@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200');

:root {
  /* Surface colors */
  --bg-color: #031427;
  --surface: #031427;
  --surface-dim: #031427;
  --surface-bright: #2a3a4f;
  --surface-container-lowest: #000f21;
  --surface-container-low: #0b1c30;
  --surface-container: #102034;
  --surface-container-high: #1b2b3f;
  --surface-container-highest: #26364a;
  
  /* Text / Icons */
  --on-surface: #d3e4fe;
  --on-surface-variant: #d1c6ab;
  --on-surface-muted: #94a3b8; /* Tailwind slate-400 for better contrast on dark */
  
  /* Borders */
  --outline: #9a9078;
  --outline-variant: #4d4632;
  --surface-variant: #26364a;

  /* Primary (Safety Yellow) */
  --primary: #facc15; /* Using container for better contrast */
  --on-primary: #3c2f00;
  --primary-container: #ffecb9;
  --on-primary-container: #6c5700;
  
  /* Secondary (Slate Navy) */
  --secondary: #bcc7de;
  --on-secondary: #263143;
  --secondary-container: #3e495d;
  --on-secondary-container: #aeb9d0;

  /* Status Colors */
  --error: #ffb4ab;
  --on-error: #690005;
  --error-container: #93000a;
  --on-error-container: #ffdad6;
  
  --success: #10b981; /* Emerald Green */
  --on-success: #022c22;
  --success-container: #065f46;
  --on-success-container: #d1fae5;

  --warning: #f59e0b;
  --on-warning: #451a03;
  --warning-container: #b45309;
  --on-warning-container: #fef3c7;
  
  --info: #3b82f6;
  --on-info: #eff6ff;

  /* Layout & Spacing */
  --spacing-unit: 4px;
  --border-radius-sm: 0.125rem;
  --border-radius: 0.25rem; /* 4px soft shapes */
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem; /* 8px for large containers */
  --border-radius-pill: 9999px;
  
  --touch-target: 48px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--on-surface);
  line-height: 1.5;
  font-size: 16px; /* body-md */
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--on-surface);
  margin-bottom: 0.5em;
}

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

/* ================== LAYOUT ================== */
.app-container {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

@media (min-width: 768px) {
  .app-container {
    flex-direction: row;
  }
}

/* Sidebar */
.sidebar {
  background-color: var(--surface-container-low);
  border-right: 1px solid var(--surface-variant);
  width: 100%;
  display: flex;
  flex-direction: column;
}
@media (min-width: 768px) {
  .sidebar {
    width: 280px;
    height: 100vh;
    position: sticky;
    top: 0;
    overflow-y: auto;
  }
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--surface-variant);
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-nav {
  padding: 1rem 0;
  flex-grow: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  color: var(--on-surface);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
  min-height: var(--touch-target);
}

.nav-link:hover, .nav-link.active {
  background-color: var(--surface-container-high);
  color: var(--primary);
  text-decoration: none;
}

.main-content {
  flex-grow: 1;
  padding: 16px; /* margin-mobile */
}
@media (min-width: 768px) {
  .main-content {
    padding: 32px; /* margin-desktop */
  }
}

/* ================== COMPONENTS ================== */
.card {
  background-color: var(--surface-container);
  border: 1px solid var(--surface-variant);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.card-header {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--surface-variant);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 14px; /* label-md */
  font-weight: 600;
  color: var(--on-surface-variant);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--surface-container-highest);
  border: 1px solid var(--surface-variant);
  border-radius: var(--border-radius);
  color: var(--on-surface);
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  min-height: var(--touch-target);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(250, 204, 21, 0.2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  min-height: var(--touch-target);
  transition: all 0.2s;
  text-decoration: none;
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--on-surface);
  border: 1px solid var(--surface-variant);
}
.btn-secondary:hover {
  background-color: var(--surface-container-highest);
}

.btn-danger {
  background-color: var(--error);
  color: var(--on-error);
}
.btn-danger:hover {
  background-color: var(--error-container);
  color: var(--on-error-container);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-pill);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-success { background-color: var(--success); color: var(--on-success); }
.badge-error { background-color: var(--error); color: var(--on-error); }
.badge-warning { background-color: var(--warning); color: var(--on-warning); }
.badge-info { background-color: var(--info); color: var(--on-info); }
.badge-outline { 
  background-color: transparent; 
  border: 1px solid var(--surface-variant); 
  color: var(--on-surface); 
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 1rem;
  font-size: 14px;
  font-weight: 600;
  color: var(--on-surface-variant);
  border-bottom: 2px solid var(--surface-variant);
  background-color: var(--surface-container-low);
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--surface-variant);
  font-family: 'Inter', sans-serif;
  font-variant-numeric: tabular-nums;
}

tbody tr:nth-child(even) {
  background-color: rgba(255,255,255,0.02);
}

tbody tr:hover {
  background-color: var(--surface-container-highest);
}

/* Utilities */
.grid { display: grid; gap: 1rem; }
@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-error { color: var(--error); }
.text-success { color: var(--success); }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }