/* ============================================
   UCognify Design System
   Human-Centered AI — Dark Aurora Theme
   ============================================ */

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

:root {
  /* Brand Colors — Dark Aurora */
  --color-ink: #e2e8f0;
  --color-ink-light: #94a3b8;
  --color-ink-muted: #64748b;
  --color-surface: #0a0e17;
  --color-surface-warm: #111827;
  --color-surface-alt: #1a2235;
  --color-accent: #4f8aff;
  --color-accent-hover: #3b6fdb;
  --color-accent-light: rgba(79, 138, 255, 0.12);
  --color-teal: #34d399;
  --color-teal-light: rgba(52, 211, 153, 0.12);
  --color-navy: #1a2235;
  --color-white: #e2e8f0;
  --color-border: #2a3650;
  --color-border-light: #1e2d45;
  --color-card-bg: #1a2235;
  --color-input-bg: #0d1321;

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-reading: 680px;
  --nav-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-surface);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.15rem; }

p {
  max-width: 65ch;
  margin-bottom: var(--space-md);
  color: var(--color-ink-light);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--color-accent-hover); }

strong { color: var(--color-ink); font-weight: 600; }

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--reading {
  max-width: var(--max-width-reading);
}

.section {
  padding: var(--space-3xl) 0;
}

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

.section--navy {
  background: var(--color-navy);
  color: var(--color-white);
}

.section--navy h2,
.section--navy h3,
.section--navy h4 {
  color: var(--color-white);
}

.section--navy p {
  color: rgba(226, 232, 240, 0.8);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.03em;
  text-decoration: none;
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav__links a {
  color: var(--color-ink-light);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-ink);
}

.nav__links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav__cta {
  background: var(--color-accent) !important;
  color: var(--color-white) !important;
  padding: 0.5rem 1.2rem !important;
  border-radius: var(--radius) !important;
  font-weight: 600 !important;
  font-size: 0.88rem !important;
  transition: background var(--transition) !important;
}

.nav__cta:hover {
  background: var(--color-accent-hover) !important;
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  margin: 5px 0;
  transition: var(--transition);
}

/* --- Hero --- */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-ink-muted);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

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

/* --- Page Header (inner pages) --- */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-2xl);
  text-align: center;
  background: var(--color-surface-warm);
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header__subtitle {
  font-size: 1.15rem;
  color: var(--color-ink-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
  gap: var(--space-sm);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 138, 255, 0.3);
}

.btn--secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  background: var(--color-card-bg);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  padding: 0.5rem 0;
}

.btn--ghost:hover {
  color: var(--color-accent-hover);
}

.btn--ghost::after {
  content: ' →';
}

.btn--large {
  padding: 1rem 2.2rem;
  font-size: 1.05rem;
}

.btn--white {
  background: var(--color-card-bg);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.btn--white:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 138, 255, 0.15);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

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

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(79, 138, 255, 0.1);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
}

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

.card__icon--teal {
  background: var(--color-teal-light);
  color: var(--color-teal);
}

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

.card p {
  font-size: 0.95rem;
}

/* --- Feature List --- */
.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  padding: var(--space-sm) 0;
  padding-left: 1.8rem;
  position: relative;
  color: var(--color-ink-light);
  line-height: 1.6;
}

.feature-list li::before {
  content: '✦';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
  top: 0.7rem;
}

/* --- Dimensions Grid --- */
.dimension-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.dimension {
  padding: var(--space-lg);
  border-left: 3px solid var(--color-accent);
  background: var(--color-card-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.dimension h4 {
  margin-bottom: var(--space-xs);
  color: var(--color-ink);
}

.dimension p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* --- Process Steps --- */
.steps {
  counter-reset: step;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.step {
  counter-increment: step;
  position: relative;
  padding-left: 4rem;
  padding-bottom: var(--space-xl);
  border-left: 2px solid var(--color-border-light);
  margin-left: 1.25rem;
}

.step:last-child {
  border-left: 2px solid transparent;
  padding-bottom: 0;
}

.step::before {
  content: counter(step);
  position: absolute;
  left: -1.35rem;
  top: 0;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.step h4 {
  margin-bottom: var(--space-xs);
}

.step p {
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* --- Testimonial / Pull Quote --- */
.pullquote {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-style: italic;
  color: var(--color-ink);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-lg);
  max-width: 600px;
  margin: var(--space-2xl) auto;
  line-height: 1.6;
}

/* --- Program / Week Grid --- */
.program-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.program-week {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.program-week::before {
  content: attr(data-week);
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent-light);
  line-height: 1;
}

.program-week h4 {
  margin-bottom: var(--space-sm);
}

.program-week p {
  font-size: 0.92rem;
  position: relative;
  z-index: 1;
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.cta-section h2 {
  margin-bottom: var(--space-md);
}

.cta-section p {
  margin: 0 auto var(--space-xl);
  max-width: 500px;
}

/* --- Footer --- */
.footer {
  margin-top: auto;
  background: #060a12;
  color: rgba(226, 232, 240, 0.7);
  padding: var(--space-2xl) 0;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
}

.footer__brand {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.footer__brand span {
  color: var(--color-accent);
}

.footer__tagline {
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

.footer h4 {
  color: var(--color-white);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer__links {
  list-style: none;
}

.footer__links li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  transition: color var(--transition);
  text-decoration: none;
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__bottom {
  max-width: var(--max-width);
  margin: var(--space-xl) auto 0;
  padding: var(--space-lg) var(--space-xl) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2.5rem;
    --space-3xl: 3.5rem;
    --space-4xl: 5rem;
  }

  .nav__links { display: none; }
  .nav__toggle { display: block; }

  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  }

  .hero { text-align: left; }
  .hero__actions { justify-content: flex-start; }

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

  .card-grid {
    grid-template-columns: 1fr;
  }

  .dimension-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mx-auto { margin-left: auto; margin-right: auto; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- Pricing Cards --- */
.pricing-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  max-width: 600px;
  margin: 0 auto;
}

.pricing-card--featured {
  border-color: var(--color-accent);
  box-shadow: 0 4px 24px rgba(224, 122, 58, 0.12);
}

.pricing-card__header {
  margin-bottom: var(--space-lg);
}

.pricing-card__header h2,
.pricing-card__header h3 {
  margin-bottom: var(--space-xs);
}

.pricing-card__tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0;
}

.pricing-card__price {
  margin-bottom: var(--space-lg);
}

.pricing-card__amount {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.03em;
}

.pricing-card__period {
  display: block;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  margin-top: var(--space-xs);
}

.pricing-card__description {
  margin-bottom: var(--space-lg);
  max-width: none;
}

.pricing-card__features {
  list-style: none;
  margin-bottom: var(--space-xl);
}

.pricing-card__features li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: var(--space-sm);
  color: var(--color-ink-light);
  line-height: 1.5;
}

.pricing-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-teal);
  font-weight: 700;
}

.pricing-card__note {
  font-size: 0.88rem;
  color: var(--color-ink-muted);
  font-style: italic;
  margin-bottom: var(--space-lg);
  max-width: none;
}

.btn--full {
  display: block;
  width: 100%;
  text-align: center;
}

/* --- FAQ --- */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-lg) 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}

.faq-item p {
  max-width: none;
  margin-bottom: 0;
  color: var(--color-ink-light);
}