/* ───────────────────────── design tokens ───────────────────────── */
:root {
  --bg: #0b0e14;
  --bg-elev: #12161f;
  --bg-elev-2: #1a1f2b;
  --border: #242b3a;
  --border-strong: #323a4d;
  --fg: #e6eaf3;
  --fg-muted: #9aa3b5;
  --fg-dim: #6b7486;
  --accent: #5eead4; /* teal */
  --accent-strong: #2dd4bf;
  --accent-dim: #0f766e;
  --danger: #f87171;
  --warn: #fbbf24;
  --ok: #4ade80;
  --maxw: 1120px;
  --radius: 12px;
  --radius-lg: 18px;
  --font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow-lg: 0 12px 40px -8px rgb(0 0 0 / 0.5), 0 2px 8px rgb(0 0 0 / 0.25);
}

/* ───────────────────────── reset ───────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
}
code,
pre,
kbd {
  font-family: var(--font-mono);
}
code {
  font-size: 0.92em;
  color: var(--accent);
  background: rgb(94 234 212 / 0.08);
  padding: 0.12em 0.38em;
  border-radius: 5px;
  border: 1px solid rgb(94 234 212 / 0.15);
}
h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.15;
}

/* ───────────────────────── subtle grid background ───────────────────────── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgb(94 234 212 / 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(94 234 212 / 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 20%, black 0%, transparent 75%);
  z-index: 0;
}

main > section,
.site-header,
.site-footer {
  position: relative;
  z-index: 1;
}

/* ───────────────────────── header ───────────────────────── */
.site-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 28px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--fg-muted);
}
.site-nav a:hover {
  color: var(--fg);
}
.icon-link {
  display: inline-flex;
  align-items: center;
  color: var(--fg-muted);
}
.icon-link:hover {
  color: var(--accent);
}

/* ───────────────────────── hero ───────────────────────── */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 28px 80px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.04;
}
.hero h1 .accent {
  color: var(--accent);
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-strong) 60%, #93c5fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 48ch;
  margin: 24px 0 32px;
}
.lede--muted {
  color: var(--fg-dim);
}
.hero__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.cmd {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 14px 18px;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  position: relative;
  transition: border-color 0.2s, background 0.2s;
}
.cmd:hover,
.cmd:focus-visible {
  border-color: var(--accent-dim);
  background: var(--bg-elev-2);
  outline: none;
}
.cmd__prompt {
  color: var(--accent);
  user-select: none;
}
.cmd__copy {
  margin-left: 8px;
  color: var(--fg-dim);
  font-size: 13px;
  transition: color 0.15s;
}
.cmd.copied .cmd__copy {
  color: var(--ok);
}
.cmd.copied .cmd__copy::after {
  content: "  copied";
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid transparent;
  transition:
    background 0.15s,
    border-color 0.15s,
    color 0.15s;
  cursor: pointer;
  font-family: inherit;
}
.btn--accent {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn--accent:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border-strong);
}
.btn--ghost:hover {
  background: var(--bg-elev);
  border-color: var(--accent-dim);
}

.hero__meta {
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--fg-dim);
}

/* ───────────────────────── hero diagram ───────────────────────── */
.hero__diagram {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.diagram-frame {
  background: linear-gradient(180deg, var(--bg-elev) 0%, var(--bg) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.diagram-frame svg {
  width: 100%;
  height: auto;
  max-height: 400px;
}
.diagram-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--fg-dim);
  padding: 0 6px;
}
#fleet-status {
  color: var(--accent);
  font-weight: 500;
}
kbd {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 5px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  font-size: 11px;
  color: var(--fg-muted);
}

/* SVG node styles */
.node {
  cursor: pointer;
  transition: transform 0.2s;
}
.node:focus {
  outline: none;
}
.node__bg {
  fill: var(--bg-elev);
}
.node__ring {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.5;
  transition: stroke 0.2s, stroke-width 0.2s;
}
.node--reviewer .node__ring {
  stroke: var(--accent-dim);
  stroke-width: 2;
}
.node:hover .node__ring,
.node:focus-visible .node__ring,
.node.active .node__ring {
  stroke: var(--accent);
  stroke-width: 2.5;
  filter: url(#glow);
}
.node__title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  fill: var(--fg);
  text-anchor: middle;
  pointer-events: none;
  user-select: none;
}
.node__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--fg-dim);
  text-anchor: middle;
  pointer-events: none;
  user-select: none;
}
.node__cap {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--accent);
  text-anchor: middle;
  pointer-events: none;
  user-select: none;
}
.edge-label {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--fg-muted);
  text-anchor: middle;
}
.edge-label--sub {
  font-size: 10px;
  fill: var(--fg-dim);
}
.click-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--fg-dim);
  letter-spacing: 0.05em;
}

