/* Enhanced Minimal Design System - Dark/Light Theme with FontAwesome */
/* Improved Gray Palette: #fafafa, #f5f5f5, #e5e5e5, #d4d4d8, #a1a1aa, #71717a, #52525b, #3f3f46, #27272a, #18181b */

:root {
  /* Light theme (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --bg-quaternary: #e5e5e5;
  --text-primary: #18181b;
  --text-secondary: #3f3f46;
  --text-muted: #71717a;
  --text-subtle: #a1a1aa;
  --border-light: #e5e5e5;
  --border-medium: #d4d4d8;
  --border-strong: #a1a1aa;
  --accent-color: #52525b;
  --hover-bg: #f5f5f5;
  --focus-ring: #a1a1aa;
}

[data-theme="dark"] {
  /* Dark theme */
  --bg-primary: #18181b;
  --bg-secondary: #27272a;
  --bg-tertiary: #3f3f46;
  --bg-quaternary: #52525b;
  --text-primary: #fafafa;
  --text-secondary: #e5e5e5;
  --text-muted: #a1a1aa;
  --text-subtle: #71717a;
  --border-light: #3f3f46;
  --border-medium: #52525b;
  --border-strong: #71717a;
  --accent-color: #d4d4d8;
  --hover-bg: #27272a;
  --focus-ring: #71717a;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-image {
  height: 61px;
  width: auto;
  object-fit: contain;
}

.light-logo {
  display: block;
}

.dark-logo {
  display: none;
}

[data-theme="dark"] .light-logo {
  display: none;
}

[data-theme="dark"] .dark-logo {
  display: block;
}

.logo h1 {
  color: var(--text-primary);
  font-size: 20px;
  font-weight: 700;
  margin: 0;
}

.logo h1 a {
  color: inherit;
  text-decoration: none;
}

.logo .subtitle {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 400;
  margin-top: 2px;
}

/* Navigation */
nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 10px 14px;
  font-weight: 500;
  font-size: 14px;
  border-radius: 6px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

nav a:hover {
  background-color: var(--hover-bg);
  color: var(--text-primary);
}

nav a.active {
  background-color: var(--accent-color);
  color: var(--bg-primary);
}

nav a i {
  font-size: 13px;
}

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  margin-left: 8px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.theme-toggle:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
  background: var(--hover-bg);
}

/* Main Content */
main {
  padding: 32px 0;
  min-height: calc(100vh - 140px);
  margin-bottom: 32px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 16px;
  line-height: 1.4;
}

h1 { font-size: 32px; font-weight: 700; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Cards */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card h3 {
  color: var(--text-primary);
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card h3 i {
  color: var(--text-muted);
  font-size: 16px;
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 48px 0;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-light);
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.5;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid var(--accent-color);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
  gap: 8px;
  background: var(--accent-color);
  color: var(--bg-primary);
}

.btn:hover {
  background: var(--text-primary);
  border-color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn i {
  font-size: 13px;
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--hover-bg);
  border-color: var(--border-strong);
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-danger {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 1px solid var(--text-primary);
}

.btn-danger:hover {
  opacity: 0.8;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
  min-height: 32px;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
  font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
  border-color: var(--border-strong);
}

.form-group select {
  appearance: none;
  background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 5"><path fill="%2371717a" d="M2 0L0 2h4zm0 5L0 3h4z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  padding-right: 40px;
  cursor: pointer;
}

.form-group input[type="file"] {
  padding: 8px 12px;
  border: 1px dashed var(--border-medium);
  cursor: pointer;
  background: var(--bg-secondary);
}

.form-group input[type="file"]:hover {
  border-color: var(--border-strong);
  background: var(--hover-bg);
}

.form-group small {
  display: block;
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 12px;
}

.form-group input:disabled,
.form-group select:disabled,
.form-group textarea:disabled {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  cursor: not-allowed;
  border-color: var(--border-light);
}

/* Form Grid Layout */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-grid .form-group {
  margin-bottom: 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

thead {
  background: var(--bg-secondary);
}

th, td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
}

th {
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 12px;
}

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

tr:last-child th,
tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--hover-bg);
}

/* Alerts */
.alert {
  padding: 16px 20px;
  margin-bottom: 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 400;
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  color: var(--text-primary);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.alert i {
  color: var(--text-muted);
  margin-top: 2px;
}

.alert-success,
.alert-error,
.alert-warning,
.alert-info {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

/* Status badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  color: var(--text-primary);
  gap: 6px;
}

.status-badge i {
  font-size: 10px;
}

.status-success,
.status-error,
.status-warning {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

/* Footer */
footer {
  background: var(--bg-secondary);
  color: var(--text-muted);
  text-align: center;
  padding: 24px 0;
  margin-top: auto;
  font-size: 13px;
  border-top: 1px solid var(--border-light);
}

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

footer a:hover {
  text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  header .container {
    flex-direction: column;
    gap: 16px;
  }
  
  nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px;
  }
  
  nav a {
    padding: 8px 12px;
    font-size: 13px;
  }
  
  .grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  .form-grid .form-group {
    margin-bottom: 20px;
  }
  
  .hero {
    padding: 32px 0;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  table {
    font-size: 12px;
  }
  
  th, td {
    padding: 12px 16px;
  }
  
  .card {
    padding: 20px;
  }
  
  main {
    padding: 20px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .hero {
    padding: 24px 0;
  }
  
  .card {
    padding: 16px;
    margin-bottom: 16px;
  }
  
  th, td {
    padding: 8px 12px;
    font-size: 12px;
  }
  
  .btn {
    padding: 10px 16px;
    font-size: 13px;
    min-height: 40px;
  }
  
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }
  
  main {
    padding: 16px 0;
  }
  
  .hero-subtitle {
    font-size: 14px;
  }
}

/* Utility classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}