/* =========================================================
   Genesee Learning Lab — Shared Site Stylesheet
   styles.css
   ========================================================= */

/* ---------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   --------------------------------------------------------- */
:root {
  /* Colors */
  --color-primary:       #1d4ed8; /* deep blue */
  --color-primary-dark:  #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-accent:        #0ea5e9; /* sky blue */
  --color-accent-dark:   #0284c7;
  --color-success:       #16a34a;
  --color-warning:       #d97706;

  --color-bg:            #f1f5f9;
  --color-surface:       #ffffff;
  --color-surface-alt:   #f8fafc;
  --color-border:        #e2e8f0;
  --color-text:          #0f172a;
  --color-text-muted:    #475569;
  --color-text-inverse:  #f8fafc;

  --color-hero-start:    #0f172a;
  --color-hero-end:      #1e3a8a;

  /* Typography */
  --font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --font-size-xs:   0.75rem;   /* 12px */
  --font-size-sm:   0.875rem;  /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg:   1.125rem;  /* 18px */
  --font-size-xl:   1.25rem;   /* 20px */
  --font-size-2xl:  1.5rem;    /* 24px */
  --font-size-3xl:  1.875rem;  /* 30px */
  --font-size-4xl:  2.25rem;   /* 36px */
  --font-size-5xl:  3rem;      /* 48px */

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm:   0.375rem;
  --radius-md:   0.75rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 8px 24px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.06);
  --shadow-xl:  0 16px 40px rgba(0,0,0,.15);

  /* Navigation */
  --nav-height: 4rem;
  --nav-bg:     #0f172a;
  --nav-border: #1e293b;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Max widths */
  --max-width-sm:   640px;
  --max-width-md:   768px;
  --max-width-lg:   1024px;
  --max-width-xl:   1280px;
  --max-width-site: 1200px;
}

/* ---------------------------------------------------------
   Reset & Base
   --------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

/* ---------------------------------------------------------
   Skip-to-Content Link (Accessibility)
   --------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 0;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: 9999;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text-inverse);
  font-weight: 800;
  font-size: var(--font-size-lg);
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-brand:hover {
  color: var(--color-accent);
}

.nav-brand-icon {
  width: 2rem;
  height: 2rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  font-weight: 900;
  color: #fff;
  flex-shrink: 0;
}

/* Desktop nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-4);
  color: #cbd5e1;
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  letter-spacing: 0.02em;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: #fff;
  background: rgba(255,255,255,.08);
  outline: none;
}

.nav-links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav-links a[aria-current="page"] {
  color: #fff;
  background: var(--color-primary);
}

/* Hamburger toggle (mobile) */
.nav-toggle {
  display: none;
  background: none;
  border: 2px solid #475569;
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  cursor: pointer;
  color: #cbd5e1;
  line-height: 1;
  font-size: 1.4rem;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
  color: #fff;
  outline: none;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Mobile nav drawer */
@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    padding: var(--space-4) var(--space-4) var(--space-6);
    gap: var(--space-2);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
  }
}

/* ---------------------------------------------------------
   Page Layout Containers
   --------------------------------------------------------- */
.container {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--sm {
  max-width: var(--max-width-md);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section--alt {
  background: var(--color-surface);
}

.section--dark {
  background: var(--color-hero-start);
  color: var(--color-text-inverse);
}

/* ---------------------------------------------------------
   Page Header (for inner pages)
   --------------------------------------------------------- */
.page-header {
  background: linear-gradient(135deg, var(--color-hero-start) 0%, var(--color-hero-end) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-16) 0;
  text-align: center;
}

.page-header h1 {
  margin: 0 0 var(--space-4);
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-header p {
  margin: 0 auto;
  max-width: 640px;
  font-size: var(--font-size-lg);
  color: #94a3b8;
}

/* ---------------------------------------------------------
   Hero Section
   --------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--color-hero-start) 0%, #1e3a8a 60%, #1d4ed8 100%);
  color: var(--color-text-inverse);
  padding: var(--space-24) 0 var(--space-20);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-6);
  text-align: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(59,130,246,.2);
  border: 1px solid rgba(59,130,246,.4);
  color: #93c5fd;
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__title {
  margin: 0 0 var(--space-6);
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero__title span {
  background: linear-gradient(90deg, #60a5fa, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  margin: 0 auto var(--space-10);
  max-width: 680px;
  font-size: var(--font-size-xl);
  line-height: 1.6;
  color: #94a3b8;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

/* ---------------------------------------------------------
   Buttons
   --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 700;
  font-family: var(--font-family);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast), transform var(--transition-fast),
              box-shadow var(--transition-fast);
  line-height: 1;
}

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn--secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.4);
}

.btn--secondary:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.7);
  color: #fff;
  transform: translateY(-1px);
  text-decoration: none;
}

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

.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

/* ---------------------------------------------------------
   Section Headers
   --------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header__eyebrow {
  display: inline-block;
  background: #eff6ff;
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
  border: 1px solid #bfdbfe;
}

.section-header h2 {
  margin: 0 0 var(--space-4);
  font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-4xl));
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.section-header p {
  margin: 0 auto;
  max-width: 600px;
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

/* Dark variant for section header on dark backgrounds */
.section--dark .section-header__eyebrow {
  background: rgba(59,130,246,.15);
  color: #93c5fd;
  border-color: rgba(59,130,246,.3);
}

.section--dark .section-header h2 {
  color: var(--color-text-inverse);
}

.section--dark .section-header p {
  color: #94a3b8;
}

/* ---------------------------------------------------------
   Cards
   --------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.card__icon {
  width: 3rem;
  height: 3rem;
  background: #eff6ff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}

.card h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.card p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ---------------------------------------------------------
   Callout / CTA Sections
   --------------------------------------------------------- */
.callout {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-8);
  text-align: center;
}

.callout h2 {
  margin: 0 0 var(--space-4);
  font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-3xl));
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
}

.callout p {
  margin: 0 auto var(--space-8);
  max-width: 560px;
  font-size: var(--font-size-lg);
  color: #bfdbfe;
}

/* ---------------------------------------------------------
   Tags / Pills
   --------------------------------------------------------- */
.status-pill {
  display: inline-block;
  margin-left: var(--space-2);
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  line-height: 1.4;
  vertical-align: middle;
  border: 1px solid transparent;
}

.status-prod {
  background: #dcfce7;
  color: #166534;
  border-color: #86efac;
}

.status-progress {
  background: #fef3c7;
  color: #92400e;
  border-color: #fcd34d;
}

/* ---------------------------------------------------------
   Project List Styles (shared with projects.html)
   --------------------------------------------------------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}

.project-card h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--font-size-base);
}

.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.project-list li + li {
  margin-top: var(--space-3);
}

.project-list a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.project-list a:hover,
.project-list a:focus-visible {
  text-decoration: underline;
}

.item-desc {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.45;
}

.group-label {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.instructional-note {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #f8fbff;
}

.instructional-note p {
  margin: 0 0 var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.55;
}

.instructional-note p:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
  background: var(--color-hero-start);
  color: #94a3b8;
  padding: var(--space-12) 0 var(--space-8);
}

.footer-inner {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid #1e293b;
}

.footer-brand {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: #fff;
  margin-bottom: var(--space-3);
}

.footer-tagline {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: #64748b;
  max-width: 280px;
}

.footer-col h4 {
  color: #e2e8f0;
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 var(--space-4);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col a {
  color: #64748b;
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #cbd5e1;
}

.footer-bottom {
  padding-top: var(--space-6);
  font-size: var(--font-size-sm);
  color: #475569;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------
   Utility Classes
   --------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

.text-center { text-align: center; }
.text-muted   { color: var(--color-text-muted); }
.mt-4  { margin-top: var(--space-4); }
.mt-8  { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-8  { margin-bottom: var(--space-8); }