/* ============================================================
   Bread Units Calculator — Style Sheet
   ============================================================ */

/* ── Custom Properties ──────────────────────────────────── */
.buc-app {
  --buc-primary:       #2563eb;
  --buc-primary-light: color-mix(in srgb, var(--buc-primary) 12%, transparent);
  --buc-primary-dark:  color-mix(in srgb, var(--buc-primary) 80%, #000);

  /* Light theme (default) */
  --buc-bg:            #f1f5f9;
  --buc-surface:       #ffffff;
  --buc-surface2:      #f8fafc;
  --buc-text:          #0f172a;
  --buc-text2:         #475569;
  --buc-text3:         #94a3b8;
  --buc-border:        #e2e8f0;
  --buc-shadow:        0 4px 20px rgba(0,0,0,.08);
  --buc-radius:        12px;
  --buc-radius-sm:     8px;
  --buc-success:       #10b981;
  --buc-danger:        #ef4444;
  --buc-warn-bg:       #fef9c3;
  --buc-warn-border:   #fde047;
  --buc-warn-text:     #713f12;
}

.buc-app.buc-dark {
  --buc-bg:            #0f172a;
  --buc-surface:       #1e293b;
  --buc-surface2:      #152032;
  --buc-text:          #f1f5f9;
  --buc-text2:         #94a3b8;
  --buc-text3:         #64748b;
  --buc-border:        #334155;
  --buc-shadow:        0 4px 20px rgba(0,0,0,.4);
  --buc-warn-bg:       #1c1a08;
  --buc-warn-border:   #78630a;
  --buc-warn-text:     #fde68a;
}

/* ── Base ────────────────────────────────────────────────── */
.buc-app *,
.buc-app *::before,
.buc-app *::after { box-sizing: border-box; }

.buc-app {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--buc-text);
  background: transparent;
}

.buc-wrap {
  max-width: 780px;
  margin: 0 auto;
  background: var(--buc-bg);
  border-radius: var(--buc-radius);
  overflow: hidden;
  box-shadow: var(--buc-shadow);
}

/* ── Header ─────────────────────────────────────────────── */
.buc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 22px 16px;
  background: var(--buc-surface);
  border-bottom: 1px solid var(--buc-border);
}

.buc-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.buc-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.buc-logo-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--buc-primary-light);
  color: var(--buc-primary);
  font-weight: 800;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.buc-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--buc-text);
}

/* HE toggle */
.buc-he-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--buc-surface2);
  border: 1px solid var(--buc-border);
  border-radius: 20px;
  padding: 3px 3px 3px 8px;
}

.buc-he-label {
  font-size: 12px;
  color: var(--buc-text2);
  white-space: nowrap;
}

.buc-pill-btn {
  border: none;
  background: transparent;
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--buc-text2);
  transition: all .2s;
  line-height: 1.6;
}

.buc-pill-btn.active {
  background: var(--buc-primary);
  color: #fff;
}

.buc-pill-btn:not(.active):hover {
  background: var(--buc-border);
  color: var(--buc-text);
}

/* Icon button */
.buc-icon-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--buc-border);
  background: var(--buc-surface2);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background .2s;
}

.buc-icon-btn:hover {
  background: var(--buc-primary-light);
}

/* ── Tabs ────────────────────────────────────────────────── */
.buc-tabs {
  display: flex;
  background: var(--buc-surface);
  border-bottom: 1px solid var(--buc-border);
  overflow-x: auto;
  scrollbar-width: none;
}

.buc-tabs::-webkit-scrollbar { display: none; }

.buc-tab-btn {
  flex: 1;
  min-width: 80px;
  padding: 12px 8px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--buc-text2);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  border-bottom: 3px solid transparent;
  transition: all .2s;
  white-space: nowrap;
}

.buc-tab-btn:hover {
  color: var(--buc-primary);
  background: var(--buc-primary-light);
}

.buc-tab-btn.active {
  color: var(--buc-primary);
  border-bottom-color: var(--buc-primary);
  background: var(--buc-primary-light);
}

.buc-tab-icon { font-size: 18px; }
.buc-tab-text { font-size: 11px; }

/* ── Panel ───────────────────────────────────────────────── */
.buc-panel {
  padding: 24px 22px;
}

/* ── Sections ────────────────────────────────────────────── */
.buc-section {
  background: var(--buc-surface);
  border: 1px solid var(--buc-border);
  border-radius: var(--buc-radius);
  padding: 18px;
  margin-bottom: 16px;
}

.buc-section-title {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--buc-text2);
}

/* ── Form elements ───────────────────────────────────────── */
.buc-label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--buc-text);
}

.buc-hint {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--buc-text3);
}

.buc-input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--buc-border);
  border-radius: var(--buc-radius-sm);
  background: var(--buc-surface);
  color: var(--buc-text);
  font-size: 14px;
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}

.buc-input:focus {
  border-color: var(--buc-primary);
  box-shadow: 0 0 0 3px var(--buc-primary-light);
}

.buc-input-group {
  display: flex;
  align-items: center;
}

.buc-input-group .buc-input {
  border-radius: var(--buc-radius-sm) 0 0 var(--buc-radius-sm);
  border-right: none;
}

.buc-input-suffix {
  padding: 9px 12px;
  border: 1px solid var(--buc-border);
  border-left: none;
  border-radius: 0 var(--buc-radius-sm) var(--buc-radius-sm) 0;
  background: var(--buc-surface2);
  color: var(--buc-text2);
  font-size: 13px;
  white-space: nowrap;
}

.buc-form-row {
  margin-bottom: 16px;
}

.buc-form-row:last-child { margin-bottom: 0; }

/* Mode toggle */
.buc-mode-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}

.buc-mode-btn {
  padding: 6px 14px;
  border: 1px solid var(--buc-border);
  border-radius: 20px;
  background: var(--buc-surface2);
  color: var(--buc-text2);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}

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

/* Weight control */
.buc-weight-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.buc-slider {
  flex: 1;
  -webkit-appearance: none;
  height: 5px;
  border-radius: 3px;
  background: var(--buc-border);
  outline: none;
  cursor: pointer;
}

.buc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--buc-primary);
  cursor: pointer;
}

.buc-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--buc-primary);
  border: none;
  cursor: pointer;
}

.buc-weight-input-wrap {
  width: 110px;
  flex-shrink: 0;
}

/* ── Search / Autocomplete ───────────────────────────────── */
.buc-search-wrap {
  position: relative;
}

.buc-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--buc-surface);
  border: 1px solid var(--buc-border);
  border-radius: var(--buc-radius-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
  z-index: 9999;
  max-height: 280px;
  overflow-y: auto;
}

.buc-dd-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--buc-border);
  transition: background .15s;
  gap: 8px;
}

.buc-dd-item:last-child { border-bottom: none; }
.buc-dd-item:hover { background: var(--buc-primary-light); }

.buc-dd-name {
  font-size: 14px;
  color: var(--buc-text);
  font-weight: 500;
}

.buc-dd-meta {
  font-size: 12px;
  color: var(--buc-text3);
  text-align: right;
  flex-shrink: 0;
}

.buc-dd-empty {
  padding: 14px;
  text-align: center;
  color: var(--buc-text3);
  font-size: 13px;
}

/* Selected product tag */
.buc-selected-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--buc-primary-light);
  border: 1px solid var(--buc-primary);
  border-radius: var(--buc-radius-sm);
}

.buc-selected-tag-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--buc-primary);
  flex: 1;
}

.buc-selected-tag-info {
  font-size: 12px;
  color: var(--buc-text2);
}

.buc-clear-btn {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--buc-text3);
  font-size: 14px;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background .15s;
}

.buc-clear-btn:hover { background: var(--buc-border); color: var(--buc-danger); }

