/* SATARK website — technical, high-contrast, responsive */

:root {
  --bg: #0c0c0e;
  --bg-elevated: #161618;
  --bg-soft: #1d1d21;
  --border: #2e2e34;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --accent: #ed1c24;
  --accent-strong: #c81018;
  --accent-dim: rgba(237, 28, 36, 0.14);
  --warning: #e0b35a;
  --focus: #ff6b72;
  --max: 68rem;
  --font-display: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;
  --radius: 0.35rem;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(1100px 560px at 8% -12%, rgba(237, 28, 36, 0.18), transparent 55%),
    radial-gradient(800px 420px at 92% 0%, rgba(237, 28, 36, 0.06), transparent 50%),
    linear-gradient(180deg, #0c0c0e 0%, #121214 45%, #0c0c0e 100%);
  background-attachment: fixed;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #ff4d54;
}

a:focus-visible,
button:focus-visible,
.nav-toggle:focus-visible,
.site-nav a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -3rem;
  z-index: 1000;
  padding: var(--space-2) var(--space-3);
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-3);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 20, 0.82);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0.9rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand:hover {
  color: var(--text);
}

.brand__logo {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  border-radius: 0.2rem;
  background: #ffffff;
  flex-shrink: 0;
}

.brand__mark {
  color: var(--text);
  font-size: 1.2rem;
}

.brand__tag {
  display: none;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.site-nav {
  display: none;
}

.site-nav.is-open {
  display: block;
  position: absolute;
  inset-inline: 0;
  top: 100%;
  padding: var(--space-3);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.site-nav a {
  display: block;
  padding: 0.7rem 0.85rem;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--accent-dim);
  color: var(--accent);
}

.hero {
  position: relative;
  padding: clamp(3.5rem, 10vw, 7rem) 0 clamp(3rem, 7vw, 5rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(42, 53, 68, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 53, 68, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 85%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: 48rem;
  animation: rise-in 520ms ease-out both;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__identity {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 var(--space-3);
}

.hero__logo {
  width: clamp(4.5rem, 12vw, 6.5rem);
  height: clamp(4.5rem, 12vw, 6.5rem);
  object-fit: contain;
  border-radius: 0.45rem;
  background: #ffffff;
  box-shadow: 0 10px 40px rgba(237, 28, 36, 0.22);
}

.hero__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 5.5rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 0.95;
  color: var(--text);
}

.hero__expansion {
  margin: 0 0 var(--space-4);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  font-weight: 500;
  line-height: 1.35;
  max-width: 36rem;
}

.hero__lede {
  margin: 0 0 var(--space-5);
  color: var(--text-muted);
  font-size: 1.12rem;
  max-width: 40rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.85rem;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--accent);
  color: #ffffff;
}

.button--primary:hover {
  background: #ff333b;
  color: #ffffff;
}

.button--secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.button--secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  padding: var(--space-6) 0;
}

.section--tight {
  padding: var(--space-5) 0;
}

.section__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  letter-spacing: 0.02em;
}

.section__lede {
  margin: 0 0 var(--space-4);
  color: var(--text-muted);
  max-width: 42rem;
}

.evolution {
  display: grid;
  gap: var(--space-3);
}

.evolution__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-4);
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 0.15rem);
}

.evolution__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
}

.evolution__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.evolution__body {
  margin: 0;
  color: var(--text-muted);
}

.split {
  display: grid;
  gap: var(--space-4);
}

.panel {
  padding: var(--space-4);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 0.15rem);
}

.panel h3 {
  margin-top: 0;
  font-family: var(--font-display);
}

.panel p:last-child {
  margin-bottom: 0;
}

.list-plain {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-muted);
}

.list-plain li + li {
  margin-top: 0.45rem;
}

.pub-group__title {
  margin: var(--space-5) 0 var(--space-3);
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.pub-list {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  border-top: 1px solid var(--border);
}

.pub {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}

.pub__title {
  margin: 0 0 0.35rem;
  font-weight: 600;
  color: var(--text);
}

.pub__meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--border);
}

.timeline__item {
  position: relative;
  padding: 0 0 var(--space-4) var(--space-4);
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -0.45rem;
  top: 0.35rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(61, 214, 198, 0.15);
}

.timeline__meta {
  display: inline-block;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.timeline__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.timeline__body {
  margin: 0;
  color: var(--text-muted);
}

.timeline__body + .timeline__body {
  margin-top: 0.75rem;
}

.timeline__quote {
  margin: 0.85rem 0 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(237, 28, 36, 0.08);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.5;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.timeline__media {
  margin: 1rem 0 0;
}

.timeline__img {
  display: block;
  width: 100%;
  max-width: 52rem;
  height: auto;
  border: 1px solid rgba(237, 28, 36, 0.45);
  border-radius: calc(var(--radius) + 0.1rem);
  background: var(--bg-elevated);
  box-shadow:
    0 0 0 1px rgba(237, 28, 36, 0.1) inset,
    0 0 18px rgba(237, 28, 36, 0.22);
}

