:root {
  --bg-1: #08141b;
  --bg-2: #0f2430;
  --bg-3: #153849;
  --line: #2f586a;
  --ink: #e8f2f6;
  --muted: #9eb8c4;
  --accent: #82e5b3;
  --accent-2: #6bc3ff;
  --card: rgba(11, 35, 46, 0.78);
  --radar-glow: rgba(130, 229, 179, 0.26);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 15% 8%, #1d4659 0%, transparent 35%),
    radial-gradient(circle at 82% 14%, #14394a 0%, transparent 38%),
    linear-gradient(170deg, var(--bg-1) 0%, var(--bg-2) 45%, var(--bg-3) 100%);
  line-height: 1.5;
}

.page-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(107, 195, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107, 195, 255, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at 50% 20%, black 45%, transparent 85%);
}

.topbar,
main,
.footer {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0 0.6rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--accent-2);
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-family: "IBM Plex Mono", monospace;
  color: var(--accent);
  font-weight: 500;
}

.brand-title {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.top-link {
  color: var(--accent-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  font-size: 0.92rem;
}

.top-link:hover {
  border-bottom-color: var(--accent-2);
}

.top-link-accent {
  color: var(--accent);
  font-weight: 500;
}

.top-link-accent:hover {
  border-bottom-color: var(--accent);
}

.inline-link {
  color: var(--accent-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(107, 195, 255, 0.4);
  transition: border-color 140ms;
}

.inline-link:hover {
  border-bottom-color: var(--accent-2);
}

.inline-code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85em;
  color: var(--accent-2);
  background: rgba(107, 195, 255, 0.1);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.panel-lead {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 72ch;
}

.panel-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-style: italic;
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 5.6rem max(4vw, calc((100vw - 1080px) / 2)) 2.6rem;
  width: 100vw;
  margin-left: calc(-1 * (100vw - 100%) / 2);
  animation: rise 560ms ease-out both;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 65ch;
}

.hero-radar {
  position: absolute;
  inset: 0;
  opacity: 0.95;
  z-index: 1;
  pointer-events: none;
}

#radar-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.05rem, 6.2vw, 4rem);
  line-height: 1.06;
  max-width: 15ch;
}

.hero-copy {
  max-width: 62ch;
  color: var(--muted);
  margin: 1rem 0 1.6rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.6rem;
}

.btn {
  text-decoration: none;
  font-weight: 500;
  border-radius: 999px;
  padding: 0.68rem 1rem;
  font-size: 0.92rem;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent) 0%, #6bf0dc 100%);
  color: #032113;
  box-shadow: 0 8px 24px rgba(130, 229, 179, 0.22);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
  background: rgba(10, 29, 39, 0.4);
}

.hero-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-metrics span {
  color: var(--accent-2);
  font-family: "IBM Plex Mono", monospace;
  margin-right: 0.25rem;
}

.panel {
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(5px);
  border-radius: 16px;
  padding: 1.45rem;
  margin: 1rem 0;
  animation: rise 620ms ease-out both;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.35rem, 2.9vw, 2.1rem);
}

.panel p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 0.9rem;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  border: 1px solid rgba(95, 148, 168, 0.5);
  border-radius: 12px;
  background: rgba(8, 29, 38, 0.72);
  padding: 1rem;
}

.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.02rem;
}

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

.card.accent {
  border-color: rgba(130, 229, 179, 0.6);
  background: rgba(13, 43, 47, 0.76);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: center;
}

.code {
  border: 1px solid rgba(107, 195, 255, 0.4);
  border-radius: 10px;
  background: #07171f;
  overflow: auto;
}

.code pre {
  margin: 0;
  padding: 1rem;
}

.code code {
  color: #a9dff7;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.83rem;
  line-height: 1.55;
}

.cta {
  text-align: center;
  margin: 1.35rem 0 1.6rem;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(9, 33, 43, 0.9) 0%, rgba(7, 22, 31, 0.92) 100%);
  border-radius: 16px;
  padding: 1.8rem 1rem;
  animation: rise 700ms ease-out both;
}

.cta h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
}

.cta p {
  margin: 0.55rem auto 1rem;
  max-width: 60ch;
  color: var(--muted);
}

.footer {
  padding: 0.4rem 0 1.6rem;
}

.footer p {
  margin: 0;
  color: #8ca7b4;
  font-size: 0.85rem;
}

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

@media (max-width: 940px) {
  .grid.three,
  .grid.two,
  .split {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3.8rem;
  }

  .hero-radar {
    opacity: 0.7;
  }
}

@media (max-width: 540px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .hero h1 {
    font-size: clamp(1.85rem, 10vw, 2.4rem);
  }

  .hero-radar {
    opacity: 0.6;
  }

  .panel,
  .cta {
    padding: 1.1rem;
  }
}

/* ─── Weight class table ─────────────────────────────────────── */

.weight-table-wrap {
  overflow-x: auto;
  margin: 1rem 0 0.5rem;
}

.weight-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.weight-table th {
  text-align: left;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

.weight-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid rgba(47, 88, 106, 0.4);
  color: var(--muted);
  vertical-align: top;
}

.wc-badge {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.2em 0.55em;
  border-radius: 4px;
  display: inline-block;
  white-space: nowrap;
}

