:root {
  --bg:       var(--tg-theme-bg-color, #0f1117);
  --bg2:      var(--tg-theme-secondary-bg-color, #1a1d27);
  --text:     var(--tg-theme-text-color, #e8eaf0);
  --hint:     var(--tg-theme-hint-color, #8a8fa8);
  --link:     var(--tg-theme-link-color, #4caf7d);
  --btn:      var(--tg-theme-button-color, #4caf7d);
  --btn-text: var(--tg-theme-button-text-color, #ffffff);
  --danger:   #e05555;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 16px;
  padding-bottom: 90px;
}

h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--hint);
  text-transform: uppercase;
  letter-spacing: .5px;
}

/* Категории */
.categories {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 20px;
}
.cat-btn {
  background: var(--bg2);
  border: 2px solid transparent;
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  padding: 12px 10px;
  text-align: left;
  transition: border-color .15s, background .15s;
  line-height: 1.3;
}
.cat-btn:active { opacity: .7; }
.cat-btn.active {
  border-color: var(--btn);
  background: color-mix(in srgb, var(--btn) 15%, var(--bg2));
}

/* Ввод */
.input-group { margin-bottom: 20px; }
.input-label {
  font-size: 13px;
  color: var(--hint);
  margin-bottom: 8px;
}
.price-input {
  width: 100%;
  background: var(--bg2);
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
  outline: none;
  padding: 14px 16px;
  transition: border-color .15s;
}
.price-input:focus { border-color: var(--btn); }
.price-input::placeholder { color: var(--hint); font-weight: 400; font-size: 15px; }

/* Результат */
.result { display: none; }
.result.show { display: block; }

.total-block {
  background: color-mix(in srgb, var(--btn) 15%, var(--bg2));
  border: 1px solid color-mix(in srgb, var(--btn) 40%, transparent);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 12px;
  text-align: center;
}
.total-label { font-size: 13px; color: var(--hint); margin-bottom: 4px; }
.total-value { font-size: 32px; font-weight: 800; color: var(--btn); }

.details {
  background: var(--bg2);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
}
.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 13px 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--hint) 20%, transparent);
  font-size: 14px;
}
.detail-row:last-child { border-bottom: none; }
.detail-row .lbl { color: var(--hint); }
.detail-row .val { font-weight: 600; }

.info-box {
  background: var(--bg2);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--hint);
  line-height: 1.6;
  margin-bottom: 12px;
}

/* Кнопки под расчётом */
.calc-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}
.action-btn {
  flex: 1;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  padding: 13px 10px;
  transition: opacity .15s;
}
.action-btn:active { opacity: .7; }
.btn-add-cart {
  background: var(--btn);
  color: var(--btn-text);
}
.btn-recalc {
  background: var(--bg2);
  color: var(--link);
}

/* ───── Корзина ───── */
.cart-section { display: none; }
.cart-section.show { display: block; }

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.cart-header h2 { margin-bottom: 0; }
.cart-count-badge {
  background: var(--btn);
  color: var(--btn-text);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 9px;
}

.cart-items {
  background: var(--bg2);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
}
.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--hint) 20%, transparent);
  gap: 8px;
}
.cart-item:last-child { border-bottom: none; }
.cart-item-info { flex: 1; min-width: 0; }
.cart-item-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cart-item-price {
  font-size: 12px;
  color: var(--hint);
  margin-top: 2px;
}
.cart-item-cost {
  font-size: 14px;
  font-weight: 700;
  color: var(--btn);
  white-space: nowrap;
}
.cart-item-del {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 6px;
  flex-shrink: 0;
}
.cart-item-del:active { opacity: .6; }

.cart-total-block {
  background: color-mix(in srgb, var(--btn) 12%, var(--bg2));
  border: 1px solid color-mix(in srgb, var(--btn) 30%, transparent);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 12px;
}
.cart-total-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 4px 0;
  color: var(--hint);
}
.cart-total-row.main-total {
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
  border-top: 1px solid color-mix(in srgb, var(--hint) 20%, transparent);
  margin-top: 8px;
  padding-top: 10px;
}
.cart-total-row .val { font-weight: 600; color: var(--text); }
.cart-total-row.main-total .val { color: var(--btn); }

.discount-hint {
  background: color-mix(in srgb, #f5a623 15%, var(--bg2));
  border: 1px solid color-mix(in srgb, #f5a623 40%, transparent);
  border-radius: 10px;
  color: #f5a623;
  font-size: 13px;
  padding: 10px 14px;
  margin-bottom: 12px;
  line-height: 1.5;
}
.discount-hint.hidden { display: none; }

.cart-clear-btn {
  width: 100%;
  background: none;
  border: 1px solid color-mix(in srgb, var(--danger) 50%, transparent);
  border-radius: 10px;
  color: var(--danger);
  cursor: pointer;
  font-size: 14px;
  padding: 11px;
  margin-bottom: 20px;
}
.cart-clear-btn:active { opacity: .7; }

.section { margin-bottom: 20px; }