/* ==========================================================================
   AlphaSync Global — Global layout: container, section tones, header, footer
   ========================================================================== */

.container { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }

/* --- Section tones ------------------------------------------------------ */
.band { padding-block: var(--section-y); position: relative; }
.band--light { background: var(--white); }
.band--warm { background: var(--warm); --text-2: #586880; }  /* secondary text darkened to keep 4.5:1 on the warm background */
.band--off { background: var(--off-white); --text-2: #586880; }
.band--dark, .band--deep { color: var(--on-dark); }
.band--dark { background: var(--navy-900); }
.band--deep { background: var(--navy-800); }
.band--dark .lede, .band--deep .lede, .band--dark .muted, .band--deep .muted { color: var(--on-dark-2); }
.band--dark a:not(.btn), .band--deep a:not(.btn) { color: var(--emerald-500); }
.band--light + .band--light, .band--warm + .band--warm { padding-top: 0; }
.band--ruled { border-top: 1px solid var(--border); }

/* Engineering grid, used on dark bands only */
.band--grid::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 85%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 85%);
}
.band > .container { position: relative; }

/* --- Rail layout: heading in a left rail, content to the right ---------- */
.rail { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--s-7) clamp(2rem, 5vw, 5rem); align-items: start; }
.rail__head { position: sticky; top: calc(var(--header-h) + 32px); }
.rail__head h2 + .lede { margin-top: var(--s-4); }
.rail__head .lede { font-size: 1.0625rem; }
.rail__head .btn-row { margin-top: var(--s-5); }

.stack-head { max-width: 46rem; margin-bottom: var(--s-7); }
.stack-head h2 + .lede { margin-top: var(--s-4); }

.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.split--flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split--flip > :first-child { order: 2; }
.split__text h2 + .lede { margin-top: var(--s-4); }
.split__text .lede + * { margin-top: var(--s-5); }

.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2em; font-size: 1.625rem; letter-spacing: -0.02em; }
.prose h3 { margin-top: 1.8em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li + li { margin-top: 0.4em; }
.prose { max-width: 44rem; }

/* --- Header ------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  background: rgba(7, 24, 39, 0.92);
  -webkit-backdrop-filter: saturate(140%) blur(14px); backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line-dark); color: var(--on-dark);
  transition: background-color 0.25s var(--ease);
}
.site-header.is-scrolled { background: rgba(7, 24, 39, 0.98); }
.site-header > .container { max-width: 1400px; }
.site-header__inner { height: 100%; display: flex; align-items: center; gap: var(--s-5); }

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--on-dark); text-decoration: none; flex: none; }
.brand:hover { color: var(--on-dark); }
.brand__mark { width: 30px; height: 30px; }
.brand__name { font-size: 1.0625rem; font-weight: 700; letter-spacing: -0.02em; white-space: nowrap; }
.brand__name span { font-weight: 400; color: var(--on-dark-2); }

.nav { margin-left: auto; }
.nav__list { display: flex; align-items: center; gap: 2px; }
.nav__item { position: relative; }
.nav__link {
  display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 9px;
  font-size: 0.84375rem; font-weight: 500; color: var(--on-dark-2); text-decoration: none;
  background: none; border: 0; border-radius: var(--r-control); cursor: pointer; white-space: nowrap;
  transition: color 0.15s, background-color 0.15s;
}
.nav__link:hover, .nav__link[aria-expanded="true"] { color: var(--on-dark); background: rgba(255,255,255,0.06); }
.nav__link[aria-current="page"], .nav__link.is-section { color: var(--on-dark); }
.nav__link[aria-current="page"]::after, .nav__link.is-section::after {
  content: ""; position: absolute; left: 9px; right: 9px; bottom: -16px; height: 2px; background: var(--emerald-500);
}
.nav__caret { width: 10px; height: 10px; transition: transform 0.2s var(--ease); }
.nav__link[aria-expanded="true"] .nav__caret { transform: rotate(180deg); }

