/* LightLedger Design System */

:root {
  /* Colors */
  --color-primary: #0066cc;
  --color-primary-hover: #0052a3;
  --color-primary-light: #e3f2fd;
  --color-success: #4caf50;
  --color-success-light: #e8f5e9;
  --color-success-dark: #2e7d32;
  --color-error: #f44336;
  --color-error-light: #ffebee;
  --color-error-dark: #c62828;
  --color-warning: #ff9800;
  --color-warning-light: #fff3e0;
  --color-warning-dark: #e65100;
  --color-info: #2196f3;
  --color-info-light: #e3f2fd;
  --color-info-dark: #1565c0;

  --color-text: #333;
  --color-text-secondary: #666;
  --color-text-muted: #999;
  --color-bg: #fff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f5f5f5;
  --color-border: #ddd;
  --color-border-light: #eee;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 50%;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-sm: 0.85rem;
  --font-size-base: 1rem;
  --font-size-md: 1.1rem;
  --font-size-lg: 1.2rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.8rem;
  --font-size-3xl: 2.4rem;
  --line-height: 1.5;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: var(--font-family);
  line-height: var(--line-height);
  color: var(--color-text);
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin-top: 0;
  line-height: 1.3;
}

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

a:hover {
  text-decoration: underline;
}

/* Container */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.container--narrow {
  max-width: 440px;
}

.container--wide {
  max-width: 760px;
}

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

.card h2 {
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-lg);
}

.card p {
  color: var(--color-text-secondary);
  margin: var(--space-xs) 0;
  font-size: 0.95rem;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  width: 100%;
  padding: 0.75rem var(--space-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  font-weight: 500;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.btn-primary:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-block;
  width: 100%;
  padding: 0.75rem var(--space-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  font-weight: 500;
  background: var(--color-bg-tertiary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-secondary:hover {
  background: #e0e0e0;
  text-decoration: none;
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  padding: 0;
  text-decoration: none;
}

.btn-link:hover {
  text-decoration: underline;
}

/* Form elements */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  font-size: 0.95rem;
}

.form-group small {
  display: block;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #ccc;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  background: var(--color-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.15);
}

.form-row {
  display: flex;
  gap: var(--space-md);
}

.form-row .form-group {
  flex: 1;
}

/* Alerts */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-lg);
  font-size: 0.95rem;
}

.alert-success {
  background: var(--color-success-light);
  border: 1px solid var(--color-success);
  color: var(--color-success-dark);
}

.alert-error {
  background: var(--color-error-light);
  border: 1px solid var(--color-error);
  color: var(--color-error-dark);
}

.alert-info {
  background: var(--color-info-light);
  border: 1px solid var(--color-info);
  color: var(--color-info-dark);
}

.alert-warning {
  background: var(--color-warning-light);
  border: 1px solid var(--color-warning);
  color: var(--color-warning-dark);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-lg);
  font-size: 0.8rem;
  font-weight: 500;
}

.badge-success {
  background: var(--color-success-light);
  color: var(--color-success-dark);
}

.badge-error {
  background: var(--color-error-light);
  color: var(--color-error-dark);
}

.badge-warning {
  background: var(--color-warning-light);
  color: var(--color-warning-dark);
}

.badge-info {
  background: var(--color-info-light);
  color: var(--color-info-dark);
}

.badge-neutral {
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

/* Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border-light);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Metric card (dashboard hero) */
.metric-card {
  text-align: center;
  padding: var(--space-lg);
}

.metric-card .metric-value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
}

.metric-card .metric-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Utility */
.hidden {
  display: none !important;
}

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

.text-secondary {
  color: var(--color-text-secondary);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-sm {
  font-size: var(--font-size-sm);
}

/* File upload area (reused on settings) */
.file-upload-area {
  border: 2px dashed #ccc;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.file-upload-area:hover {
  border-color: var(--color-primary);
  background: #f8fbff;
}

.file-upload-area.has-files {
  border-color: var(--color-success);
  background: #f1f8f1;
}

.file-upload-area p {
  margin: var(--space-xs) 0;
  color: var(--color-text-secondary);
}