/* ==========================================================================
   HSAT Website — Site-wide stylesheet
   Built on the HSAT Design System tokens (see tokens.css).
   ========================================================================== */

@import url('./tokens.css');

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg-1); color: var(--fg-1); }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
a { color: inherit; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--sp-5);
}
@media (min-width: 768px) {
  .container { padding-inline: var(--sp-6); }
}
@media (min-width: 1024px) {
  .container { padding-inline: var(--sp-7); }
}

.container-narrow {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

/* ---------- Skip link (a11y) ---------- */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--sp-4);
  background: var(--hsat-black);
  color: var(--hsat-white);
  padding: var(--sp-3) var(--sp-4);
  text-decoration: none;
  z-index: 1000;
  border-radius: 0;
}
.skip-link:focus { top: var(--sp-4); }

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-1);
  border-bottom: 1px solid var(--border-1);
}
.site-header.dark {
  background: var(--hsat-black);
  color: var(--hsat-white);
  border-bottom-color: var(--hsat-grey-900);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--sp-6);
}
.site-header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.site-header__logo img { height: 28px; width: auto; }

/* Primary nav */
.primary-nav {
  display: none;
  gap: var(--sp-6);
  align-items: center;
}
@media (min-width: 1024px) {
  .primary-nav { display: flex; }
}

.primary-nav__item {
  position: relative;
}
.primary-nav__link {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: inherit;
  text-decoration: none;
  padding: var(--sp-2) 0;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  transition: color var(--dur-fast) var(--ease-standard);
  background: none;
  border: 0;
  cursor: pointer;
}
.primary-nav__link:hover,
.primary-nav__link[aria-expanded="true"] {
  color: var(--hsat-green);
}
.primary-nav__chev {
  width: 12px;
  height: 12px;
  transition: transform var(--dur-fast) var(--ease-standard);
}
.primary-nav__link[aria-expanded="true"] .primary-nav__chev {
  transform: rotate(180deg);
}

/* Mega menu */
.mega-menu {
  position: absolute;
  top: calc(100% + 1px);
  left: 0;
  min-width: 320px;
  background: var(--hsat-white);
  border: 1px solid var(--border-1);
  color: var(--fg-1);
  box-shadow: var(--shadow-2);
  padding: var(--sp-5);
  display: none;
  z-index: 200;
}
.mega-menu[data-open="true"] { display: block; }

.mega-menu--wide {
  min-width: 560px;
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5) var(--sp-6);
}
.mega-menu--wide[data-open="true"] { display: grid; }

.mega-menu__group { }
.mega-menu__heading {
  font-size: var(--fs-micro);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-3);
  margin-bottom: var(--sp-3);
}
.mega-menu__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--sp-1); }
.mega-menu__link {
  display: block;
  padding: var(--sp-2) 0;
  text-decoration: none;
  color: var(--fg-1);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  transition: color var(--dur-fast) var(--ease-standard);
}
.mega-menu__link:hover { color: var(--hsat-green); }
.mega-menu__link--featured {
  font-size: var(--fs-body);
  font-weight: var(--fw-demi);
}
.mega-menu__desc {
  display: block;
  font-size: var(--fs-body-sm);
  color: var(--fg-2);
  font-weight: var(--fw-regular);
  margin-top: 4px;
  line-height: 1.4;
}

/* Mobile nav */
.mobile-toggle {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-1);
  color: inherit;
}
.site-header.dark .mobile-toggle { border-color: var(--hsat-grey-900); }
@media (min-width: 1024px) { .mobile-toggle { display: none; } }

.mobile-nav {
  display: none;
  padding: var(--sp-5) 0 var(--sp-6);
  border-top: 1px solid var(--border-1);
}
.site-header[data-mobile-open="true"] .mobile-nav { display: block; }
.site-header.dark[data-mobile-open="true"] .mobile-nav { border-top-color: var(--hsat-grey-900); }