.menu {
  position: absolute; top: calc(100% + 16px); left: 0; min-width: 300px; padding: var(--s-3);
  background: var(--white); color: var(--text); border-radius: var(--r-panel); box-shadow: var(--shadow-menu);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
}
.menu.is-open { opacity: 1; visibility: visible; transform: none; }
.menu--mega { width: min(760px, calc(100vw - 48px)); left: -160px; padding: 0; display: grid; grid-template-columns: 1fr 240px; overflow: hidden; }
.menu__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; padding: var(--s-3); }
.menu__link { display: block; padding: 12px 14px; border-radius: var(--r-control); text-decoration: none; color: var(--text); }
.menu__link:hover { background: var(--warm); color: var(--text); }
.menu__link strong { display: block; font-size: 0.9375rem; font-weight: 600; letter-spacing: -0.01em; }
.menu__link span { display: block; margin-top: 2px; font-size: 0.8125rem; line-height: 1.45; color: var(--text-2); }
.menu__aside { background: var(--navy-900); color: var(--on-dark); padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-3); }
.menu__aside p { font-size: 0.875rem; line-height: 1.5; color: var(--on-dark-2); }
.menu__aside a { margin-top: auto; color: var(--emerald-500); font-size: 0.875rem; font-weight: 600; }

.header-cta { display: flex; align-items: center; gap: var(--s-2); flex: none; }
.nav-toggle { display: none; }

/* --- Page hero (interior pages) ----------------------------------------- */
.page-hero { background: var(--navy-900); color: var(--on-dark); padding-block: clamp(3.5rem, 2rem + 6vw, 7rem) clamp(3rem, 2rem + 4vw, 5.5rem); position: relative; overflow: hidden; }
.page-hero .lede { color: var(--on-dark-2); margin-top: var(--s-5); }
.page-hero h1 { max-width: 17em; }
.page-hero .btn-row { margin-top: var(--s-6); }
.page-hero--split .container { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.page-hero--split .container > * { position: relative; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--s-5); font-size: var(--fs-micro); color: var(--on-dark-3); }
.crumbs a { color: var(--on-dark-2); text-decoration: none; }
.crumbs a:hover { color: var(--on-dark); }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: var(--on-dark-3); }

/* --- Footer ------------------------------------------------------------- */
.site-footer { background: var(--navy-900); color: var(--on-dark-2); font-size: var(--fs-small); border-top: 1px solid var(--line-dark); }
.site-footer a { color: var(--on-dark-2); text-decoration: none; }
.site-footer a:hover { color: var(--on-dark); }
.footer__top { display: grid; grid-template-columns: minmax(0, 4fr) repeat(4, minmax(0, 2fr)); gap: var(--s-7) var(--s-6); padding-block: var(--s-8) var(--s-7); }
.footer__about p { margin-top: var(--s-4); max-width: 26em; line-height: 1.6; }
.footer__col h2 { font-size: 0.875rem; font-weight: 600; letter-spacing: 0; color: var(--on-dark); margin-bottom: var(--s-4); }
.footer__col li + li { margin-top: 10px; }
.footer__risk { border-top: 1px solid var(--line-dark); padding-block: var(--s-6); font-size: var(--fs-micro); line-height: 1.65; color: var(--on-dark-3); }
.footer__risk p + p { margin-top: var(--s-3); }
.footer__risk strong { color: var(--on-dark-2); }
.footer__bottom { border-top: 1px solid var(--line-dark); padding-block: var(--s-5); display: flex; flex-wrap: wrap; gap: var(--s-3) var(--s-6); justify-content: space-between; font-size: var(--fs-micro); color: var(--on-dark-3); }
.footer__legal { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-5); }

/* --- Launch-state switching (driven by config.js) ------------------------ */
[data-show="operational"] { display: none !important; }
html[data-launch-state="operational"] [data-show="operational"] { display: revert !important; }
html[data-launch-state="operational"] .tag[data-show="operational"] { display: inline-flex !important; }
html[data-launch-state="operational"] [data-show="pre-launch"] { display: none !important; }

/* Sub-sections separated by a rule use tighter vertical rhythm */
.band.band--ruled { padding-block: clamp(3rem, 2rem + 4vw, 5.5rem); }
.band.band--ruled > .container { padding-top: clamp(3rem, 2rem + 4vw, 5.5rem); }
.band.band--ruled > .container::before { content: ""; position: absolute; top: 0; left: var(--gutter); right: var(--gutter); border-top: 1px solid var(--border); }
.band.band--ruled { padding-top: 0; border-top: 0; }
.band.band--flush { padding-top: 0; }
.band--flush .pblock:first-child, .band--flush .sol:first-child { border-top: 0; }
.band.band--tight { padding-top: 0; }

/* Global technology network, used once behind the homepage closing band */
.band--cta { overflow: hidden; }
.band__art { position: absolute; inset: 0; pointer-events: none; opacity: 0.55;
  -webkit-mask-image: linear-gradient(to right, transparent 25%, #000 100%); mask-image: linear-gradient(to right, transparent 25%, #000 100%); }
.band__art svg { width: 100%; height: 100%; }