/* ============================================
   CarbCal — Design System & Styles
   Mobile-first, responsive, premium design
   ============================================ */

/* ---------- Google Font ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors — Light Mode */
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8eef4;
  --bg-input: #f7f9fc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;

  --accent-blue: #3b82f6;
  --accent-blue-light: #dbeafe;
  --accent-blue-dark: #1d4ed8;
  --accent-amber: #f59e0b;
  --accent-amber-light: #fef3c7;
  --accent-green: #10b981;
  --accent-green-light: #d1fae5;
  --accent-red: #ef4444;
  --accent-red-light: #fee2e2;
  --accent-purple: #8b5cf6;

  --gradient-hero: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #6366f1 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));
  --gradient-total: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.05);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.3);

  --border-color: #e2e8f0;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  --border-radius-full: 9999px;

  --nav-height: 64px;
  --header-height: 56px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-smooth: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Dark Mode ---------- */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-input: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f172a;

  --accent-blue-light: rgba(59, 130, 246, 0.15);
  --accent-amber-light: rgba(245, 158, 11, 0.15);
  --accent-green-light: rgba(16, 185, 129, 0.15);
  --accent-red-light: rgba(239, 68, 68, 0.15);

  --gradient-card: linear-gradient(135deg, rgba(30,41,59,0.95), rgba(30,41,59,0.8));

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.2);

  --border-color: #334155;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

input, button, select {
  font-family: inherit;
  font-size: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

/* ---------- App Shell ---------- */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 100%;
  position: relative;
}

/* ---------- Header ---------- */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.app-logo {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.header-subtitle {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Theme toggle - SVEN style */
.theme-toggle {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.theme-toggle:active {
  transform: scale(0.92);
}

.theme-toggle-icon {
  font-size: 1.1rem;
  line-height: 1;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
}

#lang-toggle {
  padding: 6px 12px;
  border-radius: var(--border-radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 36px;
}

#lang-toggle:hover {
  background: var(--accent-blue-light);
  color: var(--accent-blue);
}

#lang-toggle:active {
  transform: scale(0.95);
}

/* ---------- Total Carbs Display ---------- */
#total-display {
  background: var(--gradient-total);
  margin: 12px 16px 0;
  padding: 20px 24px;
  border-radius: var(--border-radius-lg);
  color: white;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-smooth);
}

#total-display::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 200px;
  height: 200px;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
  pointer-events: none;
}

#total-display::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 120px;
  height: 120px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
  pointer-events: none;
}

.total-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.total-label {
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.total-meal-label {
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.7;
  background: rgba(255,255,255,0.15);
  padding: 3px 10px;
  border-radius: var(--border-radius-full);
}

.total-value-container {
  display: flex;
  align-items: baseline;
  gap: 6px;
  position: relative;
  z-index: 1;
}

#total-value {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
  transition: all var(--transition-normal);
}

.total-unit {
  font-size: 1.2rem;
  font-weight: 600;
  opacity: 0.8;
}

.total-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  position: relative;
  z-index: 1;
}

#copy-total {
  padding: 8px 20px;
  border-radius: var(--border-radius-full);
  background: rgba(255,255,255,0.2);
  color: white;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
}

#copy-total:hover {
  background: rgba(255,255,255,0.3);
}

#copy-total:active {
  transform: scale(0.95);
}

.items-count {
  font-size: 0.75rem;
  opacity: 0.7;
  padding: 8px 0 0;
  position: relative;
  z-index: 1;
}

/* ---------- Main Content ---------- */
#main-content {
  flex: 1;
  padding-bottom: calc(var(--nav-height) + 80px);
}

/* ---------- Views ---------- */
.view {
  display: none;
  padding: 12px 16px;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Search ---------- */
#search-container {
  position: relative;
  margin-bottom: 12px;
}

#food-search {
  width: 100%;
  padding: 14px 16px 14px 44px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  outline: none;
}

#food-search:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-light);
}

#food-search::placeholder {
  color: var(--text-tertiary);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-tertiary);
  pointer-events: none;
  z-index: 2;
}

.search-clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-tertiary);
  padding: 4px;
  display: none;
  z-index: 2;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
}

.search-clear.visible {
  display: flex;
}

.search-clear:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* ---------- Search Results Dropdown ---------- */
#search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 360px;
  overflow-y: auto;
  z-index: 50;
  animation: slideDown 0.2s ease;
}

#search-results.hidden {
  display: none;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-category-header {
  padding: 8px 14px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  position: sticky;
  top: 0;
  z-index: 1;
}

.result-item {
  display: flex;
  align-items: center;
  padding: 12px 14px;
  cursor: pointer;
  transition: background var(--transition-fast);
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

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

.result-item:hover,
.result-item:focus {
  background: var(--accent-blue-light);
}

.result-item:active {
  transform: scale(0.99);
}

.result-emoji {
  font-size: 1.5rem;
  width: 36px;
  text-align: center;
  flex-shrink: 0;
}

.result-info {
  flex: 1;
  min-width: 0;
}

.result-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-carbs {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.result-carbs-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-blue);
  background: var(--accent-blue-light);
  padding: 3px 10px;
  border-radius: var(--border-radius-full);
  white-space: nowrap;
  flex-shrink: 0;
}

.no-results {
  padding: 24px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.no-results .no-results-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 8px;
}

/* ---------- Category Chips ---------- */
#category-chips {
  display: flex;
  gap: 6px;
  padding: 0 0 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#category-chips::-webkit-scrollbar {
  display: none;
}

.category-chip {
  padding: 7px 14px;
  border-radius: var(--border-radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.category-chip:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.category-chip.active {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
}

/* ---------- Weight Input Modal ---------- */
#weight-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: none;
  align-items: flex-end;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

#weight-modal-overlay.visible {
  display: flex;
}

#weight-modal {
  background: var(--bg-secondary);
  border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
  padding: 24px 20px 32px;
  width: 100%;
  max-width: 480px;
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-handle {
  width: 36px;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  margin: 0 auto 20px;
}

.modal-food-info {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.modal-food-emoji {
  font-size: 2.5rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  flex-shrink: 0;
}

.modal-food-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-food-ref {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.weight-input-group {
  position: relative;
  margin-bottom: 16px;
}

#weight-input {
  width: 100%;
  padding: 18px 50px 18px 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: all var(--transition-fast);
  /* Hide number input spinners */
  -moz-appearance: textfield;
}

#weight-input::-webkit-outer-spin-button,
#weight-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

#weight-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-light);
}

.weight-unit-select {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  outline: none;
  appearance: none;
  padding: 4px 20px 4px 8px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right center;
  transition: color var(--transition-fast);
}

.weight-unit-select:hover,
.weight-unit-select:focus {
  color: var(--accent-blue);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* Quick weight buttons */
.quick-weights {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.quick-weight-btn {
  flex: 1;
  min-width: 60px;
  padding: 10px 6px;
  border-radius: var(--border-radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-align: center;
}

.quick-weight-btn:hover {
  background: var(--accent-blue-light);
  color: var(--accent-blue);
}

.quick-weight-btn:active {
  transform: scale(0.95);
}

/* Calculated result in modal */
.calc-result {
  background: var(--accent-blue-light);
  border-radius: var(--border-radius-md);
  padding: 16px;
  text-align: center;
  margin-bottom: 20px;
  transition: all var(--transition-normal);
}

.calc-result-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calc-result-value {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-blue);
  line-height: 1.2;
}

.calc-result-unit {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-blue);
  opacity: 0.7;
}

.modal-actions {
  display: flex;
  gap: 10px;
}

#modal-cancel {
  flex: 1;
  padding: 14px;
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

#modal-cancel:hover {
  background: var(--accent-red-light);
  color: var(--accent-red);
}

#modal-add {
  flex: 2;
  padding: 14px;
  border-radius: var(--border-radius-md);
  background: var(--accent-blue);
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

#modal-add:hover {
  background: var(--accent-blue-dark);
}

#modal-add:active {
  transform: scale(0.98);
}

#modal-add:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ---------- Meal Items List ---------- */
#meal-items-container {
  margin-top: 8px;
}

.meal-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.meal-section-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

#meal-items-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.meal-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  animation: itemSlideIn 0.3s ease;
}

@keyframes itemSlideIn {
  from { opacity: 0; transform: translateX(-12px); }
  to { opacity: 1; transform: translateX(0); }
}

.meal-item:hover {
  border-color: var(--accent-blue);
}

.meal-item-emoji {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.meal-item-info {
  flex: 1;
  min-width: 0;
}

.meal-item-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.meal-item-weight {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.meal-item-carbs {
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent-blue);
  white-space: nowrap;
  flex-shrink: 0;
}

.meal-item-remove {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.meal-item-remove:hover {
  background: var(--accent-red-light);
  color: var(--accent-red);
}

/* Empty state */
#empty-meal {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  display: block;
  opacity: 0.5;
}

.empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.empty-subtitle {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

/* ---------- Meal Actions ---------- */
#meal-actions {
  display: flex;
  gap: 10px;
  padding: 16px 16px;
  position: fixed;
  bottom: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  z-index: 90;
}

#meal-actions.hidden {
  display: none;
}

.btn-primary {
  flex: 2;
  padding: 14px 20px;
  border-radius: var(--border-radius-md);
  background: var(--accent-green);
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

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

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

.btn-secondary {
  flex: 1;
  padding: 14px 20px;
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--accent-red-light);
  color: var(--accent-red);
}

/* ---------- Bottom Navigation ---------- */
#bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: var(--nav-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  min-width: 64px;
}

.nav-btn-icon {
  font-size: 1.3rem;
  line-height: 1;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-btn-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color var(--transition-fast);
}

.nav-btn.active .nav-btn-label,
.nav-btn.active .nav-btn-icon {
  color: var(--accent-blue);
}

.nav-btn.active .nav-btn-label {
  color: var(--accent-blue);
}

.nav-btn.active::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 3px;
  background: var(--accent-blue);
  border-radius: 0 0 3px 3px;
}

.nav-btn:active {
  transform: scale(0.92);
}

/* ---------- History View ---------- */
#history-view .section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
}

#clear-history-btn {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-red);
  padding: 6px 12px;
  border-radius: var(--border-radius-full);
  background: var(--accent-red-light);
  transition: all var(--transition-fast);
}

#clear-history-btn:hover {
  filter: brightness(0.95);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.history-card:hover {
  border-color: var(--accent-blue);
}

.history-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  cursor: pointer;
}

.history-card-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-meal-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.history-date {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.history-card-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.history-total {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent-blue);
}

.history-total-unit {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
}

.history-expand-icon {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}

.history-card.expanded .history-expand-icon {
  transform: rotate(180deg);
}

.history-card-body {
  display: none;
  padding: 0 16px 14px;
  border-top: 1px solid var(--border-color);
}

.history-card.expanded .history-card-body {
  display: block;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

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

.history-item-name {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-weight: 500;
}

.history-item-detail {
  color: var(--text-secondary);
  font-weight: 600;
  white-space: nowrap;
}

.history-card-actions {
  display: flex;
  gap: 8px;
  padding-top: 10px;
}

.history-repeat-btn {
  flex: 1;
  padding: 10px;
  border-radius: var(--border-radius-sm);
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.history-repeat-btn:hover {
  background: var(--accent-blue);
  color: white;
}

.history-delete-btn {
  padding: 10px 14px;
  border-radius: var(--border-radius-sm);
  background: var(--accent-red-light);
  color: var(--accent-red);
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.history-delete-btn:hover {
  background: var(--accent-red);
  color: white;
}

.empty-history {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
}

/* ---------- Settings View ---------- */
#settings-view .settings-section {
  margin-bottom: 24px;
}

.settings-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 10px;
  padding-left: 4px;
}

.settings-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.settings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
}

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

.settings-item:hover {
  background: var(--bg-tertiary);
}

.settings-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.settings-item-icon {
  font-size: 1.2rem;
  width: 32px;
  text-align: center;
}

.settings-item-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.settings-item-desc {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 1px;
}

.settings-item-value {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.settings-dropdown {
  appearance: none;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 32px 6px 12px;
  cursor: pointer;
  outline: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: all var(--transition-fast);
}

.settings-dropdown:hover {
  border-color: var(--accent-blue);
  background-color: var(--bg-secondary);
}

.settings-dropdown:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-light);
}

.settings-item.danger .settings-item-label {
  color: var(--accent-red);
}

.settings-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-tertiary);
  font-size: 0.78rem;
}

.settings-footer-name {
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 4px;
}

/* ---------- Toast Notifications ---------- */
#toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 24px;
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
  background: var(--text-primary);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-smooth);
  z-index: 500;
  white-space: nowrap;
}

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

#toast.toast-success {
  background: var(--accent-green);
}

#toast.toast-error {
  background: var(--accent-red);
}

#toast.toast-info {
  background: var(--accent-blue);
}

/* ---------- Confirm Dialog ---------- */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}

.confirm-dialog {
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 340px;
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
}

.confirm-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.confirm-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.confirm-message {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.5;
}

.confirm-actions {
  display: flex;
  gap: 10px;
}

.confirm-cancel {
  flex: 1;
  padding: 12px;
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.confirm-ok {
  flex: 1;
  padding: 12px;
  border-radius: var(--border-radius-md);
  background: var(--accent-red);
  color: white;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.confirm-ok:active,
.confirm-cancel:active {
  transform: scale(0.97);
}

/* ============================================
   Desktop / Tablet Responsive
   ============================================ */

@media (min-width: 768px) {
  .header-subtitle {
    display: block;
  }

  #total-display {
    margin: 16px 24px 0;
    padding: 24px 32px;
  }

  #total-value {
    font-size: 3.5rem;
  }

  .view {
    padding: 16px 24px;
  }

  #weight-modal {
    border-radius: var(--border-radius-xl);
    margin-bottom: 24px;
  }

  #weight-modal-overlay {
    align-items: center;
  }
}

@media (min-width: 1024px) {
  #app {
    max-width: 1200px;
    margin: 0 auto;
  }

  #app-header {
    padding: 12px 32px;
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
  }

  #total-display {
    margin: 24px 32px 0;
  }

  .view {
    padding: 20px 32px;
  }

  /* Two-column layout for meal builder */
  #meal-view.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
  }

  #meal-view:not(.active) {
    display: none;
  }

  .meal-left-col {
    position: sticky;
    top: calc(var(--header-height) + 16px);
    min-width: 0;
  }

  .meal-right-col {
    min-width: 0;
  }

  #meal-actions {
    position: static;
    padding: 16px 0 0;
    background: transparent;
    border-top: none;
  }

  #bottom-nav {
    position: static;
    max-width: 480px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    border: 1px solid var(--border-color);
    border-bottom: none;
  }

  #main-content {
    padding-bottom: 16px;
  }
}

/* ---------- Utility Classes ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

/* ---------- Scrollbar Styling ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ---------- Selection Color ---------- */
::selection {
  background: var(--accent-blue);
  color: white;
}

/* ---------- Focus Visible ---------- */
:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}