.mobile-nav__group + .mobile-nav__group {
  margin-top: var(--sp-5);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border-1);
}
.site-header.dark .mobile-nav__group + .mobile-nav__group { border-top-color: var(--hsat-grey-900); }
.mobile-nav__heading {
  font-size: var(--fs-micro);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-3);
  margin-bottom: var(--sp-3);
}
.mobile-nav__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--sp-3); }
.mobile-nav__link {
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  color: inherit;
  text-decoration: none;
}
.mobile-nav__link:hover { color: var(--hsat-green); }

.site-header__cta {
  display: none;
}
@media (min-width: 1024px) {
  .site-header__cta { display: inline-flex; }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-family: var(--font-sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-demi);
  line-height: 1;
  padding: 14px 22px;
  border-radius: var(--radius-0);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-standard),
              color var(--dur-fast) var(--ease-standard),
              border-color var(--dur-fast) var(--ease-standard),
              transform var(--dur-fast) var(--ease-standard);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

.btn--primary {
  background: var(--hsat-black);
  color: var(--hsat-white);
  border-color: var(--hsat-black);
}
.btn--primary:hover {
  background: var(--hsat-grey-900);
  border-color: var(--hsat-grey-900);
  color: var(--hsat-white);
}

.btn--accent {
  background: var(--hsat-green);
  color: var(--hsat-black);
  border-color: var(--hsat-green);
}
.btn--accent:hover {
  background: #82ac16;
  border-color: #82ac16;
  color: var(--hsat-black);
}

.btn--outline {
  background: transparent;
  color: currentColor;
  border-color: currentColor;
}
.btn--outline:hover {
  background: var(--hsat-green);
  color: var(--hsat-black);
  border-color: var(--hsat-green);
}

.btn--ghost {
  background: transparent;
  color: currentColor;
  border-color: transparent;
  padding-inline: var(--sp-2);
}
.btn--ghost:hover { color: var(--hsat-green); }

.btn--sm { padding: 10px 16px; font-size: var(--fs-caption); }
.btn--lg { padding: 18px 28px; font-size: var(--fs-body); }

.btn__arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--dur-fast) var(--ease-standard);
}
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: var(--hsat-black);
  color: var(--hsat-white);
  padding-block: var(--sp-9) var(--sp-5);
  margin-top: var(--sp-10);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-7);
}
@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}
.site-footer__brand { max-width: 360px; }
.site-footer__brand img { height: 28px; width: auto; margin-bottom: var(--sp-4); }
.site-footer__tagline {
  font-size: var(--fs-body);
  color: var(--hsat-grey-400);
  line-height: var(--lh-body);
  margin-bottom: var(--sp-5);
}

.site-footer__col-heading {
  font-size: var(--fs-micro);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--hsat-grey-400);
  margin-bottom: var(--sp-4);
}
.site-footer__list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--sp-3); }
.site-footer__list a {
  color: var(--hsat-white);
  text-decoration: none;
  font-size: var(--fs-body-sm);
  transition: color var(--dur-fast) var(--ease-standard);
}
.site-footer__list a:hover { color: var(--hsat-green); }

.site-footer__contact {
  margin-top: var(--sp-7);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--hsat-grey-900);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}
@media (min-width: 768px) {
  .site-footer__contact { grid-template-columns: 1fr auto; align-items: end; }
}
.site-footer__contact-links { display: flex; flex-direction: column; gap: var(--sp-2); font-size: var(--fs-body-sm); }
.site-footer__contact-links a { color: var(--hsat-white); text-decoration: none; }
.site-footer__contact-links a:hover { color: var(--hsat-green); }

.site-footer__bottom {
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--hsat-grey-900);
  font-size: var(--fs-caption);
  color: var(--hsat-grey-500);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}
@media (min-width: 768px) {
  .site-footer__bottom { grid-template-columns: 1fr auto; align-items: center; }
}
.site-footer__legal { display: flex; gap: var(--sp-5); flex-wrap: wrap; }
.site-footer__legal a { color: var(--hsat-grey-400); text-decoration: none; }
.site-footer__legal a:hover { color: var(--hsat-green); }

.site-footer__reg {
  grid-column: 1 / -1;
  color: var(--hsat-grey-600);
  line-height: 1.6;
}

/* ==========================================================================
   SECTIONS / TYPOGRAPHY HELPERS
   ========================================================================== */
.section {
  padding-block: var(--sp-9);
}
.section--sm { padding-block: var(--sp-8); }
.section--lg { padding-block: var(--sp-10); }
.section--paper { background: var(--bg-2); }
.section--dark { background: var(--hsat-black); color: var(--hsat-white); }
.section--dark .eyebrow { color: var(--hsat-grey-400); }

.eyebrow {
  font-size: var(--fs-micro);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-2);
  margin-bottom: var(--sp-4);
  display: block;
}

.display-1 {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: var(--fw-demi);
  line-height: var(--lh-tight);
  letter-spacing: -0.025em;
}
.display-2 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: var(--fw-demi);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
}
.h-xl { font-size: clamp(32px, 4.5vw, 48px); font-weight: var(--fw-demi); line-height: var(--lh-heading); letter-spacing: -0.015em; }
.h-lg { font-size: clamp(24px, 3vw, 36px); font-weight: var(--fw-demi); line-height: var(--lh-heading); letter-spacing: -0.01em; }
.h-md { font-size: clamp(20px, 2.2vw, 28px); font-weight: var(--fw-demi); line-height: var(--lh-heading); }

.lead { font-size: var(--fs-body-lg); line-height: var(--lh-body); color: var(--fg-2); max-width: 68ch; }
.muted { color: var(--fg-2); }

.accent { color: var(--hsat-green); }
.accent-underline {
  display: inline;
  background-image: linear-gradient(var(--hsat-green), var(--hsat-green));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 6px;
  padding-bottom: 2px;
}

/* ==========================================================================
   CARDS / GRIDS / COMMON BLOCKS
   ========================================================================== */
.card {
  background: var(--bg-1);
  border: 1px solid var(--border-1);
  padding: var(--sp-6);
  transition: border-color var(--dur-fast) var(--ease-standard),
              transform var(--dur-fast) var(--ease-standard);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  height: 100%;
}
a.card:hover { border-color: var(--hsat-black); }
.card--dark { background: var(--hsat-ink-1); border-color: var(--hsat-grey-900); color: var(--hsat-white); }
a.card--dark:hover { border-color: var(--hsat-green); }

.grid-2 { display: grid; gap: var(--sp-6); grid-template-columns: minmax(0, 1fr); }
.grid-3 { display: grid; gap: var(--sp-6); grid-template-columns: minmax(0, 1fr); }
.grid-4 { display: grid; gap: var(--sp-5); grid-template-columns: minmax(0, 1fr); }
.grid-2 > *, .grid-3 > *, .grid-4 > * { min-width: 0; }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Stat blocks */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.stat__value {
  font-size: clamp(40px, 5vw, 64px);
  font-weight: var(--fw-demi);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-size: var(--fs-caption);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-2);
}

/* Stats band — a horizontal row of pair (value / label) items, divided */
.stats-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
  padding-block: var(--sp-6);
  border-top: 1px solid var(--hsat-grey-900);
  border-bottom: 1px solid var(--hsat-grey-900);
}
@media (min-width: 720px) {
  .stats-band { grid-template-columns: repeat(3, 1fr); gap: 0; }
  .stats-band__item + .stats-band__item {
    border-left: 1px solid var(--hsat-grey-900);
    padding-left: var(--sp-6);
  }
}
.stats-band__item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.stats-band__value {
  font-size: clamp(36px, 4.2vw, 56px);
  line-height: 1;
  font-weight: var(--fw-demi);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stats-band__label {
  font-size: var(--fs-caption);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--hsat-grey-400);
  max-width: 30ch;
}
.section--dark .stats-band__value { color: var(--hsat-white); }

/* Bullet list used across the site */
.bulleted {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.bulleted li {
  position: relative;
  padding-left: 22px;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  min-width: 0;
}
.bulleted li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--hsat-green);
}
.bulleted li strong + * { margin-left: 4px; }
.bulleted li strong { font-weight: var(--fw-demi); }

/* Pull quote — brand uses quotes as a device */
.pullquote {
  border-top: 1px solid var(--hsat-black);
  border-bottom: 1px solid var(--hsat-black);
  padding-block: var(--sp-7);
  margin-block: var(--sp-7);
}
.pullquote__text {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: var(--fw-demi);
  line-height: var(--lh-heading);
  letter-spacing: -0.015em;
}
.pullquote__text::before { content: '\201C'; }
.pullquote__text::after { content: '\201D'; }
.pullquote__attr {
  margin-top: var(--sp-5);
  font-size: var(--fs-caption);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-2);
}

/* Breadcrumbs */
.breadcrumbs {
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  font-weight: var(--fw-demi);
  color: var(--fg-2);
  margin-bottom: var(--sp-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.breadcrumbs a { color: inherit; text-decoration: none; }
.breadcrumbs a:hover { color: var(--hsat-green); }
.breadcrumbs span[aria-hidden="true"] { color: var(--fg-3); }

/* ==========================================================================
   CASE STUDY IMAGES
   ========================================================================== */
.case-image {
  margin: 0;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--hsat-grey-100);
}
.case-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.case-image figcaption {
  padding: var(--sp-3) var(--sp-4);
  background: var(--bg-2);
  font-size: var(--fs-caption);
  font-weight: var(--fw-demi);
  color: var(--fg-2);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  border-top: 1px solid var(--border-1);
}

/* ==========================================================================
   IMAGE PLACEHOLDER (brand-consistent)
   ========================================================================== */
.img-placeholder {
  position: relative;
  background: var(--hsat-grey-100);
  overflow: hidden;
  aspect-ratio: 16/9;
  border: 1px solid var(--border-1);
}
.img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 48%, var(--hsat-grey-200) 48%, var(--hsat-grey-200) 52%, transparent 52%),
    linear-gradient(45deg, transparent 48%, var(--hsat-grey-200) 48%, var(--hsat-grey-200) 52%, transparent 52%);
}
.img-placeholder__label {
  position: absolute;
  bottom: var(--sp-4);
  left: var(--sp-4);
  font-size: var(--fs-caption);
  font-weight: var(--fw-demi);
  text-transform: uppercase;
  letter-spacing: var(--tracking-upper);
  color: var(--fg-2);
  background: var(--bg-1);
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--border-1);
}

/* ==========================================================================
   HERO VARIANTS (used across pages)
   ========================================================================== */
.hero {
  padding-block: var(--sp-9) var(--sp-8);
}
.hero--tall { padding-block: var(--sp-10) var(--sp-9); }
.hero__eyebrow { margin-bottom: var(--sp-5); }
.hero__title { margin-bottom: var(--sp-5); max-width: 18ch; }
.hero__lead { max-width: 60ch; margin-bottom: var(--sp-7); font-size: var(--fs-body-lg); color: var(--fg-2); line-height: var(--lh-body); }
.hero__ctas { display: flex; gap: var(--sp-4); flex-wrap: wrap; }

/* Full-bleed photo hero */
.hero-photo {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: end;
  color: var(--hsat-white);
  background: var(--hsat-black);
  overflow: hidden;
}
.hero-photo__bg { position: absolute; inset: 0; z-index: 0; }
.hero-photo__bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-photo__bg::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), rgba(0,0,0,0.2) 60%, rgba(0,0,0,0.2));
}
.hero-photo__content {
  position: relative;
  z-index: 1;
  padding-block: var(--sp-9);
  width: 100%;
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mt-7 { margin-top: var(--sp-7); }
.mt-8 { margin-top: var(--sp-8); }
.mb-5 { margin-bottom: var(--sp-5); }
.mb-7 { margin-bottom: var(--sp-7); }

/* Scroll reveal — progressive enhancement.
   Elements default to visible. If JS loads, it adds .js to <html> which hides
   [data-reveal] until JS adds .is-in (immediate snap — iframe renderers in the
   preview stall CSSTransition/animation at time 0, so we avoid both). */
html.js [data-reveal]:not(.is-in) {
  opacity: 0;
}
html.js [data-reveal].is-in {
  opacity: 1;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}