@layer reset, tokens, base, layout, components, utilities;

@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    color-scheme: light;
  }

  body {
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
  }

  img, svg, video, iframe {
    display: block;
    max-width: 100%;
  }
}

@layer tokens {
  :root {
    /* Institutional Palette */
    --nils-navy: #0a192f;
    --nils-navy-light: #112240;
    --nils-blue: #1243e8;
    --nils-blue-hover: #0e35b8;
    --nils-blue-soft: rgba(18, 67, 232, 0.08);
    --nils-gold: #d97706;
    --nils-gold-bright: #f59e0b;
    --nils-gold-soft: rgba(245, 158, 11, 0.14);
    --nils-emerald: #059669;

    /* Surfaces & Text */
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --bg-subtle: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.82);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    /* Hairline Semi-Transparent Borders & Layered Shadows (Emil Kowalski Craft) */
    --border-hairline: rgba(15, 23, 42, 0.08);
    --border-strong: rgba(15, 23, 42, 0.15);
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 4px 12px -2px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 8px -2px rgba(15, 23, 42, 0.06), 0 14px 28px -6px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 24px -6px rgba(15, 23, 42, 0.08), 0 28px 56px -12px rgba(15, 23, 42, 0.14);
    --shadow-blue: 0 8px 24px -4px rgba(18, 67, 232, 0.28);

    /* Custom Easing Curves (emil-design-eng & apple-design) */
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
    --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);

    /* Layout & Radii */
    --container-max: 1240px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --radius-pill: 9999px;

    /* Typography */
    --font-sans: 'Plus Jakarta Sans', 'Inter', 'Montserrat', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  }
}

@layer base {
  body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-page);
    font-optical-sizing: auto;
  }

  /* Optical Sizing, Tracking & Leading (apple-design & ui-cheatsheet) */
  h1, .nils-display {
    font-size: clamp(2rem, 1.35rem + 2.5vw, 3.25rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
    font-weight: 800;
    color: var(--text-primary);
  }

  h2, .nils-h2 {
    font-size: clamp(1.45rem, 1.15rem + 1.3vw, 2.15rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-weight: 700;
    color: var(--text-primary);
  }

  h3, .nils-h3 {
    font-size: clamp(1.125rem, 1.02rem + 0.4vw, 1.35rem);
    line-height: 1.28;
    letter-spacing: -0.012em;
    font-weight: 700;
    color: var(--text-primary);
  }

  p, .nils-prose {
    max-width: 65ch;
    color: var(--text-secondary);
    line-height: 1.68;
  }

  /* Tabular numerals prevent layout jitter on live counts, dates, and prices */
  .tabular-nums,
  time,
  .nils-stat-value,
  .nils-price,
  .nils-date,
  .nils-badge-count {
    font-variant-numeric: tabular-nums;
  }

  /* Mobile-native input rule: minimum 16px prevents iOS Safari page zoom on focus */
  input, textarea, select {
    font-family: inherit;
    font-size: 16px;
    color: var(--text-primary);
  }

  /* Mobile-native control rules: instant tap, no accidental text selection */
  button,
  a,
  [role="button"],
  .nils-btn,
  .nils-pill,
  .nils-card-interactive,
  .nils-nav-link {
    touch-action: manipulation;
  }

  button,
  [role="button"],
  .nils-btn,
  .nils-pill,
  .nils-badge {
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

@layer layout {
  .nils-container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: clamp(1rem, 3vw, 2rem);
  }

  .nils-section {
    padding-block: clamp(3rem, 6vw, 5.5rem);
  }

  .nils-section-sm {
    padding-block: clamp(2rem, 4vw, 3.5rem);
  }

  .nils-section-header {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    margin-block-end: clamp(1.75rem, 3.5vw, 2.75rem);
  }

  .nils-section-header.center {
    align-items: center;
    text-align: center;
  }

  .nils-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--nils-blue);
    background: var(--nils-blue-soft);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-pill);
    width: fit-content;
  }
}

@layer components {
  /* 1. Top Government Ribbon & Translucent Floating Header (apple-design §12) */
  .nils-gov-ribbon {
    background: var(--nils-navy);
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.78rem;
    padding-block: 0.45rem;
    padding-top: calc(0.45rem + env(safe-area-inset-top, 0px));
    border-block-end: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nils-gov-ribbon-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .nils-gov-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
  }

  .nils-gov-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.22);
  }

  .nils-gov-links {
    display: flex;
    align-items: center;
    gap: 1.15rem;
    flex-wrap: wrap;
  }

  .nils-gov-links a {
    color: rgba(255, 255, 255, 0.82);
    transition: color 150ms ease;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
  }

  .nils-lang-switcher {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-pill);
    padding: 0.15rem;
    gap: 0.15rem;
  }

  .nils-lang-switcher a {
    padding: 0.18rem 0.6rem;
    border-radius: var(--radius-pill);
    font-size: 0.73rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.85);
    transition: background-color 150ms ease, color 150ms ease, transform 120ms var(--ease-out);
  }

  .nils-lang-switcher a.active {
    background: #ffffff;
    color: var(--nils-navy);
  }

  .nils-lang-switcher a:active {
    transform: scale(0.96);
  }

  /* Main Translucent Header */
  .nils-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-block-end: 1px solid var(--border-hairline);
    transition: box-shadow 200ms var(--ease-out), background-color 200ms ease;
  }

  .nils-header.is-scrolled {
    box-shadow: var(--shadow-sm);
    background: rgba(255, 255, 255, 0.9);
  }

  .nils-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    min-height: 74px;
  }

  .nils-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    flex-shrink: 0;
    transition: transform 150ms var(--ease-out);
  }

  .nils-brand:active {
    transform: scale(0.98);
  }

  .nils-brand-logo {
    height: 48px;
    width: auto;
    object-fit: contain;
    flex-shrink: 0;
  }

  .nils-brand-text {
    display: flex;
    flex-direction: column;
  }

  .nils-brand-title {
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--nils-navy);
    line-height: 1.15;
  }

  .nils-brand-subtitle {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    max-width: 28ch;
    line-height: 1.25;
  }

  /* Navigation Links & Origin-Aware Popover Dropdowns */
  .nils-nav {
    display: flex;
    align-items: center;
    gap: 0.2rem;
  }

  .nils-nav-item {
    position: relative;
  }

  .nils-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 150ms ease, background-color 150ms ease, transform 120ms var(--ease-out);
    white-space: nowrap;
  }

  .nils-nav-link.active {
    color: var(--nils-blue);
    background: var(--nils-blue-soft);
  }

  .nils-nav-link:active {
    transform: scale(0.97);
  }

  .nils-nav-chevron {
    width: 14px;
    height: 14px;
    transition: transform 180ms var(--ease-out);
    opacity: 0.65;
  }

  /* Origin-aware dropdown popover: scales from top trigger, never scale(0) */
  .nils-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    inset-inline-start: 0;
    min-width: 230px;
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.45rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: scale(0.96) translateY(-4px);
    transform-origin: top left;
    transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out), visibility 180ms;
    z-index: 1100;
  }

  /* Invisible hover bridge so diagonal cursor movement doesn't close menu (Sonner Principle #4) */
  .nils-dropdown::before {
    content: "";
    position: absolute;
    top: -10px;
    inset-inline: 0;
    height: 10px;
  }

  .nils-nav-item:focus-within > .nils-dropdown,
  .nils-nav-item.is-open > .nils-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: scale(1) translateY(0);
  }

  .nils-dropdown-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: background-color 140ms ease, color 140ms ease, transform 120ms var(--ease-out);
  }

  .nils-dropdown-link:active {
    transform: scale(0.98);
  }

  .nils-header-actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-shrink: 0;
  }

  /* 2. Buttons — Responsive Press Feedback (scale 0.97, 150ms ease-out) */
  .nils-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform 150ms var(--ease-out), background-color 160ms ease, border-color 160ms ease, color 160ms ease, box-shadow 180ms var(--ease-out);
    white-space: nowrap;
  }

  .nils-btn:active {
    transform: scale(0.97);
  }

  .nils-btn-primary {
    background: var(--nils-blue);
    color: #ffffff;
    box-shadow: var(--shadow-blue);
  }

  .nils-btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-xs);
  }

  .nils-btn-gold {
    background: var(--nils-gold-bright);
    color: var(--nils-navy);
    font-weight: 700;
  }

  .nils-btn-ghost {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.22);
  }

  .nils-btn-lg {
    padding: 0.88rem 1.6rem;
    font-size: 0.98rem;
    border-radius: 12px;
  }

  /* Mobile Menu Trigger & Slide-Over Sheet */
  .nils-burger {
    display: none;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-hairline);
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: transform 140ms var(--ease-out), background-color 150ms ease;
  }

  .nils-burger:active {
    transform: scale(0.95);
  }

  .nils-drawer-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 240ms var(--ease-out), visibility 240ms;
    z-index: 2000;
  }

  .nils-drawer-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nils-drawer {
    position: fixed;
    top: 0;
    inset-inline-end: 0;
    bottom: 0;
    width: min(340px, 88vw);
    background: var(--bg-surface);
    box-shadow: var(--shadow-lg);
    padding: calc(1.25rem + env(safe-area-inset-top, 0px)) 1.25rem calc(1.5rem + env(safe-area-inset-bottom, 0px));
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(100%);
    transition: transform 260ms var(--ease-drawer);
    z-index: 2001;
  }

  .nils-drawer-backdrop.is-open .nils-drawer {
    transform: translateX(0);
  }

  .nils-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block-end: 1rem;
    border-block-end: 1px solid var(--border-hairline);
  }

  .nils-drawer-links {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .nils-drawer-links a {
    padding: 0.7rem 0.85rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 140ms ease, transform 120ms var(--ease-out);
  }

  .nils-drawer-links a:active {
    transform: scale(0.98);
    background: var(--bg-subtle);
  }

  .nils-drawer-sub {
    padding-inline-start: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    border-inline-start: 2px solid var(--border-hairline);
    margin-inline-start: 0.85rem;
    margin-block: 0.2rem 0.4rem;
  }

  .nils-drawer-sub a {
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.45rem 0.75rem;
  }

  /* 3. Hero Section */
  .nils-hero {
    position: relative;
    background: radial-gradient(120% 120% at 85% 15%, #1e3a8a 0%, #0a192f 62%, #061021 100%);
    color: #ffffff;
    padding-block: clamp(3rem, 6vw, 5rem);
    overflow: hidden;
    border-block-end: 4px solid var(--nils-gold-bright);
  }

  .nils-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px);
    background-size: 28px 28px;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent 90%);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent 90%);
    pointer-events: none;
  }

  .nils-hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.08fr 0.92fr;
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: center;
  }

  .nils-hero-content {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .nils-hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #fcd34d;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-pill);
    width: fit-content;
  }

  .nils-hero h1 {
    color: #ffffff;
  }

  .nils-hero-lead {
    color: rgba(255, 255, 255, 0.82);
    font-size: clamp(1rem, 0.95rem + 0.35vw, 1.15rem);
    max-width: 58ch;
  }

  .nils-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-block-start: 0.35rem;
  }

  .nils-hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-block-start: 1rem;
    padding-block-start: 1.5rem;
    border-block-start: 1px solid rgba(255, 255, 255, 0.12);
  }

  .nils-stat-value {
    font-size: clamp(1.35rem, 1.1rem + 1vw, 1.85rem);
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.02em;
    line-height: 1.1;
  }

  .nils-stat-label {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.7);
    margin-block-start: 0.2rem;
  }

  .nils-hero-showcase {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .nils-banner-frame {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.45);
    transition: transform 220ms var(--ease-out);
  }

  .nils-banner-frame img {
    width: 100%;
    height: auto;
    display: block;
  }

  /* 4. Quick-Access Digital Portals Grid (8 Official Portals) */
  .nils-portals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
    gap: 1.15rem;
  }

  .nils-portal-card {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    box-shadow: var(--shadow-xs);
    transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out), border-color 180ms ease;
    /* Staggered entry */
    opacity: 0;
    transform: translateY(8px);
    animation: nilsStaggerIn 260ms var(--ease-out) forwards;
  }

  .nils-portal-card:nth-child(1) { animation-delay: 0ms; }
  .nils-portal-card:nth-child(2) { animation-delay: 40ms; }
  .nils-portal-card:nth-child(3) { animation-delay: 80ms; }
  .nils-portal-card:nth-child(4) { animation-delay: 120ms; }
  .nils-portal-card:nth-child(5) { animation-delay: 160ms; }
  .nils-portal-card:nth-child(6) { animation-delay: 200ms; }
  .nils-portal-card:nth-child(7) { animation-delay: 240ms; }
  .nils-portal-card:nth-child(8) { animation-delay: 280ms; }

  @keyframes nilsStaggerIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nils-portal-card:active {
    transform: scale(0.98);
  }

  .nils-portal-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: var(--nils-blue-soft);
    color: var(--nils-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    transition: background-color 180ms ease, color 180ms ease, transform 180ms var(--ease-out);
  }

  .nils-portal-body {
    flex: 1;
    min-width: 0;
  }

  .nils-portal-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin-block-end: 0.2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .nils-portal-desc {
    font-size: 0.83rem;
    color: var(--text-muted);
    line-height: 1.45;
  }

  /* 5. Course Cards & Filter Controls */
  .nils-filter-bar {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-lg);
    padding: clamp(1rem, 2.5vw, 1.5rem);
    box-shadow: var(--shadow-sm);
    margin-block-end: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .nils-search-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .nils-input-wrap {
    position: relative;
    flex: 1;
    min-width: 240px;
  }

  .nils-input-icon {
    position: absolute;
    inset-inline-start: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
  }

  .nils-input {
    width: 100%;
    padding: 0.78rem 1rem 0.78rem 2.65rem;
    background: var(--bg-page);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    transition: border-color 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
    outline: none;
  }

  .nils-input:focus {
    background: var(--bg-surface);
    border-color: var(--nils-blue);
    box-shadow: 0 0 0 3px rgba(18, 67, 232, 0.14);
  }

  .nils-pills-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .nils-pill {
    padding: 0.48rem 1rem;
    border-radius: var(--radius-pill);
    font-size: 0.83rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-subtle);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 140ms var(--ease-out);
  }

  .nils-pill:active {
    transform: scale(0.96);
  }

  .nils-pill.active {
    background: var(--nils-navy);
    color: #ffffff;
  }

  /* Blur crossfade when filtering grid (emil-design-eng "Use blur to mask imperfect transitions") */
  .nils-course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 1.5rem;
    transition: opacity 180ms var(--ease-out), filter 180ms var(--ease-out);
  }

  .nils-course-grid.is-transitioning {
    opacity: 0.65;
    filter: blur(2px);
  }

  .nils-course-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xs);
    transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out), border-color 180ms ease;
    cursor: pointer;
  }

  .nils-course-card:active {
    transform: scale(0.985);
  }

  .nils-course-media {
    position: relative;
    background: var(--bg-subtle);
    aspect-ratio: 1 / 1;
    overflow: hidden;
  }

  .nils-course-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 280ms var(--ease-out);
  }

  .nils-course-badges {
    position: absolute;
    top: 0.85rem;
    inset-inline-start: 0.85rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    z-index: 2;
  }

  .nils-badge {
    padding: 0.28rem 0.7rem;
    border-radius: var(--radius-pill);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: rgba(10, 25, 47, 0.84);
    color: #ffffff;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  .nils-badge-accent {
    background: rgba(217, 119, 6, 0.92);
  }

  .nils-course-body {
    padding: 1.35rem;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0.65rem;
  }

  .nils-course-title {
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.32;
    letter-spacing: -0.012em;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .nils-course-desc {
    font-size: 0.87rem;
    color: var(--text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .nils-course-meta {
    margin-block-start: auto;
    padding-block-start: 0.85rem;
    border-block-start: 1px solid var(--border-hairline);
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.82rem;
    color: var(--text-muted);
  }

  .nils-course-meta-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .nils-course-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-block-start: 0.65rem;
  }

  .nils-price {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--nils-navy);
    letter-spacing: -0.015em;
  }

  .nils-price.is-free {
    color: var(--nils-emerald);
  }

  /* 6. Four Core Divisions / Services Cards */
  .nils-services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(275px, 1fr));
    gap: 1.5rem;
  }

  .nils-service-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out);
  }

  .nils-service-media {
    aspect-ratio: 16 / 10;
    background: var(--nils-navy);
    overflow: hidden;
  }

  .nils-service-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 280ms var(--ease-out);
  }

  .nils-service-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0.75rem;
  }

  /* 7. Callout Banners (Vacancies & Training Calendar) */
  .nils-cta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
  }

  .nils-cta-card {
    position: relative;
    border-radius: var(--radius-lg);
    padding: clamp(1.75rem, 3.5vw, 2.5rem);
    color: #ffffff;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1.25rem;
    box-shadow: var(--shadow-md);
  }

  .nils-cta-card.navy {
    background: linear-gradient(135deg, #0a192f 0%, #1e3a8a 100%);
  }

  .nils-cta-card.blue {
    background: linear-gradient(135deg, #1243e8 0%, #1d4ed8 100%);
  }

  .nils-cta-card h3 {
    color: #ffffff;
    font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.65rem);
  }

  .nils-cta-card p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
  }

  /* 8. Page Hero Banner for Subpages */
  .nils-page-hero {
    background: linear-gradient(135deg, #0a192f 0%, #172554 100%);
    color: #ffffff;
    padding-block: clamp(2.5rem, 5vw, 4rem);
    border-block-end: 3px solid var(--nils-gold-bright);
  }

  .nils-page-hero h1 {
    color: #ffffff;
    margin-block-top: 0.5rem;
  }

  .nils-page-hero p {
    color: rgba(255, 255, 255, 0.82);
    margin-block-top: 0.65rem;
    font-size: 1.05rem;
  }

  .nils-breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: #fcd34d;
  }

  .nils-breadcrumb a {
    color: rgba(255, 255, 255, 0.75);
    transition: color 150ms ease;
  }

  /* 9. Content Cards, Tables & Lists for Subpages */
  .nils-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-lg);
    padding: clamp(1.5rem, 3vw, 2.25rem);
    box-shadow: var(--shadow-sm);
  }

  .nils-grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
  }

  .nils-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
  }

  .nils-check-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .nils-check-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
  }

  .nils-check-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--nils-blue-soft);
    color: var(--nils-blue);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    flex-shrink: 0;
    margin-block-start: 0.15rem;
  }

  /* Faculty Directory Cards */
  .nils-faculty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 1rem;
    transition: opacity 180ms var(--ease-out), filter 180ms var(--ease-out);
  }

  .nils-faculty-grid.is-transitioning {
    opacity: 0.65;
    filter: blur(2px);
  }

  .nils-faculty-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-md);
    padding: 1.15rem 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    box-shadow: var(--shadow-xs);
    transition: transform 180ms var(--ease-out), box-shadow 180ms var(--ease-out);
  }

  .nils-avatar {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--nils-blue-soft);
    color: var(--nils-blue);
    font-weight: 800;
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0; /* ui-cheatsheet: never squish avatar into an oval */
  }

  /* Editorial Article & Blog Layout (65ch reading measure, tabular dates) */
  .nils-blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
    gap: 1.5rem;
  }

  .nils-blog-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xs);
    transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out), border-color 180ms ease;
  }

  .nils-blog-card:active {
    transform: scale(0.985);
  }

  .nils-blog-media {
    aspect-ratio: 16 / 10;
    background: var(--bg-subtle);
    overflow: hidden;
    position: relative;
  }

  .nils-blog-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 280ms var(--ease-out);
  }

  .nils-blog-body {
    padding: 1.4rem;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0.65rem;
  }

  .nils-article-shell {
    max-width: 820px;
    margin-inline: auto;
  }

  .nils-article-content {
    font-size: 1.04rem;
    line-height: 1.72;
    color: var(--text-secondary);
  }

  .nils-article-content > * + * {
    margin-block-start: 1.25rem;
  }

  .nils-article-content :is(h2, h3, h4) {
    color: var(--text-primary);
    margin-block-start: 2rem;
    margin-block-end: 0.65rem;
  }

  .nils-article-content :is(ul, ol) {
    padding-inline-start: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
  }

  .nils-article-content a {
    color: var(--nils-blue);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  .nils-article-content img,
  .nils-article-content video,
  .nils-article-content iframe {
    border-radius: var(--radius-md);
    border: 1px solid var(--border-hairline);
    box-shadow: var(--shadow-sm);
    margin-block: 1.5rem;
    max-width: 100%;
    height: auto;
  }

  /* Native <details> Accordion Disclosures (modern-web-guidance: html §5) */
  details.nils-disclosure {
    background: var(--bg-surface);
    border: 1px solid var(--border-hairline);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-xs);
    transition: border-color 160ms ease, box-shadow 160ms ease;
  }

  details.nils-disclosure + details.nils-disclosure {
    margin-block-start: 0.75rem;
  }

  details.nils-disclosure[open] {
    border-color: rgba(18, 67, 232, 0.28);
    box-shadow: var(--shadow-sm);
  }

  details.nils-disclosure > summary {
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    padding-block: 0.2rem;
  }

  details.nils-disclosure::details-content {
    padding-block-start: 0.85rem;
    color: var(--text-secondary);
  }

  /* Focus boundary for background content while modal/drawer is open (modern-web-guidance: html §6) */
  [inert], [inert] * {
    user-select: none;
    pointer-events: none;
  }

  /* 10. Modal Dialog & Toast (transform-origin: center, @starting-style, spatial consistency) */
  .nils-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    z-index: 4000;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .nils-modal-backdrop.is-open {
    display: flex;
  }

  .nils-modal {
    background: var(--bg-surface);
    width: 100%;
    max-width: 680px;
    border-radius: var(--radius-xl);
    padding: clamp(1.5rem, 3vw, 2.25rem);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-hairline);
    position: relative;
    margin: auto;
    transform-origin: center;
    opacity: 1;
    transform: scale(1) translateY(0);
    transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out);
    @starting-style {
      opacity: 0;
      transform: scale(0.95) translateY(10px);
    }
  }

  .nils-modal-close {
    position: absolute;
    top: 1.15rem;
    inset-inline-end: 1.15rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-hairline);
    background: var(--bg-subtle);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 140ms var(--ease-out), background-color 150ms ease, color 150ms ease;
  }

  .nils-modal-close:active {
    transform: scale(0.92);
  }

  /* Sonner-inspired Toast */
  .nils-toast {
    position: fixed;
    bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%) translateY(120%) scale(0.95);
    background: var(--nils-navy);
    color: #ffffff;
    padding: 0.75rem 1.35rem;
    border-radius: var(--radius-pill);
    font-size: 0.86rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.14);
    opacity: 0;
    pointer-events: none;
    transition: transform 220ms var(--ease-out), opacity 220ms var(--ease-out);
    z-index: 6000;
  }

  .nils-toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }

  /* 11. Footer */
  .nils-footer {
    background: var(--nils-navy);
    color: rgba(255, 255, 255, 0.78);
    padding-block: clamp(3rem, 5vw, 4.5rem) calc(2rem + env(safe-area-inset-bottom, 0px));
    border-block-start: 4px solid var(--nils-gold-bright);
    margin-block-start: 4rem;
  }

  .nils-footer-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(3, 1fr);
    gap: 2.25rem;
    padding-block-end: 2.5rem;
    border-block-end: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nils-footer h4 {
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-block-end: 1rem;
  }

  .nils-footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    font-size: 0.88rem;
  }

  .nils-footer-links a {
    color: rgba(255, 255, 255, 0.74);
    transition: color 150ms ease;
  }

  .nils-footer-bottom {
    padding-block-start: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.6);
  }

