/* ========================================
   COLOR PALETTE SYSTEM
   ======================================== */

:root {
  /* === NEUTRALS === */
  /* Grays for backgrounds, text, and borders */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;
  --neutral-950: #0a0a0a;
  
  /* === BLUES === */
  /* Primary brand color - professional, trustworthy */
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  
  /* === SLATE === */
  /* Cool neutrals for modern UI */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  /* === EMERALD === */
  /* Success states, positive actions */
  --emerald-50: #ecfdf5;
  --emerald-100: #d1fae5;
  --emerald-200: #a7f3d0;
  --emerald-300: #6ee7b7;
  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --emerald-600: #059669;
  --emerald-700: #047857;
  --emerald-800: #065f46;
  --emerald-900: #064e3b;
  
  /* === RED === */
  /* Errors, destructive actions, alerts */
  --red-50: #fef2f2;
  --red-100: #fee2e2;
  --red-200: #fecaca;
  --red-300: #fca5a5;
  --red-400: #f87171;
  --red-500: #ef4444;
  --red-600: #dc2626;
  --red-700: #b91c1c;
  --red-800: #991b1b;
  --red-900: #7f1d1d;
  
  /* === AMBER === */
  /* Warnings, caution states */
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-200: #fde68a;
  --amber-300: #fcd34d;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;
  --amber-800: #92400e;
  --amber-900: #78350f;
  
  /* === CYAN === */
  /* Info states, highlights */
  --cyan-50: #ecfeff;
  --cyan-100: #cffafe;
  --cyan-200: #a5f3fc;
  --cyan-300: #67e8f9;
  --cyan-400: #22d3ee;
  --cyan-500: #06b6d4;
  --cyan-600: #0891b2;
  --cyan-700: #0e7490;
  --cyan-800: #155e75;
  --cyan-900: #164e63;
  
  /* === TEAL === */
  /* Alternative accent color */
  --teal-50: #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-200: #99f6e4;
  --teal-300: #5eead4;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-800: #115e59;
  --teal-900: #134e4a;
  
  /* === INDIGO === */
  /* Professional alternative accent */
  --indigo-50: #eef2ff;
  --indigo-100: #e0e7ff;
  --indigo-200: #c7d2fe;
  --indigo-300: #a5b4fc;
  --indigo-400: #818cf8;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-700: #4338ca;
  --indigo-800: #3730a3;
  --indigo-900: #312e81;
  
  /* === ORANGE === */
  /* Standby accent color */
  --orange-50: #fff7ed;
  --orange-100: #ffedd5;
  --orange-200: #fed7aa;
  --orange-300: #fdba74;
  --orange-400: #fb923c;
  --orange-500: #f97316;
  --orange-600: #ea580c;
  --orange-700: #c2410c;
  --orange-800: #9a3412;
  --orange-900: #7c2d12;
  
  /* === LIME === */
  /* Fresh, energetic accent */
  --lime-50: #f7fee7;
  --lime-100: #ecfccb;
  --lime-200: #d9f99d;
  --lime-300: #bef264;
  --lime-400: #a3e635;
  --lime-500: #84cc16;
  --lime-600: #65a30d;
  --lime-700: #4d7c0f;
  --lime-800: #3f6212;
  --lime-900: #365314;
  
  /* === ROSE === */
  /* Softer alternative to red */
  --rose-50: #fff1f2;
  --rose-100: #ffe4e6;
  --rose-200: #fecdd3;
  --rose-300: #fda4af;
  --rose-400: #fb7185;
  --rose-500: #f43f5e;
  --rose-600: #e11d48;
  --rose-700: #be123c;
  --rose-800: #9f1239;
  --rose-900: #881337;
  
  /* ========================================
     SEMANTIC COLOR TOKENS
     ======================================== */
  
  /* Background Colors */
  --bg-primary: var(--neutral-50);
  --bg-secondary: #ffffff;
  --bg-tertiary: var(--slate-100);
  --bg-hover: var(--slate-200);
  
  /* Text Colors */
  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-600);
  --text-tertiary: var(--neutral-500);
  --text-inverse: #ffffff;
  
