/* ==========================================================================
   TEACHER LUPI — LAYOUT
   Grid system, containers, header, footer, responsive breakpoints
   ========================================================================== */

/* CONTAINER */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* MAIN */
.site-main {
  flex: 1;
  position: relative;
  z-index: var(--z-default);
}

/* PAGE WRAPPER */
.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --------------------------------------------------------------------------
   HEADER
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: var(--z-header);
  background: var(--color-backdrop);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-width) solid transparent;
  padding: var(--space-3) 0;
  transition: var(--transition-normal);
  animation: slide-down 0.6s var(--ease-bounce) forwards;
}

.site-header.is-scrolled {
  background: var(--color-backdrop);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--color-primary);
  box-shadow: 0 8px 30px var(--color-primary-soft);
  padding: var(--space-1) 0;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Brand */
.header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  text-decoration: none;
  color: var(--color-ink);
  padding: var(--space-2) var(--space-3);
  transition: var(--transition-bounce);
}

.header__brand-icon {
  width: 42px; height: 42px;
  background: var(--color-card);
  border: var(--neo-border);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--neo-shadow-xs);
  overflow: hidden;
  transition: var(--transition-bounce);
}

.header__brand-icon img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.header__brand:hover {
  background: var(--color-ink);
  color: var(--color-surface);
  transform: translateY(-3px);
  box-shadow: var(--neo-shadow-sm);
}

.header__brand:hover .header__brand-icon {
  transform: rotate(-5deg) scale(1.05);
  border-color: var(--color-primary);
}

/* Nav */
.header__nav {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.header__nav-link {
  font-weight: 700;
  font-size: var(--text-sm);
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  transition: var(--transition-fast);
  letter-spacing: var(--tracking-wide);
}

.header__nav-link:hover {
  background: var(--color-ink);
  color: var(--color-surface);
  transform: translateY(-3px);
  box-shadow: var(--neo-shadow-sm);
}

/* Header actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile menu button */
.header__mobile-btn {
  display: none;
  width: 44px; height: 44px;
  background: var(--color-ink);
  color: var(--color-surface);
  border: var(--neo-border);
  align-items: center;
  justify-content: center;
  box-shadow: var(--neo-shadow-xs);
}

.header__mobile-btn svg { width: 22px; height: 22px; }

/* --------------------------------------------------------------------------
   MOBILE NAV OVERLAY
   -------------------------------------------------------------------------- */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  z-index: var(--z-mobile-nav);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-slow) ease;
}

.mobile-nav.is-active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__close {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  border: 3px solid var(--color-surface);
  color: var(--color-surface);
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav__close svg { width: 24px; height: 24px; }

.mobile-nav__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  text-align: center;
}

.mobile-nav__links a {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  color: var(--color-surface);
  transition: var(--transition-fast);
}

.mobile-nav__links a:hover {
  color: var(--color-primary);
  transform: scale(1.05);
}

/* --------------------------------------------------------------------------
   STICKY CTA
   -------------------------------------------------------------------------- */
.sticky-cta {
  position: fixed;
  bottom: 0; left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  background: var(--color-backdrop);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: var(--neo-border-heavy);
  padding: var(--space-3) 0;
  transform: translateY(100%);
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.sticky-cta.is-visible { transform: translateY(0); }

.sticky-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.sticky-cta__text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  text-transform: uppercase;
  display: none;
}

/* --------------------------------------------------------------------------
   FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-surface);
  padding: var(--space-16) 0 var(--space-10);
  border-top: var(--neo-border-heavy);
  position: relative;
  z-index: var(--z-cards);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-10);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-surface);
  margin-bottom: var(--space-4);
}

.footer__brand-icon {
  width: 40px; height: 40px;
  border: var(--neo-border);
  border-color: var(--color-surface);
  overflow: hidden;
}

.footer__brand-icon img { width: 100%; height: 100%; object-fit: cover; }

.footer__heading {
  color: var(--color-primary);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.footer__link {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.footer__copy {
  opacity: 0.5;
  font-size: var(--text-xs);
  margin-top: var(--space-3);
}

.footer__bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.15);
  text-align: center;
  opacity: 0.6;
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   SECTION SPACING
   -------------------------------------------------------------------------- */
.section {
  padding: var(--section-gap) 0;
  scroll-margin-top: 100px;
}

.section__badge {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
  display: block;
}

/* --------------------------------------------------------------------------
   RESPONSIVE
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .site-header { padding: var(--space-2) 0; }
  .header__brand { font-size: var(--text-2xl); padding: var(--space-1) var(--space-2); }
  .header__brand-icon { width: 32px; height: 32px; }
  .header__nav,
  .header__actions .neo-btn { display: none; }
  .header__mobile-btn { display: flex; width: 38px; height: 38px; }
  .header__mobile-btn svg { width: 20px; height: 20px; }
  .sticky-cta__text { display: none; }
  .footer__grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

@media (max-width: 480px) {
  :root { --container-pad: var(--space-4); }
}