  /* 12. Capability-Gated Hover States (mobile-native §1 & emil-design-eng) */
  @media (hover: hover) and (pointer: fine) {
    .nils-gov-links a:hover,
    .nils-breadcrumb a:hover,
    .nils-footer-links a:hover {
      color: #ffffff;
    }

    .nils-nav-link:hover:not(.active) {
      color: var(--text-primary);
      background: var(--bg-subtle);
    }

    .nils-nav-item:hover > .nils-dropdown {
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
      transform: scale(1) translateY(0);
    }

    .nils-nav-item:hover .nils-nav-chevron {
      transform: rotate(180deg);
    }

    .nils-dropdown-link:hover {
      background: var(--bg-subtle);
      color: var(--nils-blue);
    }

    .nils-btn-primary:hover {
      background: var(--nils-blue-hover);
      transform: translateY(-1px);
    }

    .nils-btn-secondary:hover {
      background: var(--bg-subtle);
      border-color: rgba(15, 23, 42, 0.25);
    }

    .nils-btn-gold:hover {
      background: #fbbf24;
      transform: translateY(-1px);
    }

    .nils-btn-ghost:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    .nils-portal-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(18, 67, 232, 0.25);
    }

    .nils-portal-card:hover .nils-portal-icon {
      background: var(--nils-blue);
      color: #ffffff;
      transform: scale(1.05);
    }

    .nils-course-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(18, 67, 232, 0.22);
    }

    .nils-course-card:hover .nils-course-media img,
    .nils-service-card:hover .nils-service-media img,
    .nils-blog-card:hover .nils-blog-media img {
      transform: scale(1.03);
    }

    .nils-service-card:hover,
    .nils-blog-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(18, 67, 232, 0.22);
    }

    .nils-pill:hover:not(.active) {
      background: #e2e8f0;
      color: var(--text-primary);
    }

    .nils-faculty-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
      border-color: rgba(18, 67, 232, 0.22);
    }

    .nils-modal-close:hover {
      background: #e2e8f0;
      color: var(--text-primary);
    }
  }

  /* 13. Responsive Breakpoints */
  @media (max-width: 1024px) {
    .nils-nav {
      display: none;
    }
    .nils-burger {
      display: inline-flex;
    }
    .nils-hero-grid {
      grid-template-columns: 1fr;
    }
    .nils-footer-grid {
      grid-template-columns: 1fr 1fr;
    }
  }

  @media (max-width: 640px) {
    .nils-gov-links .hide-mobile {
      display: none;
    }
    .nils-brand-subtitle {
      display: none;
    }
    .nils-hero-stats {
      grid-template-columns: 1fr 1fr;
    }
    .nils-footer-grid {
      grid-template-columns: 1fr;
    }
    .nils-header-actions .hide-mobile {
      display: none;
    }
  }

  /* 14. Sensory & Accessibility Preferences (apple-design §14 & modern-web-guidance: motion) */
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
    .nils-portal-card {
      animation: none;
      opacity: 1;
      transform: none;
    }
    .nils-btn,
    .nils-pill,
    .nils-portal-card,
    .nils-course-card,
    .nils-service-card,
    .nils-faculty-card,
    .nils-dropdown,
    .nils-drawer,
    .nils-modal,
    .nils-toast {
      transition: opacity 150ms ease, background-color 150ms ease, color 150ms ease, border-color 150ms ease !important;
      transform: none !important;
    }
    .nils-toast {
      transform: translateX(-50%) !important;
    }
    .nils-drawer:not(.is-open) {
      display: none;
    }
    .nils-drawer-backdrop.is-open .nils-drawer {
      display: flex;
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .nils-header {
      background: #ffffff !important;
      backdrop-filter: none !important;
      -webkit-backdrop-filter: none !important;
    }
    .nils-badge {
      background: var(--nils-navy) !important;
      backdrop-filter: none !important;
    }
  }

  @media (prefers-contrast: more) {
    :root {
      --border-hairline: rgba(15, 23, 42, 0.35);
      --border-strong: rgba(15, 23, 42, 0.65);
    }
  }
}