.timeline__media-caption {
  margin: 0.65rem 0 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 42rem;
}

.badge {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: rgba(224, 179, 90, 0.15);
  color: var(--warning);
  font-size: 0.75rem;
  font-weight: 600;
  vertical-align: middle;
}

.page-hero {
  padding: clamp(2.5rem, 6vw, 4rem) 0 var(--space-4);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
}

.page-hero p {
  margin: 0;
  color: var(--text-muted);
  max-width: 42rem;
}

.site-footer {
  margin-top: var(--space-6);
  padding: var(--space-5) 0;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-4);
}

.site-footer h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li + li {
  margin-top: 0.4rem;
}

.site-footer a {
  color: var(--text);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}

.section__title--sm {
  font-size: 1.5rem;
}

.site-footer__note--flush {
  margin-top: 0;
}

.notice {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-left: 3px solid var(--warning);
  background: rgba(224, 179, 90, 0.08);
  border-radius: var(--radius);
  color: var(--text-muted);
}

.notice strong {
  color: var(--warning);
}

.code-block {
  overflow-x: auto;
  padding: var(--space-3);
  background: #070a0e;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #d7e6f5;
}

/* Mermaid architecture diagrams — neon outlines on dark ground */
.diagram-frame {
  position: relative;
  margin: var(--space-4) 0 0;
  padding: var(--space-4);
  overflow: hidden;
  background:
    radial-gradient(720px 280px at 20% 0%, rgba(237, 28, 36, 0.16), transparent 60%),
    radial-gradient(520px 240px at 90% 100%, rgba(224, 179, 90, 0.08), transparent 55%),
    linear-gradient(180deg, #101012 0%, #0c0c0e 100%);
  border: 1px solid rgba(237, 28, 36, 0.45);
  border-radius: calc(var(--radius) + 0.2rem);
  box-shadow:
    0 0 0 1px rgba(237, 28, 36, 0.12) inset,
    0 0 28px rgba(237, 28, 36, 0.18),
    var(--shadow);
}

.diagram-frame__glow {
  pointer-events: none;
  position: absolute;
  inset: -20% -10% auto;
  height: 55%;
  background: radial-gradient(ellipse at 50% 0%, rgba(255, 77, 84, 0.18), transparent 70%);
  animation: diagram-pulse 5.5s ease-in-out infinite;
}

.diagram-frame__caption {
  margin: var(--space-3) 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 48rem;
}

.diagram {
  margin: 0;
  overflow-x: auto;
  text-align: center;
}

.diagram svg {
  max-width: 100%;
  height: auto;
}

.diagram .node rect,
.diagram .node polygon,
.diagram .node circle,
.diagram .node path,
.diagram .cluster rect {
  filter:
    drop-shadow(0 0 3px rgba(237, 28, 36, 0.95))
    drop-shadow(0 0 10px rgba(237, 28, 36, 0.45));
}

.diagram .edgePath .path,
.diagram .flowchart-link {
  stroke: #ff4d54 !important;
  stroke-width: 2px !important;
  filter: drop-shadow(0 0 4px rgba(255, 77, 84, 0.85));
}

.diagram .marker {
  fill: #ff4d54 !important;
  stroke: #ff4d54 !important;
  filter: drop-shadow(0 0 3px rgba(255, 77, 84, 0.9));
}

.diagram .edgeLabel rect {
  fill: #0c0c0e !important;
  opacity: 0.92;
}

.diagram .cluster-label,
.diagram .nodeLabel,
.diagram .edgeLabel {
  color: var(--text);
}

@keyframes diagram-pulse {
  0%,
  100% {
    opacity: 0.55;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(4%);
  }
}

.section__title--follow {
  margin-top: var(--space-5);
}

.section__lede--follow {
  margin-top: var(--space-4);
}

.section__lede code,
.shot__caption code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: #ffc9cc;
}

.shot-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.shot {
  margin: 0;
}

.shot__img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(237, 28, 36, 0.55);
  border-radius: calc(var(--radius) + 0.1rem);
  background: #121214;
  box-shadow:
    0 0 0 1px rgba(237, 28, 36, 0.12) inset,
    0 0 22px rgba(237, 28, 36, 0.28),
    0 0 2px rgba(255, 77, 84, 0.9);
}

.shot__caption {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (min-width: 820px) {
  .brand__tag {
    display: inline;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
    position: static;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }

  .site-nav ul {
    flex-direction: row;
    align-items: center;
    gap: 0.15rem;
  }

  .site-nav a {
    padding: 0.45rem 0.7rem;
    font-size: 0.95rem;
  }

  .evolution {
    grid-template-columns: repeat(3, 1fr);
  }

  .split {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .shot-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__inner,
  .button,
  .button:hover,
  .diagram-frame__glow {
    transition: none;
    transform: none;
    animation: none;
  }
}