:root {
  /* Brand Colors */
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --secondary-color: #64748b;
  --secondary-hover: #475569;
  
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;

  /* Neutral Colors */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  
  --text-main: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-focus: #2563eb;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-base: all 0.2s ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition-base);
}

/* Layout */
.container {
  max-width: 100%;
  margin: 0 auto;
  padding: var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    max-width: 640px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.025em;
}

h1 { font-size: 1.5rem; line-height: 2rem; }
h2 { font-size: 1.25rem; line-height: 1.75rem; }
h3 { font-size: 1.125rem; line-height: 1.75rem; }

p {
  margin: 0 0 var(--spacing-md);
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); font-size: 0.875rem; }
.text-sm { font-size: 0.875rem; }
.font-bold { font-weight: 600; }

/* Components: Card */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border-color);
}

/* Components: Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-base);
  border: 1px solid transparent;
  line-height: 1;
  white-space: nowrap;
  background-color: var(--primary-color);
  color: white;
}

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

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

.btn.secondary {
  background-color: white;
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn.secondary:hover {
  background-color: var(--bg-body);
  color: var(--text-main);
}

.btn.danger {
  background-color: var(--danger-color);
  color: white;
}

.btn.full-width {
  width: 100%;
  display: flex;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

/* Components: Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background-color: var(--bg-input);
  transition: var(--transition-base);
  color: var(--text-main);
  font-family: inherit;
}

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

/* Components: Navbar/Header */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-sm) 0;
}

.nav-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Components: Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--primary-light);
  color: var(--primary-color);
}

/* Utilities */
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-4 { margin-bottom: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-4 { margin-top: var(--spacing-md); }
.p-0 { padding: 0; }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--spacing-sm); }
.gap-4 { gap: var(--spacing-md); }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Additional Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

/* Extra Utilities */
.text-primary { color: var(--primary-color); }
.text-lg { font-size: 1.1rem; }
.ml-2 { margin-left: var(--spacing-sm); }
.rounded { border-radius: var(--radius-md); }
.p-3 { padding: var(--spacing-md); }
.block { display: block; }
.bg-body { background-color: var(--bg-body); }

/* Semantic Color Utilities */
.bg-red-50 { background-color: #fee2e2; }
.text-red-700 { color: #b91c1c; }
.bg-blue-50 { background-color: #eff6ff; }
.text-blue-700 { color: #1d4ed8; }
.bg-yellow-50 { background-color: #fef3c7; }
.text-yellow-700 { color: #b45309; }

/* Page Layout Helpers */
.center-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}
.auth-container {
  width: 100%;
  max-width: 420px;
}

/* Specific: Chart Bar */
.chart-row {
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  font-size: 0.9rem;
}

.chart-label {
  width: 100px;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.chart-bar-bg {
  flex-grow: 1;
  height: 8px;
  background-color: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 var(--spacing-sm);
}

.chart-bar-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: var(--radius-full);
}

.chart-value {
  width: 30px;
  text-align: right;
  font-weight: 600;
  color: var(--text-main);
}

/* App Specific Components */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

.card-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

@media (max-width: 639px) {
  .btn {
    white-space: normal;
    padding: 0.75rem 1rem;
  }
  .btn-group {
    grid-template-columns: 1fr;
  }
}
.btn.outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.record-header {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px dashed var(--border-color);
  color: var(--primary-color);
}

.text-section {
  margin-bottom: var(--spacing-md);
}

.text-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.text-content {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-muted);
  background: var(--bg-body);
  border-radius: var(--radius-md);
}

/* Misc */
.title { margin-bottom: var(--spacing-md); }
.note { margin-top: var(--spacing-sm); color: var(--text-muted); font-size: 0.85rem; text-align: center; }