/* ==========================================================================
   Layout — shell, editorial grid, topbar, kerangka section
   ========================================================================== */

.shell {
  width: min(100% - var(--gutter) * 2, var(--shell));
  margin-inline: auto;
}

main {
  position: relative;
}

.sect {
  padding-block: var(--sect-y);
  border-top: 1px solid var(--border-subtle);
}

.sect--tight {
  padding-block: clamp(3rem, 7vh, 5.5rem);
}

/* Section fills use tonal layering (surface shifts), never a hard color
   swap — the seam is a thin technical rule, not a band. */
#capabilities {
  background: var(--surface-low);
}

.sect--sage {
  background: var(--sage-light);
  border-top: 1px solid var(--border-accent);
  border-bottom: 1px solid var(--border-accent);
}

.sect--dark {
  color: var(--on-charcoal);
  background: var(--charcoal);
  border-top-color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--foreground-muted);
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 0.5rem;
  width: fit-content;
}

.sect--dark .eyebrow {
  color: rgba(255, 255, 255, 0.6);
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.eyebrow--accent {
  color: var(--brand-dark);
  border-bottom-color: var(--border-accent);
}

.sect__head {
  display: grid;
  gap: 1.1rem;
  max-width: 58ch;
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.lead {
  font-size: var(--t-lead);
  line-height: 1.6;
  color: var(--foreground-secondary);
}

.muted {
  color: var(--foreground-muted);
}

.note {
  font-size: var(--t-small);
  color: var(--foreground-muted);
}

/* --- Topbar -------------------------------------------------------------- */

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem var(--gutter);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease-out),
    backdrop-filter var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out);
}

.topbar.is-stuck {
  background: var(--background);
  background: color-mix(in srgb, var(--background) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border-subtle);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.brand__mark {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--r-sm);
  object-fit: cover;
  flex: none;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand__name-a {
  font-weight: 700;
  color: var(--foreground);
}

.brand__name-b {
  font-weight: 300;
  color: var(--brand-dark);
}

.sect--dark .brand__name-a {
  color: var(--on-charcoal);
}

.topnav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2rem);
  font-size: var(--t-small);
  font-weight: 500;
}

.topnav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2rem);
}

.topnav__links a {
  position: relative;
  color: var(--foreground-secondary);
  transition: color var(--dur-fast) var(--ease-out);
}

.topnav__links a:hover {
  color: var(--brand-dark);
}

.topnav__toggle {
  display: none;
  padding: 0.5rem;
  border-radius: var(--r-sm);
}

.topnav__toggle-icon {
  display: block;
  width: 20px;
  height: 14px;
  position: relative;
}

.topnav__toggle-icon span,
.topnav__toggle-icon span::before,
.topnav__toggle-icon span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease-out), opacity var(--dur) var(--ease-out);
}

.topnav__toggle-icon span {
  top: 50%;
  transform: translateY(-50%);
}

.topnav__toggle-icon span::before {
  top: -6px;
}

.topnav__toggle-icon span::after {
  top: 6px;
}

.topbar.is-open .topnav__toggle-icon span {
  background: transparent;
}

.topbar.is-open .topnav__toggle-icon span::before {
  top: 0;
  transform: rotate(45deg);
}

.topbar.is-open .topnav__toggle-icon span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Aturan dasar sengaja ditulis SEBELUM media query: spesifisitas sama, jadi
   deklarasi terakhir menang dan display:none berlaku di mobile. */
@media (max-width: 720px) {
  .topnav__links {
    display: none;
  }

  /* The mobile drawer already repeats this CTA — showing both it and the
     hamburger side by side crowds/overflows on narrow phones.
     Specificity note: `.btn` (components.css, loaded after this file) sets
     display:inline-flex at equal specificity — a bare .topnav__cta would
     lose to it on source order. The extra `a` tips specificity in our favor
     regardless of file load order. */
  a.topnav__cta {
    display: none;
  }

  .topnav__toggle {
    display: inline-flex;
    min-width: 2.75rem;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
  }

  .topbar.is-open .mobile-menu {
    display: flex;
  }
}

.mobile-menu {
  display: none;
  position: fixed;
  inset: var(--topbar-height, 4.6rem) 0 auto;
  z-index: 39;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem var(--gutter) 1.5rem;
  /* Solid fallback first: on browsers without color-mix() support, this is
     the declaration that sticks — without it the panel falls through to
     transparent and whatever's scrolled behind (hero/dark section) shows
     through instead, looking like a random-colored, unreadable menu. */
  background: var(--background);
  background: color-mix(in srgb, var(--background) 97%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  font-size: var(--t-lead);
}

.mobile-menu a:not(.btn) {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--foreground);
}

/* --- Grid helpers ---------------------------------------------------------- */

.editorial-grid {
  display: grid;
  gap: 1.5rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

.actions--center {
  justify-content: center;
}