/**
 * EIDX Design System - DRM Policy Admin
 *
 * Implements FR-050: Unified Visual Design System with CMS dark theme
 * Implements FR-053: Sidebar navigation with responsive design
 * Implements NFR-015: Design system documentation
 *
 * Design Tokens (CSS Variables)
 */

:root {
  /* Color Palette - Dark Theme (FR-050) */
  --color-primary: #00bcd4;           /* Primary action color */
  --color-primary-hover: #00acc1;
  --color-secondary: #607d8b;
  --color-success: #4caf50;
  --color-danger: #f44336;
  --color-warning: #ff9800;
  --color-info: #2196f3;

  /* Dark Theme Colors */
  --color-dark-bg: #121212;           /* Main background */
  --color-sidebar-bg: #1a2332;        /* Sidebar background (per spec) */
  --color-surface: #1e1e1e;           /* Card/surface background */
  --color-surface-elevated: #2a2a2a;  /* Elevated surfaces */

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-disabled: rgba(255, 255, 255, 0.38);

  /* Border Colors */
  --color-border: #dee2e6;
  --color-border-dark: #333;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-monospace: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --font-size-base: 14px;
  --font-size-sm: 12px;
  --font-size-lg: 16px;
  --font-size-xl: 20px;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing Scale */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Sidebar Dimensions (FR-053) */
  --sidebar-width: 250px;
  --sidebar-width-collapsed: 60px;
  --sidebar-transition: 0.3s ease;

  /* Z-Index Scale */
  --z-index-sidebar: 1000;
  --z-index-header: 1010;
  --z-index-modal: 1050;
  --z-index-toast: 1060;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.16);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.2);

  /* Border Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-full: 9999px;
}

/* Global Styles */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-dark-bg);
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

h1 { font-size: 32px; }
h2 { font-size: 28px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }
h5 { font-size: 18px; }
h6 { font-size: 16px; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Layout: Main Container with Sidebar (FR-053) */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation (FR-053) */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--color-sidebar-bg);
  color: var(--color-text-primary);
  overflow-x: hidden;
  overflow-y: auto;
  transition: width var(--sidebar-transition);
  z-index: var(--z-index-sidebar);
  box-shadow: var(--shadow-md);
}

.sidebar.collapsed {
  width: var(--sidebar-width-collapsed);
}

.sidebar-header {
  padding: var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid var(--color-border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar.collapsed .sidebar-brand {
  display: none;
}

.sidebar-toggle {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  font-size: var(--font-size-lg);
  transition: color 0.2s;
}

.sidebar-toggle:hover {
  color: var(--color-text-primary);
}

.sidebar-nav {
  padding: var(--spacing-md) 0;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border-left: 3px solid transparent;
}

.sidebar-nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--color-text-primary);
  text-decoration: none;
}

.sidebar-nav-item.active {
  background-color: rgba(0, 188, 212, 0.1);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.sidebar-nav-item i,
.sidebar-nav-item .icon {
  width: 20px;
  margin-right: var(--spacing-md);
  text-align: center;
  font-size: var(--font-size-lg);
}

.sidebar.collapsed .sidebar-nav-item {
  padding: var(--spacing-md) var(--spacing-sm);
  justify-content: center;
}

.sidebar.collapsed .sidebar-nav-item i,
.sidebar.collapsed .sidebar-nav-item .icon {
  margin-right: 0;
}

.sidebar.collapsed .sidebar-nav-text {
  display: none;
}

/* Submenu (FR-051: Admin menu) */
.sidebar-nav-submenu {
  display: none;
  background-color: rgba(0, 0, 0, 0.2);
}

.sidebar-nav-submenu.expanded {
  display: block;
}

.sidebar-nav-submenu .sidebar-nav-item {
  padding-left: var(--spacing-2xl);
  font-size: var(--font-size-sm);
}

.sidebar.collapsed .sidebar-nav-submenu {
  display: none !important;
}

/* Submenu indicator (Material Symbols expand_more icon) */
.sidebar-nav-item.has-submenu {
  position: relative;
}

.sidebar-nav-item.has-submenu .submenu-indicator {
  margin-left: auto;
  transition: transform 0.2s ease;
  font-size: 20px;
}

.sidebar-nav-item.has-submenu.expanded .submenu-indicator {
  transform: rotate(180deg);
}

.sidebar.collapsed .sidebar-nav-item.has-submenu .submenu-indicator {
  display: none;
}

/* Main Content Area */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: var(--spacing-lg);
  transition: margin-left var(--sidebar-transition);
  background-color: var(--color-dark-bg);
}

.sidebar.collapsed + .main-content {
  margin-left: var(--sidebar-width-collapsed);
}

/* Cards (FR-050: Card-based layout) */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-lg);
}

.card-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-dark);
  font-weight: var(--font-weight-semibold);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border-dark);
  background-color: rgba(0, 0, 0, 0.1);
}

/* Buttons (FR-050: Consistent button styles) */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  line-height: 1.5;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.9;
}

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

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

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

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-surface-elevated);
}

.btn-sm {
  padding: 4px 12px;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 12px 24px;
  font-size: var(--font-size-lg);
}

/* Forms (FR-050: Consistent form inputs) */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(0, 188, 212, 0.2);
}

.form-control::placeholder {
  color: var(--color-text-disabled);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23fff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
}

.table th,
.table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border-dark);
}

.table th {
  font-weight: var(--font-weight-semibold);
  background-color: var(--color-surface-elevated);
  color: var(--color-text-primary);
}

.table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Alerts */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
}

.alert-success {
  background-color: rgba(76, 175, 80, 0.1);
  border-left-color: var(--color-success);
  color: #a5d6a7;
}

.alert-danger {
  background-color: rgba(244, 67, 54, 0.1);
  border-left-color: var(--color-danger);
  color: #ef9a9a;
}

.alert-warning {
  background-color: rgba(255, 152, 0, 0.1);
  border-left-color: var(--color-warning);
  color: #ffcc80;
}

.alert-info {
  background-color: rgba(33, 150, 243, 0.1);
  border-left-color: var(--color-info);
  color: #90caf9;
}

/* Mobile Responsive (FR-053) */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--sidebar-transition);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .mobile-menu-toggle {
    display: block;
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    z-index: calc(var(--z-index-sidebar) + 1);
    background-color: var(--color-sidebar-bg);
    color: var(--color-text-primary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-lg);
  }
}

@media (min-width: 769px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-secondary); }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.d-flex { display: flex; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }