/* =========================================================
   Cyber-Resilient Autonomous Micro Data Centers
   Design language: engineering schematic — a systems diagram
   that happens to be a webpage. Deep graphite-blue base,
   amber for physical/energy concerns, teal for trust/evidence.
   ========================================================= */

:root {
  --bg: #0a0f1a;
  --bg-alt: #0d1424;
  --panel: #101a2c;
  --panel-2: #142036;
  --line: #22314a;
  --line-soft: #1a2438;
  --text: #e8edf5;
  --text-dim: #97a4b8;
  --text-faint: #62708a;
  --teal: #5fb3a8;
  --teal-dim: rgba(95, 179, 168, 0.14);
  --amber: #cf9a56;
  --amber-dim: rgba(207, 154, 86, 0.14);

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;

  --radius: 4px;
  --radius-lg: 8px;
  --container-w: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- background grid ---------- */

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 85%);
          mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 85%);
  opacity: 0.55;
}

/* ---------- nav ---------- */

.nav-wrap {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 15, 26, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--teal);
  background: var(--teal-dim);
  border: 1px solid rgba(95, 179, 168, 0.3);
  border-radius: var(--radius);
  padding: 4px 8px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.1rem;
  width: 40px;
  height: 40px;
  cursor: pointer;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-cta {
  color: var(--teal) !important;
  border: 1px solid rgba(95, 179, 168, 0.35);
  border-radius: var(--radius);
  padding: 7px 14px;
}

.nav-cta:hover {
  background: var(--teal-dim);
}

/* ---------- reveal-on-scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible,
.reveal.in-view,
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  cursor: pointer;
}

.btn.primary {
  background: var(--teal);
  color: #07130f;
}

.btn.primary:hover {
  background: #74c2b8;
}

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

.btn.secondary:hover {
  border-color: var(--teal);
  color: var(--teal);
}

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
  padding: 88px 24px 96px;
}

.eyebrow {
  font-size: 0.8rem;
  color: var(--amber);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-bottom: 18px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.3rem, 4.4vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--text);
}

.hero h1 span {
  color: var(--teal);
}

.lede {
  color: var(--text-dim);
  font-size: 1.06rem;
  line-height: 1.65;
  max-width: 48ch;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-tags span {
  font-size: 0.76rem;
  color: var(--text-faint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 5px 10px;
}

.hero-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.status {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.85rem;
  color: var(--teal);
  font-weight: 500;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(95, 179, 168, 0.55);
  animation: pulse 2.2s ease-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(95, 179, 168, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(95, 179, 168, 0); }
  100% { box-shadow: 0 0 0 0 rgba(95, 179, 168, 0); }
}

.metric {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.hero-panel .metric:first-of-type {
  border-top: none;
  padding-top: 0;
}

.metric strong {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

.metric span {
  color: var(--text-dim);
  font-size: 0.84rem;
  text-align: right;
  max-width: 60%;
}

.panel-note {
  font-size: 0.82rem;
  color: var(--text-faint);
  line-height: 1.55;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ---------- sections ---------- */

.section {
  padding: 100px 0;
}

.section.alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.section-head {
  max-width: 620px;
  margin: 0 0 52px;
}

.kicker {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--amber);
  margin-bottom: 12px;
}

.section-head h2,
.hero h1 + h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 2.8vw, 2.25rem);
  line-height: 1.25;
  color: var(--text);
  margin: 0 0 14px;
}

.section-head p {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 58ch;
  line-height: 1.6;
  margin: 0;
}

/* ---------- card grids ---------- */

.cards {
  display: grid;
  gap: 20px;
}

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

.cards.four {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.card .icon {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.card .num {
  display: block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--amber);
  margin-bottom: 12px;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px;
}

.card p {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
}

/* ---------- research question ---------- */

.question {
  margin-top: 48px;
  background: var(--panel-2);
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 34px 36px;
}

.question span {
  display: block;
  font-size: 0.8rem;
  color: var(--text-faint);
  margin-bottom: 12px;
}

.question blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  line-height: 1.5;
  color: var(--text);
}

/* ---------- architecture diagram ---------- */

.architecture {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-areas:
    ".   n1    n2"
    "n6  core  n3"
    "n5  n4    .";
  gap: 16px;
  max-width: 700px;
  margin: 0 auto 56px;
}

.arch-node {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.arch-node strong {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.arch-node span {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.n1 { grid-area: n1; }
.n2 { grid-area: n2; }
.n3 { grid-area: n3; }
.n4 { grid-area: n4; }
.n5 { grid-area: n5; }
.n6 { grid-area: n6; }

.arch-core {
  grid-area: core;
  position: relative;
  min-height: 148px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.core-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 1px solid rgba(95, 179, 168, 0.35);
  transform: translate(-50%, -50%);
}

.core-ring.ring-1 {
  width: 96px;
  height: 96px;
  animation: spin 16s linear infinite;
}

.core-ring.ring-2 {
  width: 140px;
  height: 140px;
  border-style: dashed;
  border-color: rgba(207, 154, 86, 0.3);
  animation: spin-reverse 24s linear infinite;
}

@keyframes spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to   { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes spin-reverse {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to   { transform: translate(-50%, -50%) rotate(-360deg); }
}

.core-label {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 108px;
  height: 108px;
  justify-content: center;
  padding: 8px;
}

.core-label small {
  font-size: 0.62rem;
  color: var(--text-faint);
  letter-spacing: 0.02em;
}

.core-label strong {
  font-family: var(--font-display);
  font-size: 0.86rem;
  color: var(--text);
  margin: 2px 0;
}

.core-label span {
  font-size: 0.65rem;
  color: var(--text-dim);
  line-height: 1.3;
}

/* ---------- threat table ---------- */

.threat-table {
  overflow-x: auto;
  border-top: 1px solid var(--line);
}

.trow {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1.6fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  min-width: 620px;
}

.trow.thead {
  padding-top: 0;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-faint);
}

.trow span:first-child {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--text);
  font-size: 0.95rem;
}

.trow:not(.thead) span:not(:first-child) {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.55;
}

/* ---------- validation timeline ---------- */

.timeline {
  display: flex;
  gap: 28px;
  margin-bottom: 56px;
  position: relative;
}

.step {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.step-no {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--teal);
  color: var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  flex-shrink: 0;
}

.step h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 6px;
}

.step p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 0;
}

/* ---------- labs ---------- */

.lab-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.lab {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.lab span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--amber-dim);
  color: var(--amber);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.lab h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px;
}

.lab p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* ---------- artifact list ---------- */

.artifact-list {
  border-top: 1px solid var(--line);
}

.artifact {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.artifact > div {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-faint);
}

.artifact h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 5px;
}

.artifact p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 0;
}

.artifact > span {
  justify-self: end;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--teal);
  border: 1px solid rgba(95, 179, 168, 0.3);
  border-radius: var(--radius);
  padding: 6px 11px;
  white-space: nowrap;
}

/* ---------- outcomes ---------- */

.outcomes .split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.outcomes .section-head {
  margin-bottom: 0;
}

.outcome-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 24px;
}

.outcome-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.outcome-grid p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
  margin: 0;
}

/* ---------- contact cta ---------- */

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.cta h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  color: var(--text);
  margin: 0 0 12px;
}

.cta p {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 46ch;
  margin: 0;
}

.cta .btn.primary {
  flex-shrink: 0;
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 52px 0 44px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 36px;
}

.footer-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.98rem;
  color: var(--text);
  margin-bottom: 8px;
}

.footer-grid span {
  display: block;
  font-size: 0.76rem;
  color: var(--text-faint);
  margin-bottom: 8px;
}

.footer-grid p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 0;
}

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

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 44px;
    padding: 56px 24px 64px;
  }

  .cards.three,
  .cards.four {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .outcomes .split {
    grid-template-columns: 1fr;
  }

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

  .timeline {
    flex-direction: column;
    gap: 32px;
  }

  .cta {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 12px 24px 20px;
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 10px 0;
  }

  .section {
    padding: 64px 0;
  }

  .cards.three,
  .cards.four {
    grid-template-columns: 1fr;
  }

  .architecture {
    grid-template-columns: 1fr;
    grid-template-areas:
      "core"
      "n1"
      "n2"
      "n3"
      "n4"
      "n5"
      "n6";
    max-width: 360px;
  }

  .arch-core {
    min-height: 160px;
  }

  .artifact {
    grid-template-columns: 40px 1fr;
    row-gap: 8px;
  }

  .artifact > span {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .cta {
    padding: 32px;
  }
}