  /* Accent Colors - Using Blue as primary */
  --accent-primary: var(--blue-600);
  --accent-secondary: var(--blue-700);
  --accent-light: var(--blue-100);
  --accent-hover: var(--blue-500);
  
  /* Status Colors */
  --success: var(--emerald-600);
  --success-light: var(--emerald-100);
  --danger: var(--red-600);
  --danger-light: var(--red-100);
  --info: var(--cyan-600);
  --info-light: var(--cyan-100);
  --warning: var(--amber-500);
  --warning-light: var(--amber-100);
  
  /* Border Colors */
  --border-color: var(--neutral-300);
  --border-light: var(--neutral-200);
  --border-dark: var(--neutral-400);
  
  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ========================================
   DARK MODE THEME
   ======================================== */

[data-theme="dark"] {
  /* Background Colors */
  --bg-primary: var(--neutral-900);
  --bg-secondary: var(--neutral-800);
  --bg-tertiary: var(--neutral-700);
  --bg-hover: var(--neutral-600);
  
  /* Text Colors */
  --text-primary: var(--neutral-50);
  --text-secondary: var(--neutral-300);
  --text-tertiary: var(--neutral-400);
  --text-inverse: var(--neutral-900);
  
  /* Border Colors */
  --border-color: var(--neutral-600);
  --border-light: var(--neutral-700);
  --border-dark: var(--neutral-500);
  
  /* Accent colors - slightly brighter for dark mode */
  --accent-primary: var(--blue-500);
  --accent-secondary: var(--blue-400);
  --accent-light: var(--blue-900);
  --accent-hover: var(--blue-400);
  
  /* Shadows adjusted for dark backgrounds */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -2px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 10px 10px -5px rgba(0, 0, 0, 0.7);
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  margin: 0;
  padding: var(--spacing-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* ========================================
   HEADER
   ======================================== */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: var(--spacing-md);
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: var(--font-size-3xl);
  color: var(--accent-secondary);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.goal-select {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
  cursor: pointer;
}

.goal-select:focus {
  outline: 2px solid var(--accent-primary);
  border-color: var(--accent-primary);
}

.goal-select:hover {
  background-color: var(--bg-tertiary);
}

[data-theme="dark"] .goal-select {
  background-color: var(--bg-tertiary);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  font-size: var(--font-size-xl);
  border-radius: var(--radius-md);
}

/* ========================================
   SECTIONS & PANELS
   ======================================== */

.section,
section {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-slow);
}

.section:hover,
section:hover {
  box-shadow: var(--shadow-lg);
}

.panel {
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.panel:last-child {
  margin-bottom: 0;
}

.panel:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.3;
  font-weight: 600;
}

h2 {
  font-size: var(--font-size-xl);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.category-title {
  color: var(--accent-secondary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--border-color);
  font-size: var(--font-size-base);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* Color-coded category titles */
.exercise-category:nth-child(1) .category-title {
  color: var(--emerald-600); /* Push - Green */
}

.exercise-category:nth-child(2) .category-title {
  color: var(--amber-500); /* Pull - Orange */
}

.exercise-category:nth-child(3) .category-title {
  color: var(--red-600); /* Legs - Red */
}

[data-theme="dark"] .exercise-category:nth-child(1) .category-title {
  color: var(--emerald-400);
}

[data-theme="dark"] .exercise-category:nth-child(2) .category-title {
  color: var(--amber-400);
}

[data-theme="dark"] .exercise-category:nth-child(3) .category-title {
  color: var(--red-400);
}

/* ========================================
   BUTTONS
   ======================================== */

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: var(--font-size-sm);
  line-height: 1;
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
}

button:hover:not(:disabled) {
  background-color: var(--accent-primary);
  border-color: var(--accent-secondary);
  color: var(--text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

button:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Button Variants */
button.save {
  background-color: var(--success);
  color: var(--text-inverse);
  border-color: var(--success);
}

button.save:hover:not(:disabled) {
  background-color: var(--emerald-700);
  border-color: var(--emerald-700);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

button.cancel,
.modal-button.danger,
button.danger {
  background-color: var(--danger);
  color: var(--text-inverse);
  border-color: var(--danger);
}

button.cancel:hover:not(:disabled),
.modal-button.danger:hover:not(:disabled),
button.danger:hover:not(:disabled) {
  background-color: var(--red-700);
  border-color: var(--red-700);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* Button Sizes */
.history-actions button,
.plate-controls button {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-xs);
}

.plate-controls button:hover:not(:disabled) {
  background-color: var(--accent-secondary);
  color: var(--text-inverse);
  transform: scale(1.1);
}

/* ========================================
   GRID LAYOUTS
   ======================================== */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.grid button {
  transition: all var(--transition-base);
  height: 100%;
  min-height: 3rem;
}

.grid button:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

#platesGrid {
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

/* Exercise List Grid */
.exercise-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.exercise-category {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* ========================================
   FORM ELEMENTS
   ======================================== */

label {
  font-weight: 500;
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="email"],
input[type="password"],
select,
textarea {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  width: 100%;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

input[type="date"] {
  color-scheme: light;
}

[data-theme="dark"] input[type="date"] {
  color-scheme: dark;
}

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

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3E%3C/svg%3E");
  background-position: right var(--spacing-sm) center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: calc(var(--spacing-xl) + var(--spacing-sm));
}

.exercise-select {
  font-size: var(--font-size-base);
  padding: var(--spacing-md);
  font-weight: 500;
}

textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.5;
}

input[type="range"] {
  width: 100%;
  margin: var(--spacing-sm) 0 var(--spacing-md);
  cursor: pointer;
  transition: opacity var(--transition-base);
  accent-color: var(--accent-primary);
}

input[type="range"]:hover {
  opacity: 0.8;
}

input[type="checkbox"] {
  width: auto;
  cursor: pointer;
  accent-color: var(--accent-primary);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
  margin: 0;
}

.conditional-input {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px dashed var(--border-color);
}

.slider-container {
  margin-bottom: var(--spacing-md);
}

.slider-container label {
  font-weight: 600;
  font-size: var(--font-size-base);
}

fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

legend {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.metrics-checkboxes {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
}

.actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

/* ========================================
   WEIGHT DISPLAY
   ======================================== */

.total-weight {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--accent-light), var(--bg-tertiary));
  border-radius: var(--radius-lg);
  border: 2px solid var(--accent-primary);
}

.weight {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--accent-secondary);
  transition: transform var(--transition-slow);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.weight.updated {
  animation: pulse 0.5s ease;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.plate-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-sm);
  gap: var(--spacing-sm);
}

.plate-controls span {
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

/* ========================================
   HISTORY SECTION
   ======================================== */

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.history-header h2 {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.history-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.history-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  border-left: 4px solid var(--accent-primary);
  transition: all var(--transition-base);
  gap: var(--spacing-md);
}

.history-entry:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.history-entry button {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--spacing-xs);
  color: var(--text-secondary);
  min-width: auto;
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.history-entry button:hover:not(:disabled) {
  background-color: var(--danger);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  transform: rotate(90deg);
}

/* ========================================
   WEEK NAVIGATION
   ======================================== */

.week-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.week-controls button {
  padding: var(--spacing-sm) var(--spacing-md);
  flex-shrink: 0;
}

.week-range {
  font-weight: 600;
  text-align: center;
  color: var(--accent-secondary);
  font-size: var(--font-size-lg);
  flex-grow: 1;
}

.week-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-md);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-sm);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-2px);
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent-primary);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* ========================================
   CHART SECTION
   ======================================== */

#chartContainer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--border-color);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.chart-header h3 {
  margin: 0;
  font-size: var(--font-size-xl);
}

.chart-view-toggle {
  display: flex;
  gap: var(--spacing-xs);
  background-color: var(--bg-tertiary);
  padding: var(--spacing-xs);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.toggle-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.toggle-btn.active {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.toggle-btn:not(.active):hover:not(:disabled) {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  transform: none;
}

.chart-wrapper {
  position: relative;
  width: 100%;
  margin-top: var(--spacing-md);
}

#progressChart {
  max-width: 100%;
  height: auto !important;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section:not(.hidden),
.section:not(.hidden) {
  animation: fadeIn 0.4s ease-out;
}

