/* ============================================================
   BETTER AI LEARNING — Site Styles
   ============================================================ */

/* ----- Custom Properties ----- */
:root {
  /* Colors */
  --primary:        #1d4ed8;
  --primary-dark:   #1e3a8a;
  --primary-light:  #3b82f6;
  --accent:         #059669;
  --accent-light:   #d1fae5;
  --ai-color:       #7c3aed;
  --ai-light:       #ede9fe;
  --warning:        #d97706;
  --warning-light:  #fef3c7;

  /* Neutrals */
  --surface:        #f8fafc;
  --surface-card:   #ffffff;
  --border:         #e2e8f0;
  --text-dark:      #0f172a;
  --text-body:      #334155;
  --text-muted:     #64748b;
  --text-faint:     #94a3b8;

  /* Hero / gradient */
  --hero-from:      #1e3a8a;
  --hero-to:        #1d4ed8;

  /* Spacing */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;
  --space-4xl:  6rem;

  /* Typography */
  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;

  /* Radii */
  --radius-sm:  0.375rem;
  --radius-md:  0.75rem;
  --radius-lg:  1.25rem;
  --radius-xl:  2rem;

  /* 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,.08), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.10), 0 4px 10px rgba(0,0,0,.06);

  /* Transitions */
  --transition: 200ms ease;

  /* Layout */
  --max-width: 1120px;
  --nav-height: 70px;
}

/* ----- Reset & Base ----- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-body);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

/* ----- Container ----- */
.container {
  width: min(var(--max-width), 100% - 2.5rem);
  margin-inline: auto;
}

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

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3 {
  font-family: var(--font-serif);
  line-height: 1.25;
  color: var(--text-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); font-weight: 700; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); font-weight: 700; }
h4 { font-size: 1.125rem; font-weight: 600; color: var(--text-dark); line-height: 1.35; }

.lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-body);
}

em { font-style: italic; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
  white-space: nowrap;
}

.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.55);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.85);
}

.btn--large {
  padding: 0.875rem 2rem;
  font-size: 1rem;
}

/* ============================================================
   BADGES & TAGS
   ============================================================ */
.eyebrow,
.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3em 0.85em;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-tag--ai {
  background: var(--ai-light);
  color: var(--ai-color);
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3em 0.8em;
  border-radius: 999px;
  vertical-align: middle;
}

.badge--available {
  background: var(--accent-light);
  color: var(--accent);
}

.badge--soon {
  background: var(--warning-light);
  color: var(--warning);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: background var(--transition);
}

.site-header:not(.scrolled) .brand-mark {
  background: rgba(255,255,255,.25);
}

.brand-text {
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  transition: color var(--transition);
}

.site-header.scrolled .brand-text { color: var(--text-dark); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,.85);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover { color: #fff; background: rgba(255,255,255,.1); }

.site-header.scrolled .nav-link       { color: var(--text-body); }
.site-header.scrolled .nav-link:hover { color: var(--primary); background: var(--surface); }

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav-cta:hover { background: var(--primary-dark) !important; }
.site-header.scrolled .nav-cta { background: var(--primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.site-header.scrolled .nav-toggle span { background: var(--text-dark); }

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
  background: linear-gradient(135deg, var(--hero-from) 0%, var(--hero-to) 60%, #2563eb 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(99,102,241,.25) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(16,185,129,.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-4xl) var(--space-3xl);
  max-width: 720px;
}

.hero .eyebrow {
  background: rgba(255,255,255,.18);
  color: rgba(255,255,255,.95);
  border: 1px solid rgba(255,255,255,.3);
}

.hero h1 {
  color: #fff;
  margin-block: 1rem 1.25rem;
}

.hero h1 em {
  color: rgba(255,255,255,.85);
  font-style: italic;
}

.hero-lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: rgba(255,255,255,.85);
  max-width: 580px;
  margin-bottom: var(--space-2xl);
}

.hero-lead strong { color: #fff; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-wave {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  pointer-events: none;
  line-height: 0;
}

.hero-wave svg { width: 100%; }

/* ============================================================
   TRUST BAR
   ============================================================ */
.trust-bar {
  background: var(--surface-card);
  border-bottom: 1px solid var(--border);
  padding-block: var(--space-xl);
}

.trust-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  text-align: center;
}

.trust-item strong {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.trust-item span {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.trust-divider {
  width: 1px;
  height: 2.5rem;
  background: var(--border);
  flex-shrink: 0;
}

/* ============================================================
   SECTIONS — common
   ============================================================ */
.section {
  padding-block: var(--space-4xl);
}

