:root {
  --ink: #0e1412;
  --ink-soft: #1a2420;
  --fog: #c8d4cc;
  --paper: #e8f0ea;
  --phosphor: #3dff8a;
  --phosphor-dim: #1fa85a;
  --amber: #e8b84a;
  --line: rgba(232, 240, 234, 0.14);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
}

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

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--paper);
  background:
    radial-gradient(1100px 640px at 88% 8%, rgba(61, 255, 138, 0.14), transparent 55%),
    radial-gradient(900px 500px at -8% 35%, rgba(232, 184, 74, 0.08), transparent 50%),
    linear-gradient(165deg, #0a100e 0%, var(--ink) 45%, #121a16 100%);
}

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

a:hover {
  color: #9bffc0;
}

/* First viewport: brand + CTAs + live kit (no competing banner mockup). */
.hero {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.25rem 0 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
  gap: 1.75rem 2rem;
  align-items: start;
  animation: rise 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-copy {
  padding-top: 0.35rem;
}

.brand {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 6vw, 4rem);
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--phosphor);
  text-shadow: 0 0 40px rgba(61, 255, 138, 0.35);
  animation: phosphor 3.2s ease-in-out infinite;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--paper);
  max-width: 18ch;
}

.lede {
  margin: 0 0 1.35rem;
  max-width: 34rem;
  color: var(--fog);
  font-size: 1.02rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.6rem 1.15rem;
  border-radius: 0.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn.primary {
  background: var(--phosphor);
  color: var(--ink);
  box-shadow: 0 0 0 1px rgba(61, 255, 138, 0.4), 0 12px 30px rgba(61, 255, 138, 0.2);
}

.btn.primary:hover {
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(61, 255, 138, 0.55), 0 16px 36px rgba(61, 255, 138, 0.28);
}

.btn.ghost {
  background: rgba(14, 20, 18, 0.55);
  color: var(--paper);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.btn.ghost:hover {
  color: var(--paper);
  border-color: rgba(61, 255, 138, 0.45);
}

.hero-install {
  margin: 0;
  padding: 0.95rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: linear-gradient(145deg, rgba(26, 36, 32, 0.95), rgba(14, 20, 18, 0.9));
  overflow-x: auto;
}

.hero-install code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88rem;
  color: var(--phosphor);
  white-space: pre;
}

.hero-install .cmt {
  color: rgba(200, 212, 204, 0.55);
}

.hero-install .cmd {
  color: var(--phosphor);
}

.hero-demo {
  min-width: 0;
}

.demo-kicker {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--phosphor-dim);
}

.preview-controls {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.control-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.chip {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(26, 36, 32, 0.7);
  color: var(--paper);
  border-radius: 999px;
  min-height: 1.95rem;
  padding: 0.28rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.84rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.chip.lcd-chip[data-kit-lcd="green"] {
  border-color: rgba(157, 206, 70, 0.55);
}

.chip.lcd-chip[data-kit-lcd="blue"] {
  border-color: rgba(90, 170, 255, 0.55);
}

.chip.lcd-chip[data-kit-lcd="red"] {
  border-color: rgba(255, 110, 110, 0.55);
}

.chip.lcd-chip[data-kit-lcd="amber"] {
  border-color: rgba(232, 184, 74, 0.55);
}

.chip.lcd-chip.is-active[data-kit-lcd="green"] {
  background: rgba(157, 206, 70, 0.18);
  color: #c8f06a;
}

.chip.lcd-chip.is-active[data-kit-lcd="blue"] {
  background: rgba(90, 170, 255, 0.18);
  color: #9ecfff;
}

.chip.lcd-chip.is-active[data-kit-lcd="red"] {
  background: rgba(255, 110, 110, 0.18);
  color: #ffb0b0;
}

.chip.lcd-chip.is-active[data-kit-lcd="amber"] {
  background: rgba(232, 184, 74, 0.18);
  color: #f0d08a;
}

.chip:hover {
  border-color: rgba(61, 255, 138, 0.4);
}

.chip.is-active,
.chip[aria-pressed="true"] {
  background: rgba(61, 255, 138, 0.16);
  border-color: rgba(61, 255, 138, 0.55);
  color: var(--phosphor);
}

.chip.ghost {
  opacity: 0.85;
}

.kit-stage {
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background:
    radial-gradient(420px 180px at 50% 0%, rgba(61, 255, 138, 0.1), transparent 70%),
    linear-gradient(160deg, rgba(26, 36, 32, 0.92), rgba(14, 20, 18, 0.96));
  box-shadow: var(--shadow);
  padding: 0.55rem;
  overflow: hidden;
}

.kit-frame {
  display: block;
  width: 100%;
  min-height: 300px;
  height: 340px;
  border: 0;
  background: transparent;
}

.preview-note {
  margin: 0.65rem 0 0;
  color: var(--fog);
  font-size: 0.88rem;
}

.preview-note code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.86em;
  color: var(--phosphor-dim);
}

main {
  width: min(960px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 1.5rem 0 4rem;
}

.architecture {
  margin-bottom: 3rem;
}

.links h2,
.architecture h2 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.section-lede {
  margin: 0 0 1.25rem;
  color: var(--fog);
  max-width: 36rem;
}

.arch-flow {
  display: grid;
  grid-template-columns: minmax(140px, 0.9fr) auto minmax(160px, 1.05fr) auto minmax(180px, 1.2fr);
  gap: 0.65rem 0.55rem;
  align-items: center;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: linear-gradient(155deg, rgba(26, 36, 32, 0.95), rgba(14, 20, 18, 0.92));
  box-shadow: var(--shadow);
}

.arch-node {
  margin: 0;
  padding: 0.95rem 1rem;
  border-radius: 0.45rem;
  border: 1px solid var(--line);
  background: rgba(10, 16, 14, 0.72);
}

.arch-node h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.arch-node p {
  margin: 0.15rem 0 0;
  color: var(--fog);
  font-size: 0.9rem;
}

.arch-meta {
  color: var(--phosphor) !important;
  font-size: 0.82rem !important;
}

.arch-switch {
  border-color: rgba(61, 255, 138, 0.45);
}

.arch-server {
  border-color: rgba(232, 184, 74, 0.55);
}

.arch-consumers {
  display: grid;
  gap: 0.45rem;
}

.arch-consumers .arch-node {
  padding: 0.7rem 0.9rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--paper);
}

.arch-consumers code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-weight: 500;
  font-size: 0.82em;
  color: var(--phosphor);
}

.arch-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-width: 3.5rem;
  color: var(--phosphor);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.arch-arrow::before {
  content: "";
  width: 100%;
  max-width: 3rem;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--phosphor));
  box-shadow: 0 0 10px rgba(61, 255, 138, 0.45);
}

.arch-arrow::after {
  content: "";
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid var(--phosphor);
  margin-top: -7px;
  align-self: flex-end;
}

@media (max-width: 820px) {
  .arch-flow {
    grid-template-columns: 1fr;
  }

  .arch-arrow {
    flex-direction: row;
    min-height: 2rem;
    min-width: 0;
  }

  .arch-arrow::before {
    width: 2px;
    height: 1.4rem;
    max-width: none;
    background: linear-gradient(180deg, transparent, var(--phosphor));
  }

  .arch-arrow::after {
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 8px solid var(--phosphor);
    border-bottom: 0;
    margin-top: 0;
    align-self: center;
  }
}

.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
}

.card-list a {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: rgba(26, 36, 32, 0.55);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.card-list a:hover {
  border-color: rgba(61, 255, 138, 0.45);
  background: rgba(31, 168, 90, 0.12);
  transform: translateY(-2px);
}

.card-list .label {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 0.25rem;
}

.card-list .hint {
  display: block;
  color: var(--fog);
  font-size: 0.92rem;
}

footer {
  width: min(960px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 0 0 2.5rem;
  color: var(--fog);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes phosphor {
  0%,
  100% {
    text-shadow: 0 0 28px rgba(61, 255, 138, 0.28);
  }
  50% {
    text-shadow: 0 0 48px rgba(61, 255, 138, 0.5);
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 1.5rem;
  }

  .hero h1 {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .brand,
  .hero {
    animation: none;
  }
}