%;
  }

  .btn,
  .btn-step,
  .result-card {
    transition: none;
  }
}