.services {
  background: var(--surface);
}

.about {
  background: var(--surface-card);
}

.ai-section {
  background: var(--surface-card);
}

.contact {
  background: var(--surface);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}

.section-header h2 { margin-block: 0.5rem 0.75rem; }

.section-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-body p + p { margin-top: var(--space-md); }
.about-body .lead { margin-bottom: var(--space-md); }

.about-pillars {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.pillar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-md);
  row-gap: 0.25rem;
  align-items: start;
}

.pillar-icon {
  font-size: 1.5rem;
  grid-row: 1 / 3;
  align-self: center;
  padding-top: 0.1rem;
}

.pillar h3 {
  font-size: 1rem;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--text-dark);
}

.pillar p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.service-card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--primary-light);
}

.service-icon {
  font-size: 2.25rem;
  margin-bottom: var(--space-md);
  line-height: 1;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   AI INITIATIVES
   ============================================================ */
.ai-featured {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3xl);
  align-items: center;
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  border: 1px solid #c4b5fd;
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.ai-featured-meta { margin-bottom: var(--space-md); }

.ai-featured-body h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--ai-color);
  margin-bottom: var(--space-md);
}

.ai-featured-body .lead {
  color: #3b1f8c;
  margin-bottom: var(--space-lg);
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: var(--space-xl);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: #4c1d95;
  font-weight: 500;
}

.feature-list li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  background: var(--ai-color);
  color: #fff;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 800;
  flex-shrink: 0;
}

.ai-featured-body .btn-primary {
  background: var(--ai-color);
  border-color: var(--ai-color);
}

.ai-featured-body .btn-primary:hover {
  background: #6d28d9;
  border-color: #6d28d9;
}

.ai-featured-visual { flex-shrink: 0; }

.visual-bubble {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 180px;
  height: 180px;
  background: var(--ai-color);
  border-radius: 50%;
  color: rgba(255,255,255,.9);
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
  padding: var(--space-md);
  box-shadow: 0 8px 32px rgba(124,58,237,.35);
}

.visual-emoji { font-size: 3rem; line-height: 1; }

/* Coming Soon */
.coming-soon { margin-top: var(--space-3xl); }

.coming-soon-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.coming-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.coming-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.coming-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.coming-icon { font-size: 1.75rem; line-height: 1; margin-bottom: 0.25rem; }

.coming-card h4 { color: var(--text-dark); }

.coming-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  max-width: 860px;
  margin-inline: auto;
}

.contact-card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  line-height: 1;
}

.contact-card h3 { margin-bottom: var(--space-sm); }

.contact-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.contact-email {
  display: inline-block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

.contact-email:hover { color: var(--primary-dark); }

.contact-cta p {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--text-dark);
  color: rgba(255,255,255,.7);
}

.footer-layout {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-2xl);
  align-items: center;
  padding-block: var(--space-2xl);
}

.footer-brand .brand-mark {
  background: var(--primary);
  color: #fff;
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,.55);
  max-width: 260px;
  line-height: 1.5;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-nav a {
  font-size: 0.88rem;
  color: rgba(255,255,255,.6);
  transition: color var(--transition);
}

.footer-nav a:hover { color: #fff; }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: right;
}

.footer-contact a {
  font-size: 0.88rem;
  color: rgba(255,255,255,.6);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

.footer-contact a:hover { color: #fff; }

.footer-contact span {
  font-size: 0.82rem;
  color: rgba(255,255,255,.35);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-block: var(--space-md);
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255,255,255,.35);
  text-align: center;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-layout,
  .services-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .services-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  }

  .coming-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .ai-featured {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .ai-featured-visual {
    display: flex;
    justify-content: center;
    order: -1;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .contact-cta { text-align: center; }

  .footer-layout {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }

  .footer-contact { text-align: center; }
  .footer-nav { align-items: center; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg);
    gap: var(--space-xs);
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 250ms ease, opacity 250ms ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    color: var(--text-body) !important;
    padding: 0.65rem 0.75rem;
    border-radius: var(--radius-sm);
  }

  .nav-link:hover {
    background: var(--surface) !important;
    color: var(--primary) !important;
  }

  .nav-cta {
    text-align: center;
    margin-top: var(--space-sm);
  }

  .trust-divider { display: none; }

  .trust-grid { gap: var(--space-lg); }

  .section { padding-block: var(--space-3xl); }
}

@media (max-width: 480px) {
  .hero-content { padding-block: var(--space-3xl) var(--space-2xl); }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .ai-featured { padding: var(--space-xl); }
}