.wc-badge-super     { background: rgba(130,229,179,0.14); color: var(--accent);   border: 1px solid rgba(130,229,179,0.4); }
.wc-badge-heavy     { background: rgba(107,195,255,0.14); color: var(--accent-2); border: 1px solid rgba(107,195,255,0.4); }
.wc-badge-medium    { background: rgba(200,170,255,0.12); color: #c8aaff;         border: 1px solid rgba(200,170,255,0.35); }
.wc-badge-light     { background: rgba(255,200,100,0.10); color: #f0c060;         border: 1px solid rgba(255,200,100,0.3); }
.wc-badge-ultralight{ background: rgba(200,210,220,0.10); color: var(--muted);    border: 1px solid rgba(200,210,220,0.25); }

/* ─── Stability tier table ───────────────────────────────────── */

.tier-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 0.75rem 0;
}

.tier-table th {
  text-align: left;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

.tier-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid rgba(47, 88, 106, 0.4);
  color: var(--muted);
  vertical-align: top;
}

.tier-badge {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.2em 0.55em;
  border-radius: 4px;
  display: inline-block;
  white-space: nowrap;
}

.tier-locked      { background: rgba(255,80,80,0.12);    color: #ff6b6b; border: 1px solid rgba(255,80,80,0.35); }
.tier-sensitive   { background: rgba(255,170,50,0.12);   color: #ffaa33; border: 1px solid rgba(255,170,50,0.35); }
.tier-stable      { background: rgba(107,195,255,0.12);  color: var(--accent-2); border: 1px solid rgba(107,195,255,0.35); }
.tier-active      { background: rgba(130,229,179,0.12);  color: var(--accent);   border: 1px solid rgba(130,229,179,0.35); }
.tier-experimental{ background: rgba(200,200,200,0.10);  color: var(--muted);    border: 1px solid rgba(200,200,200,0.25); }
.tier-deprecated  { background: rgba(100,100,100,0.10);  color: #7a7a7a;         border: 1px solid rgba(100,100,100,0.25); }

/* ─── Field reference table ──────────────────────────────────── */

.field-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 0.75rem 0;
}

.field-table th {
  text-align: left;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--line);
}

.field-table td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid rgba(47, 88, 106, 0.4);
  color: var(--muted);
  vertical-align: top;
}

.field-table td:first-child {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent-2);
  white-space: nowrap;
}

.req { font-size: 0.78rem; color: var(--accent);  font-family: "IBM Plex Mono", monospace; }
.opt { font-size: 0.78rem; color: var(--muted);   font-family: "IBM Plex Mono", monospace; }

/* ─── Code tabs ──────────────────────────────────────────────── */

.code-tabs {
  border: 1px solid rgba(107, 195, 255, 0.4);
  border-radius: 10px;
  overflow: hidden;
  margin: 0.75rem 0;
}

.code-tab-bar {
  display: flex;
  background: #07171f;
  border-bottom: 1px solid rgba(107, 195, 255, 0.2);
  overflow-x: auto;
}

.code-tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 140ms, border-color 140ms;
}

.code-tab-btn:hover { color: var(--ink); }
.code-tab-btn.active { color: var(--accent-2); border-bottom-color: var(--accent-2); }

.code-tab-panel { display: none; background: #07171f; }
.code-tab-panel.active { display: block; }

.code-tab-panel pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
}

.code-tab-panel code {
  color: #a9dff7;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.83rem;
  line-height: 1.6;
}

/* ─── Docs page layout ───────────────────────────────────────── */

.docs-wrap {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
  padding: 2rem 0 3rem;
}

.docs-sidebar {
  position: sticky;
  top: 1.5rem;
}

.docs-sidebar-title {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.6rem;
}

.docs-sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.docs-sidebar a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: color 220ms ease, border-color 220ms ease, background 220ms ease, padding-left 220ms ease;
}

.docs-sidebar a:hover {
  color: var(--ink);
  border-left-color: var(--accent);
  background: rgba(130, 229, 179, 0.06);
  padding-left: 0.95rem;
}

.docs-content { min-width: 0; }

.docs-section {
  margin-bottom: 3rem;
  scroll-margin-top: 1.5rem;
}

.docs-section + .docs-section {
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.docs-section h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
  margin: 0 0 0.6rem;
}

.docs-section h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.35rem;
  color: var(--accent-2);
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
}

.docs-section p {
  color: var(--muted);
  margin: 0 0 0.75rem;
  max-width: 72ch;
}

/* Quickstart steps */
.step-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.step {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.85rem;
  align-items: start;
}

.step-num {
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--accent-2);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent-2);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.step-body h4 {
  margin: 0 0 0.25rem;
  font-size: 0.97rem;
}

.step-body p {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* GitHub / download links */
.gh-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* ─── Docs responsive ────────────────────────────────────────── */

@media (max-width: 780px) {
  .docs-wrap {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .docs-sidebar {
    position: static;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.85rem;
    background: var(--card);
  }

  .docs-sidebar ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .docs-sidebar a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 0.25rem 0.5rem;
  }

  .docs-sidebar a:hover {
    border-left-color: transparent;
    border-bottom-color: var(--line);
  }
}