/* Custom product fields */
.buc-custom-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 8px;
}

@media (max-width: 480px) {
  .buc-custom-fields { grid-template-columns: 1fr; }
}

/* ── Buttons ─────────────────────────────────────────────── */
.buc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: none;
  border-radius: var(--buc-radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  line-height: 1.4;
}

.buc-btn-primary {
  background: var(--buc-primary);
  color: #fff;
  width: 100%;
  margin-top: 4px;
}

.buc-btn-primary:hover { filter: brightness(1.1); }

.buc-btn-outline {
  background: transparent;
  color: var(--buc-primary);
  border: 1.5px solid var(--buc-primary);
}

.buc-btn-outline:hover { background: var(--buc-primary-light); }

.buc-btn-ghost {
  background: var(--buc-surface2);
  color: var(--buc-text2);
  border: 1px solid var(--buc-border);
}

.buc-btn-ghost:hover { background: var(--buc-border); }

.buc-btn-danger {
  background: transparent;
  color: var(--buc-danger);
  border: 1.5px solid var(--buc-danger);
}

.buc-btn-danger:hover { background: #fef2f2; }

.buc-btn-sm { padding: 7px 12px; font-size: 13px; }

.buc-btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

/* ── Result Card ─────────────────────────────────────────── */
.buc-result-card {
  background: linear-gradient(135deg, var(--buc-primary), var(--buc-primary-dark));
  border-radius: var(--buc-radius);
  padding: 20px;
  margin-top: 16px;
  color: #fff;
  box-shadow: 0 4px 16px color-mix(in srgb, var(--buc-primary) 40%, transparent);
}

.buc-result-main {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 16px;
}

.buc-result-value {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
}

.buc-result-unit {
  font-size: 20px;
  font-weight: 600;
  opacity: .85;
}

.buc-result-product {
  font-size: 14px;
  opacity: .8;
  margin-top: 2px;
}

.buc-result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  background: rgba(255,255,255,.12);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 14px;
}

.buc-rg-item { text-align: center; }
.buc-rg-val { font-size: 18px; font-weight: 700; display: block; }
.buc-rg-lbl { font-size: 11px; opacity: .75; }

.buc-result-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.buc-result-actions .buc-btn {
  flex: 1;
  background: rgba(255,255,255,.18);
  color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  font-size: 12px;
  padding: 7px 10px;
}

.buc-result-actions .buc-btn:hover { background: rgba(255,255,255,.28); }

/* ── Meal Table ──────────────────────────────────────────── */
.buc-meal-add-row {
  display: flex;
  gap: 10px;
}

.buc-meal-add-row .buc-search-wrap { flex: 1; }

.buc-table-wrap {
  overflow-x: auto;
  margin-bottom: 16px;
}

.buc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.buc-table th {
  padding: 9px 10px;
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--buc-text2);
  border-bottom: 2px solid var(--buc-border);
  background: var(--buc-surface2);
  white-space: nowrap;
}

.buc-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--buc-border);
  color: var(--buc-text);
  vertical-align: middle;
}

.buc-table tr:hover td { background: var(--buc-primary-light); }

.buc-table tfoot td {
  padding: 10px;
  font-weight: 700;
  border-top: 2px solid var(--buc-border);
  border-bottom: none;
  background: var(--buc-surface2);
}

.buc-table .buc-he-cell {
  color: var(--buc-primary);
  font-weight: 700;
}

.buc-weight-inline {
  width: 75px;
  padding: 5px 8px;
  font-size: 13px;
}

.buc-remove-btn {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--buc-text3);
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all .15s;
}

.buc-remove-btn:hover { background: #fef2f2; color: var(--buc-danger); }

/* Meal summary cards */
.buc-summary-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

.buc-summary-card {
  background: var(--buc-surface);
  border: 1px solid var(--buc-border);
  border-radius: var(--buc-radius-sm);
  padding: 14px;
  text-align: center;
}