.history-entry {
  animation: slideIn 0.3s ease-out;
}

.history-entry:nth-child(1) { animation-delay: 0s; }
.history-entry:nth-child(2) { animation-delay: 0.05s; }
.history-entry:nth-child(3) { animation-delay: 0.1s; }
.history-entry:nth-child(4) { animation-delay: 0.15s; }
.history-entry:nth-child(5) { animation-delay: 0.2s; }
.history-entry:nth-child(n+6) { animation-delay: 0.25s; }

/* ========================================
   LOADING OVERLAY
   ======================================== */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 900; /* Below modals (1000+) */
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.loading-overlay:not(.hidden) {
  opacity: 1;
  pointer-events: all;
}

.loading-spinner {
  background-color: var(--bg-secondary);
  padding: var(--spacing-xl) var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  animation: slideDown 0.3s ease-out;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--accent-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading-text {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
}

/* ========================================
   BUTTON LOADING STATE
   ======================================== */

button.loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
  cursor: wait;
}

button.loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
  color: var(--text-inverse);
}

/* ========================================
   CONFIRMATION MODAL
   ======================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(10, 10, 10, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000; /* Above loading (900) */
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.modal-overlay:not(.hidden) {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background-color: var(--bg-secondary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform var(--transition-slow);
}

.modal-overlay:not(.hidden) .modal-box {
  transform: scale(1);
  animation: modalBounce 0.4s ease;
}

@keyframes modalBounce {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.modal-box h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-xl);
}

.modal-box p {
  color: var(--text-secondary);
  margin: var(--spacing-md) 0;
  line-height: 1.6;
}

/* Success and Shame Modal Variants */
.success-modal .modal-box {
  border-color: var(--emerald-600);
  background-color: var(--emerald-50);
}

.shame-modal .modal-box {
  border-color: var(--red-600);
  background-color: var(--red-50);
}

[data-theme="dark"] .success-modal .modal-box {
  background-color: rgba(5, 150, 105, 0.1);
  border-color: var(--emerald-500);
}

[data-theme="dark"] .shame-modal .modal-box {
  background-color: rgba(220, 38, 38, 0.1);
  border-color: var(--red-500);
}

.modal-actions {
  margin-top: var(--spacing-lg);
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.modal-button {
  min-width: 100px;
}

/* ========================================
   SETTINGS & MESSAGES
   ======================================== */

.messages-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin: var(--spacing-sm) 0;
  max-height: 300px;
  overflow-y: auto;
  padding: var(--spacing-sm);
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.message-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  gap: var(--spacing-sm);
}

.message-text {
  flex: 1;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  word-break: break-word;
}

.message-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.message-delete {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  background-color: var(--red-600);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.message-delete:hover {
  background-color: var(--red-700);
}

.help-text {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.hidden {
  display: none !important;
}

.muted {
  color: var(--text-secondary);
  text-align: center;
  font-size: var(--font-size-sm);
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
  body {
    padding: var(--spacing-sm);
  }
  
  .container {
    gap: var(--spacing-md);
  }
  
  header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  header h1 {
    font-size: var(--font-size-2xl);
  }
  
  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }
  
  .section,
  section {
    padding: var(--spacing-md);
  }
  
  .panel {
    padding: var(--spacing-sm);
  }
  
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-sm);
  }
  
  #platesGrid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  
  .history-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .history-actions {
    width: 100%;
    justify-content: flex-start;
  }
  
  .week-controls {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .week-controls button {
    width: 100%;
  }
  
  .week-stats {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
  
  .actions {
    flex-direction: column;
  }
  
  .actions button {
    width: 100%;
  }
  
  .chart-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .chart-view-toggle {
    width: 100%;
  }
  
  .toggle-btn {
    flex: 1;
  }
  
  .modal-box {
    margin: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: var(--font-size-xl);
  }
  
  .weight {
    font-size: var(--font-size-3xl);
  }
  
  .history-entry {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .history-entry button {
    align-self: flex-end;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  body {
    background: var(--neutral-50);
    color: var(--neutral-900);
  }
  
  .header-actions,
  .actions,
  .history-actions,
  button {
    display: none !important;
  }
  
  .section,
  section,
  .panel {
    box-shadow: none;
    border: 1px solid var(--neutral-300);
  }
}