/* ───────────────────────── use cases ───────────────────────── */
.uses {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px 28px 60px;
}
.uses__header {
  max-width: 760px;
  margin-bottom: 36px;
}
.uses__header h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin-bottom: 16px;
}
.uses__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.use-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s, transform 0.2s;
}
.use-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}
.use-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.use-card__glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgb(94 234 212 / 0.1);
  color: var(--accent);
  border: 1px solid rgb(94 234 212 / 0.2);
}
.use-card h3 {
  font-size: 17px;
  margin: 0;
  letter-spacing: -0.01em;
}
.use-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--fg-muted);
  flex: 1;
}
.use-card__code {
  align-self: flex-start;
  background: var(--bg);
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  margin-top: 6px;
}

/* ───────────────────────── validator ───────────────────────── */
.validator {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 60px 28px;
}
.validator__header {
  max-width: 780px;
  margin-bottom: 36px;
}
.validator__header h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin-bottom: 18px;
}
.validator__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 20px;
  min-height: 440px;
}
.editor {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.editor__tab {
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev-2);
}
#yaml-input {
  flex: 1;
  min-height: 380px;
  resize: vertical;
  border: none;
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--fg);
  background: transparent;
  outline: none;
  tab-size: 2;
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
}

.findings {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.findings__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
}
.findings__title {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--fg-muted);
}
.findings__list {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-y: auto;
  flex: 1;
}
.findings__placeholder,
.finding {
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.findings__placeholder {
  color: var(--fg-dim);
  font-style: italic;
}
.finding__tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  line-height: 1.4;
  margin-top: 2px;
  text-transform: uppercase;
}
.finding--ok .finding__tag {
  background: rgb(74 222 128 / 0.15);
  color: var(--ok);
}
.finding--warn .finding__tag {
  background: rgb(251 191 36 / 0.15);
  color: var(--warn);
}
.finding--error .finding__tag {
  background: rgb(248 113 113 / 0.15);
  color: var(--danger);
}
.finding__body {
  flex: 1;
  min-width: 0;
}
.finding__code {
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 2px;
}
.finding--ok .finding__code {
  color: var(--ok);
}
.finding--warn .finding__code {
  color: var(--warn);
}
.finding--error .finding__code {
  color: var(--danger);
}
.finding__msg {
  color: var(--fg-muted);
  word-break: break-word;
}

/* ───────────────────────── how it works ───────────────────────── */
.howto {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 28px;
}
.howto__header {
  text-align: center;
  margin-bottom: 56px;
}
.howto__header h2 {
  font-size: clamp(28px, 3.5vw, 44px);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.step {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s, transform 0.2s;
}
.step:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}
.step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.step h3 {
  font-size: 20px;
}
.step p {
  color: var(--fg-muted);
  margin: 0;
  font-size: 14.5px;
}
.step__code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--fg);
}
.step__code code {
  background: transparent;
  color: var(--fg);
  border: none;
  padding: 0;
  font-size: inherit;
  white-space: pre;
}

/* ───────────────────────── why this ───────────────────────── */
.why {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 60px 28px;
}
.why__header {
  margin-bottom: 36px;
}
.why__header h2 {
  font-size: clamp(28px, 3.5vw, 40px);
}
.why__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.why__card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: border-color 0.2s;
}
.why__card:hover {
  border-color: var(--accent-dim);
}
.why__card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--accent);
}
.why__card p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 14.5px;
  line-height: 1.65;
}

/* ───────────────────────── install ───────────────────────── */
.install {
  padding: 80px 28px 60px;
  background: radial-gradient(
    ellipse at 50% 0%,
    rgb(94 234 212 / 0.08) 0%,
    transparent 60%
  );
}
.install__inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.install__inner h2 {
  font-size: clamp(32px, 4vw, 52px);
  margin-bottom: 28px;
}
.install__block {
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 22px 24px;
  text-align: left;
  font-size: 14px;
  line-height: 1.7;
  margin: 0 0 28px;
}
.install__block code {
  background: transparent;
  color: var(--fg);
  border: none;
  padding: 0;
  font-size: inherit;
  white-space: pre;
}
.install__links {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ───────────────────────── footer ───────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 28px 48px;
  margin-top: 40px;
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 28px;
  align-items: center;
  font-size: 13.5px;
  color: var(--fg-muted);
}
.site-footer__brand {
  display: flex;
  flex-direction: column;
}
.site-footer__brand span:first-child {
  font-weight: 700;
  font-size: 15px;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.site-footer__tagline {
  color: var(--fg-dim);
  font-size: 13px;
  margin-top: 3px;
}
.site-footer__links {
  display: flex;
  gap: 22px;
}
.site-footer__links a:hover {
  color: var(--fg);
}
.site-footer__legal {
  display: flex;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-dim);
}

/* ───────────────────────── responsive ───────────────────────── */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 48px 24px 60px;
    gap: 40px;
  }
  .hero h1 br {
    display: none;
  }
  .validator__grid {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .why__grid {
    grid-template-columns: 1fr;
  }
  .uses__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .site-header {
    padding: 22px 20px 8px;
  }
  .site-nav {
    gap: 20px;
  }
  .hero,
  .uses,
  .validator,
  .howto,
  .why,
  .install {
    padding-left: 20px;
    padding-right: 20px;
  }
  .uses__grid {
    grid-template-columns: 1fr;
  }
  .site-footer__inner {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }
  .cmd {
    justify-content: center;
  }
  .btn {
    justify-content: center;
  }
}