/* ==========================================================================
   DarkSky — Design Tokens
   ========================================================================== */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 1rem + 6vw, 6.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 1000px;
  --content-wide: 1280px;
  --content-full: 100%;

  --font-display: 'Cabinet Grotesk', 'General Sans', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* ---- DarkSky brand palette — dark only ---- */
:root {
  --color-bg: #090c11;
  --color-surface: #0f141c;
  --color-surface-2: #131923;
  --color-surface-offset: #18202b;
  --color-surface-dynamic: #1e2734;
  --color-divider: #1b222d;
  --color-border: #262f3d;

  --color-text: #edf1f7;
  --color-text-muted: #97a1b3;
  --color-text-faint: #5a6577;
  --color-text-inverse: #0a0d12;

  --color-primary: #5fa2ee;
  --color-primary-hover: #85b8f2;
  --color-primary-active: #4b8ad6;
  --color-primary-highlight: #17263a;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 8px 24px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 24px 64px oklch(0 0 0 / 0.55);
}

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-10));
}

.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}

.section-head {
  max-width: 46rem;
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-text);
  max-width: 34ch;
}

body {
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-text);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}
.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--ghost {
  background: color-mix(in oklab, var(--color-text) 6%, transparent);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  background: color-mix(in oklab, var(--color-text) 10%, transparent);
  border-color: var(--color-text-faint);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition:
    transform 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out);
}
.header--hidden {
  transform: translateY(-100%);
}
.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.brand__mark {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand__mark svg {
  width: 100%;
  height: 100%;
}

.brand__word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.nav__list {
  display: flex;
  gap: var(--space-8);
}

.nav__list a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}
.nav__list a:hover {
  color: var(--color-text);
}

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

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}
.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}
.menu-toggle[aria-expanded='true'] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded='true'] span:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded='true'] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  max-height: 0;
  overflow: hidden;
  border-top: 1px solid transparent;
  transition: max-height 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}
.mobile-nav.is-open {
  max-height: 320px;
  border-top-color: var(--color-divider);
}
.mobile-nav ul {
  padding: var(--space-4) clamp(var(--space-5), 4vw, var(--space-10)) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.mobile-nav a {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-divider);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: var(--space-3);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  z-index: 200;
}
.skip-link:focus {
  left: var(--space-3);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #05070a;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 65%;
}
.hero__scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, oklch(0.05 0.02 250 / 0.35) 0%, oklch(0.05 0.02 250 / 0.55) 45%, oklch(0.03 0.02 250 / 0.92) 100%),
    linear-gradient(90deg, oklch(0.03 0.02 250 / 0.55) 0%, oklch(0.03 0.02 250 / 0.05) 55%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(var(--space-24), 14vw, var(--space-32));
  max-width: 46rem;
}

.hero .eyebrow {
  color: #9dc4f2;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-hero);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: #f7f9fc;
  margin-bottom: var(--space-6);
}

.hero__lede {
  font-size: var(--text-lg);
  color: #c7d1e0;
  max-width: 38ch;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero .btn--ghost {
  background: color-mix(in oklab, white 10%, transparent);
  color: #f7f9fc;
  border-color: color-mix(in oklab, white 25%, transparent);
}
.hero .btn--ghost:hover {
  background: color-mix(in oklab, white 16%, transparent);
}

/* ==========================================================================
   Mission
   ========================================================================== */

.mission__grid {
  display: grid;
  grid-template-columns: minmax(0, 38rem) 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-16));
  align-items: center;
}

.mission__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.mission .section-title {
  font-size: var(--text-2xl);
  max-width: 22ch;
  font-weight: 700;
}

.mission__text p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 60ch;
}

.mission__media {
  display: flex;
  justify-content: center;
  align-items: center;
}
.mission__media img {
  width: 120%;
  max-width: 120%;
  height: auto;
  object-fit: contain;
  mix-blend-mode: normal;
  filter: brightness(1.05);
}

/* ==========================================================================
   Capabilities
   ========================================================================== */

.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.cap-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.cap-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.cap-card__icon {
  width: 44px;
  height: 44px;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.cap-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.cap-card p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ==========================================================================
   Divider image
   ========================================================================== */

.divider-image {
  width: 100%;
  line-height: 0;
}
.divider-image img {
  width: 100%;
  height: clamp(260px, 42vw, 560px);
  object-fit: cover;
}

/* ==========================================================================
   Approach
   ========================================================================== */

.approach-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.approach-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}

.approach-item__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.approach-item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}

.approach-item p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ==========================================================================
   Network / partners
   ========================================================================== */

.network__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-20));
  align-items: center;
}

.network__image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.network__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.network .section-title {
  font-size: var(--text-xl);
}

.network__content p {
  color: var(--color-text-muted);
  margin-block: var(--space-5) var(--space-6);
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.check-list li {
  position: relative;
  padding-left: var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.check-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  border: 1px solid var(--color-primary);
}
.check-list li::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 0.6em;
  width: 6px;
  height: 3px;
  border-left: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(-45deg);
}

/* ==========================================================================
   CTA
   ========================================================================== */

.cta {
  background: linear-gradient(180deg, var(--color-surface-2), var(--color-bg));
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.cta__inner {
  max-width: 42rem;
  text-align: left;
}

.cta__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
  max-width: 20ch;
}

.cta__lede {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-8);
  max-width: 56ch;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  padding-block: var(--space-12);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.footer__nav {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.footer__nav a:hover {
  color: var(--color-text);
}

.footer__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  width: 100%;
  order: 3;
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-6);
  margin-top: var(--space-2);
}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */

.reveal {
  opacity: 0;
  clip-path: inset(0 0 12% 0);
  transition: opacity 0.7s var(--ease-out), clip-path 0.7s var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  clip-path: inset(0 0 0% 0);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 900px) {
  .nav {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .mobile-nav {
    display: block;
  }

  .mission__grid {
    grid-template-columns: 1fr;
  }
  .cap-grid {
    grid-template-columns: 1fr;
  }
  .approach-list {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .network__grid {
    grid-template-columns: 1fr;
  }
  .network__image {
    order: -1;
  }
}

@media (max-width: 560px) {
  .hero {
    min-height: 92vh;
  }
  .hero__media img {
    object-position: center 70%;
  }
  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}