/* ===================================================================
   Layout — shell, navigation dock, grid helpers, footer
   =================================================================== */

.container {
  width: min(1180px, 92vw);
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: var(--sp-6);
  z-index: 2;
}

.section--tight {
  padding-block: var(--sp-5);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  max-width: 46rem;
  margin-bottom: var(--sp-5);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-accent);
  background: var(--c-accent-soft);
  border: 1px solid var(--c-border);
  padding: 0.4rem 1rem;
  border-radius: var(--r-pill);
}

.section-head--center .eyebrow {
  align-self: center;
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
}

/* ---------- Loading screen ---------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: var(--z-loader);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
  transition: opacity 0.6s var(--ease-glass), visibility 0.6s var(--ease-glass);
}
.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loader__mark {
  position: relative;
  width: 84px;
  height: 84px;
  perspective: 400px;
}
.loader__mark span {
  position: absolute;
  inset: 0;
  border-radius: 28% 72% 62% 38% / 42% 34% 66% 58%;
  border: 2px solid var(--c-accent);
  animation: loaderSpin 2.4s var(--ease-glass) infinite;
}
.loader__mark span:nth-child(2) {
  border-color: var(--c-teal);
  animation-delay: -0.8s;
}
.loader__mark span:nth-child(3) {
  border-color: var(--c-gold);
  animation-delay: -1.6s;
}

/* ---------- Top navigation capsule ---------- */
.site-header {
  position: fixed;
  top: var(--sp-3);
  right: 0;
  left: 0;
  z-index: var(--z-nav);
  display: flex;
  justify-content: center;
  pointer-events: none;
}

.nav-capsule {
  pointer-events: all;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  width: min(1180px, 94vw);
  padding: 0.7rem 0.9rem 0.7rem 1.4rem;
  background: var(--c-surface);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border: 1px solid var(--c-border);
  border-radius: var(--r-pill);
  box-shadow: 0 18px 50px -22px rgba(var(--c-shadow), 0.45);
  transition: box-shadow var(--dur-med) var(--ease-glass), background var(--dur-med) var(--ease-glass);
}

.site-header.is-scrolled .nav-capsule {
  box-shadow: 0 22px 60px -18px rgba(var(--c-shadow), 0.55);
  background: var(--c-surface-strong);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.05rem;
  white-space: nowrap;
}

.brand__mark {
  width: 38px;
  height: 38px;
  border-radius: 30% 70% 65% 35% / 40% 45% 55% 60%;
  background: linear-gradient(135deg, var(--c-accent), var(--c-gold));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent-ink);
  font-weight: 900;
  transform-style: preserve-3d;
  transition: transform var(--dur-med) var(--ease-glass);
}
.brand:hover .brand__mark {
  transform: rotateY(180deg);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex: 1;
}

.nav-list a {
  position: relative;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--c-ink-soft);
  padding: 0.4rem 0.2rem;
  transition: color var(--dur-fast) var(--ease-glass);
}
.nav-list a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--c-accent);
  transition: width var(--dur-fast) var(--ease-glass);
}
.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--c-ink);
}
.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.theme-toggle svg {
  width: 19px;
  height: 19px;
  position: absolute;
  transition: transform var(--dur-med) var(--ease-glass), opacity var(--dur-med) var(--ease-glass);
}
.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(60deg) scale(0.5);
}
.theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-60deg) scale(0.5);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  background: var(--c-bg-soft);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.nav-toggle span {
  width: 16px;
  height: 2px;
  background: var(--c-ink);
  border-radius: var(--r-pill);
  transition: transform var(--dur-fast) var(--ease-glass), opacity var(--dur-fast) var(--ease-glass);
}
.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  background: var(--c-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: var(--sp-4);
  padding-top: calc(var(--sp-7) + var(--sp-3));
  padding-bottom: var(--sp-5);
  overflow-y: auto;
  transform: translateY(-100%);
  opacity: 0;
  transition: transform var(--dur-med) var(--ease-glass), opacity var(--dur-med) var(--ease-glass);
}
.mobile-drawer.is-open {
  transform: translateY(0);
  opacity: 1;
}
.mobile-drawer a {
  font-size: 1.6rem;
  font-weight: 700;
}

/* ---------- Progress dock (desktop, internal pages) ---------- */
.progress-dock {
  position: fixed;
  left: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  z-index: var(--z-nav);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.progress-dock span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-border-strong);
  transition: all var(--dur-fast) var(--ease-glass);
}
.progress-dock span.is-active {
  background: var(--c-accent);
  height: 22px;
  border-radius: var(--r-pill);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 2;
  padding-top: var(--sp-6);
}

.footer-cta {
  background: linear-gradient(145deg, var(--c-teal), #123b37);
  color: #f2f7f5;
  border-radius: var(--r-lg);
  padding: var(--sp-6) var(--sp-5);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.footer-cta::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(30rem 20rem at 80% 20%, rgba(255, 255, 255, 0.16), transparent 60%);
  z-index: -1;
}
.footer-cta h2 {
  font-size: var(--fs-h2);
  max-width: 30rem;
}

.footer-grid {
  padding-block: var(--sp-6);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--sp-4);
}
.footer-col h4 {
  font-size: 1rem;
  margin-bottom: var(--sp-3);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  color: var(--c-ink-soft);
}
.footer-col ul a:hover {
  color: var(--c-accent);
}
.footer-brand p {
  color: var(--c-ink-soft);
  margin-block: var(--sp-2);
  max-width: 22rem;
}
.footer-social {
  display: flex;
  gap: 0.6rem;
  margin-top: var(--sp-2);
}
.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--dur-fast) var(--ease-glass), background var(--dur-fast) var(--ease-glass);
}
.footer-social a:hover {
  background: var(--c-accent-soft);
  transform: translateY(-3px);
}
.footer-bottom {
  border-top: 1px solid var(--c-border);
  padding-block: var(--sp-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
  color: var(--c-ink-faint);
  font-size: var(--fs-small);
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: var(--sp-4);
  left: var(--sp-4);
  z-index: 40;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-surface-strong);
  backdrop-filter: blur(14px);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--dur-fast) var(--ease-glass);
  box-shadow: 0 14px 30px -14px rgba(var(--c-shadow), 0.4);
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav-list {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .progress-dock {
    display: none;
  }
}

@media (max-width: 620px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-cta {
    padding: var(--sp-4);
  }
}