.buc-sc-val {
  font-size: 26px;
  font-weight: 800;
  color: var(--buc-primary);
  line-height: 1;
  display: block;
}

.buc-sc-lbl {
  font-size: 11px;
  color: var(--buc-text3);
  margin-top: 4px;
  display: block;
}

/* ── Insulin ─────────────────────────────────────────────── */
.buc-info-box {
  background: var(--buc-warn-bg);
  border: 1px solid var(--buc-warn-border);
  border-radius: var(--buc-radius-sm);
  color: var(--buc-warn-text);
  padding: 12px 14px;
  font-size: 13px;
  margin-bottom: 16px;
  line-height: 1.5;
}

.buc-insulin-result {
  background: linear-gradient(135deg, #059669, #047857);
  border-radius: var(--buc-radius);
  padding: 22px;
  color: #fff;
  margin: 0 0 16px;
  text-align: center;
}

.buc-insulin-result .buc-result-value { font-size: 52px; color: #fff; }
.buc-insulin-result .buc-result-unit  { font-size: 20px; color: rgba(255,255,255,.85); }

.buc-dose-formula {
  margin-top: 10px;
  font-size: 13px;
  opacity: .75;
  font-family: monospace;
  letter-spacing: .3px;
}

/* ── History ─────────────────────────────────────────────── */
.buc-history-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 14px;
}

.buc-hist-list { display: flex; flex-direction: column; gap: 8px; }

.buc-hist-item {
  background: var(--buc-surface);
  border: 1px solid var(--buc-border);
  border-radius: var(--buc-radius-sm);
  padding: 12px 14px;
  transition: box-shadow .2s;
}

.buc-hist-item:hover { box-shadow: var(--buc-shadow); }

.buc-hist-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.buc-hist-date {
  font-size: 12px;
  color: var(--buc-text3);
}

.buc-hist-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 20px;
  flex-shrink: 0;
}

.buc-hist-badge.quick   { background: #dbeafe; color: #1d4ed8; }
.buc-hist-badge.meal    { background: #dcfce7; color: #15803d; }
.buc-hist-badge.insulin { background: #fce7f3; color: #be185d; }

.buc-hist-badge.buc-dark.quick   { background: #1e3a5f; color: #93c5fd; }
.buc-hist-badge.buc-dark.meal    { background: #14532d; color: #86efac; }
.buc-hist-badge.buc-dark.insulin { background: #4a1942; color: #f9a8d4; }

.buc-hist-spacer { flex: 1; }

.buc-hist-body { display: flex; align-items: baseline; gap: 8px; }

.buc-hist-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--buc-text);
  flex: 1;
}

.buc-hist-he {
  font-size: 16px;
  font-weight: 800;
  color: var(--buc-primary);
  white-space: nowrap;
}

.buc-hist-details {
  font-size: 12px;
  color: var(--buc-text3);
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* ── Empty State ─────────────────────────────────────────── */
.buc-empty {
  text-align: center;
  padding: 36px 16px;
  color: var(--buc-text3);
}

.buc-empty-icon { font-size: 42px; margin-bottom: 10px; }
.buc-empty-text { font-size: 14px; }

/* ── Toast ───────────────────────────────────────────────── */
.buc-toast {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: #1e293b;
  color: #f1f5f9;
  padding: 9px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: all .25s;
  pointer-events: none;
  z-index: 10000;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
}

.buc-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.buc-toast.error { background: #7f1d1d; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 580px) {
  .buc-panel { padding: 16px 14px; }
  .buc-header { padding: 14px 16px; }
  .buc-result-grid { grid-template-columns: repeat(3,1fr); }
  .buc-summary-row { grid-template-columns: repeat(3,1fr); }
  .buc-result-value { font-size: 38px; }
  .buc-title { font-size: 14px; }
}

@media (max-width: 420px) {
  .buc-summary-row { grid-template-columns: repeat(2, 1fr); }
  .buc-result-grid { grid-template-columns: 1fr 1fr; }
}