/**
 * Nexus Enterprise DS v1.0.4 — Precision Engineering
 * Tokens: DESIGN.md + code.html
 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root,
[data-theme="nexus-enterprise"] {
  /* Material / Nexus tokens */
  --background: #faf8ff;
  --on-background: #191b23;
  --surface: #faf8ff;
  --on-surface: #191b23;
  --on-surface-variant: #434655;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f3f3fe;
  --surface-container: #ededf9;
  --surface-container-high: #e7e7f3;
  --surface-container-highest: #e1e2ed;
  --surface-dim: #d9d9e5;
  --surface-bright: #faf8ff;
  --surface-variant: #e1e2ed;
  --outline: #737686;
  --outline-variant: #c3c6d7;
  --surface-tint: #0053db;
  --primary: #004ac6;
  --on-primary: #ffffff;
  --primary-container: #2563eb;
  --on-primary-container: #eeefff;
  --inverse-primary: #b4c5ff;
  --secondary: #712ae2;
  --on-secondary: #ffffff;
  --secondary-container: #8a4cfc;
  --on-secondary-container: #fffbff;
  --secondary-fixed: #eaddff;
  --tertiary: #005d73;
  --on-tertiary: #ffffff;
  --tertiary-container: #007793;
  --on-tertiary-container: #dcf4ff;
  --tertiary-fixed-dim: #6cd3f7;
  --primary-fixed: #dbe1ff;
  --primary-fixed-dim: #b4c5ff;
  --error: #ba1a1a;
  --on-error: #ffffff;
  --error-container: #ffdad6;
  --on-error-container: #93000a;

  /* SKYSL / flota legacy aliases */
  --bg: #f3f3fe;
  --surface2: #e7e7f3;
  --border: #c3c6d7;
  --text: #191b23;
  --muted: #434655;
  --accent: #2563eb;
  --accent2: #8a4cfc;
  --accent-dim: #004ac6;
  --ok: #005d73;
  --warn: #c97a00;
  --err: #ba1a1a;
  --crit: #ba1a1a;
  --danger: #ba1a1a;
  --heroFrom: #dbe1ff;
  --heroTo: #faf8ff;
  --card: #ffffff;

  /* Typography */
  --font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-size-base: 16px;
  --radius-sm: 0.125rem;
  --radius: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* Spacing (8px grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --gutter: 24px;

  /* Elevation */
  --shadow-sm: 0 1px 2px 0 rgba(25, 27, 35, 0.06);
  --shadow-md: 0 1px 3px 0 rgba(25, 27, 35, 0.1), 0 1px 2px -1px rgba(25, 27, 35, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(25, 27, 35, 0.08), 0 4px 6px -4px rgba(25, 27, 35, 0.06);
  --shadow-xl: 0 20px 25px -5px rgba(25, 27, 35, 0.1), 0 10px 10px -5px rgba(25, 27, 35, 0.04);
}

/* Base */
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--font-size-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

/* Typography scale */
.text-display-lg { font-size: 48px; line-height: 56px; font-weight: 700; letter-spacing: -0.02em; }
.text-display-sm { font-size: 36px; line-height: 44px; font-weight: 700; letter-spacing: -0.02em; }
.text-h1 { font-size: 30px; line-height: 38px; font-weight: 600; letter-spacing: -0.01em; }
.text-h2 { font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: -0.01em; }
.text-h3 { font-size: 20px; line-height: 28px; font-weight: 600; letter-spacing: -0.01em; }
.text-body-lg { font-size: 18px; line-height: 28px; font-weight: 400; }
.text-body-md { font-size: 16px; line-height: 24px; font-weight: 400; }
.text-body-sm { font-size: 14px; line-height: 20px; font-weight: 400; }
.text-label-md { font-size: 14px; line-height: 20px; font-weight: 500; letter-spacing: 0.01em; }
.text-label-sm { font-size: 12px; line-height: 16px; font-weight: 600; letter-spacing: 0.02em; }

/* Buttons */
.btn-primary {
  background: var(--primary-container);
  color: var(--on-primary);
  border: none;
  border-radius: var(--radius-lg);
  padding: 8px 24px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.btn-primary:hover { background: #1d4ed8; }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled {
  background: var(--outline-variant);
  color: color-mix(in srgb, var(--on-surface-variant) 50%, transparent);
  cursor: not-allowed;
}

.btn-secondary {
  background: color-mix(in srgb, var(--secondary-container) 10%, transparent);
  color: var(--secondary);
  border: 1px solid color-mix(in srgb, var(--secondary) 20%, transparent);
  border-radius: var(--radius-lg);
  padding: 8px 24px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.btn-secondary:hover {
  background: color-mix(in srgb, var(--secondary-container) 20%, transparent);
  border-color: color-mix(in srgb, var(--secondary) 40%, transparent);
}

.btn-ghost {
  background: transparent;
  color: var(--on-surface-variant);
  border: none;
  border-radius: var(--radius-lg);
  padding: 8px 24px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.btn-ghost:hover {
  background: var(--surface-container-high);
  color: var(--primary-container);
}

/* Cards */
.card {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--outline) 60%, var(--outline-variant));
}

/* Inputs */
input, select, textarea {
  font-family: var(--font);
  font-size: 16px;
  line-height: 24px;
  color: var(--on-surface);
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 8px 16px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary-container);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary-container) 20%, transparent);
}
input.error, select.error, textarea.error {
  border-color: var(--error);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--error) 20%, transparent);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  line-height: 16px;
}
.badge-active { background: var(--primary-container); color: var(--on-primary); }
.badge-completed { background: color-mix(in srgb, var(--tertiary) 10%, transparent); color: var(--tertiary); border: 1px solid color-mix(in srgb, var(--tertiary) 20%, transparent); }
.badge-critical { background: var(--error-container); color: var(--on-error-container); }
.badge-pending { background: var(--surface-container-high); color: var(--on-surface-variant); border: 1px solid var(--outline-variant); }

/* Alerts */
.alert-info {
  padding: 16px;
  background: color-mix(in srgb, var(--primary-container) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 20%, transparent);
  border-radius: var(--radius-xl);
  color: var(--on-surface-variant);
}
.alert-error {
  padding: 16px;
  background: color-mix(in srgb, var(--error-container) 20%, transparent);
  border: 1px solid color-mix(in srgb, var(--error) 20%, transparent);
  border-radius: var(--radius-xl);
  color: var(--on-surface-variant);
}

/* Sidebar shell (Nexus layout) */
.nexus-sidebar {
  width: 240px;
  background: var(--surface-container-lowest);
  border-right: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-sm);
  padding: var(--space-md) 0;
}
.nexus-sidebar nav a {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 8px 16px;
  margin: 0 8px;
  border-radius: var(--radius-xl);
  color: var(--on-surface-variant);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.nexus-sidebar nav a:hover {
  background: var(--surface-container-high);
  color: var(--on-surface);
}
.nexus-sidebar nav a.active {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}

.nexus-topbar {
  height: 64px;
  background: var(--surface-container-lowest);
  border-bottom: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
}