:root {
  --ink: #0b1f1a;
  --ink-soft: #16332b;
  --paper: #f4f7f2;
  --paper-2: #e8efe4;
  --lime: #b8f25a;
  --lime-deep: #8fd12a;
  --muted: #5a6f67;
  --line: rgba(11, 31, 26, 0.12);
  --code-bg: #0f2a23;
  --code-fg: #d7f5c2;
  --warn: #c45c26;
  --radius: 14px;
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "Manrope", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(184, 242, 90, 0.28), transparent 55%),
    radial-gradient(900px 420px at 100% 0%, rgba(22, 51, 43, 0.12), transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, #eef3eb 100%);
  min-height: 100vh;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration: none;
}

code,
pre {
  font-family: var(--font-mono);
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(244, 247, 242, 0.86);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  height: 36px;
  width: auto;
  display: block;
}

.top-meta {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Hero */
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 22px 28px;
  display: grid;
  gap: 18px;
  animation: rise 0.7s ease both;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--lime);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  max-width: 12ch;
}

.hero h1 span {
  color: var(--lime-deep);
  background: linear-gradient(90deg, var(--ink), var(--ink));
  -webkit-background-clip: text;
}

.hero p {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.chip {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.chip strong {
  font-weight: 700;
}

/* Layout */
.layout {
  max-width: 1120px;
  margin: 0 auto;
  padding: 10px 22px 64px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 78px;
  padding: 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
  animation: rise 0.8s ease 0.08s both;
}

.sidebar h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar a {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.sidebar a:hover,
.sidebar a.active {
  background: var(--ink);
  color: var(--lime);
  transform: translateX(2px);
}

.sidebar .sub {
  margin-left: 8px;
  padding-left: 10px;
  border-left: 2px solid var(--line);
}

.content {
  display: flex;
  flex-direction: column;
  gap: 22px;
  animation: rise 0.85s ease 0.12s both;
}

.panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  padding: 26px 26px 22px;
  box-shadow: 0 18px 40px rgba(11, 31, 26, 0.05);
}

.panel h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.7rem;
  letter-spacing: -0.02em;
}

.panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.panel > p,
.lead {
  margin: 0 0 16px;
  color: var(--muted);
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 18px 0 6px;
}

.flow-4 {
  grid-template-columns: repeat(2, 1fr);
}

.flow-step {
  position: relative;
  padding: 16px;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--paper-2), #fff);
  border: 1px solid var(--line);
  overflow: hidden;
}

.flow-step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--lime);
}

.flow-step .n {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--lime-deep);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.flow-step h4 {
  margin: 6px 0 6px;
  font-size: 1rem;
  font-family: var(--font-display);
}

.flow-step p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

.info-card {
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--ink);
  color: #e7f7dc;
}

.info-card.alt {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.info-card .label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 6px;
}

.info-card code {
  font-size: 0.9rem;
  word-break: break-all;
}

.endpoint {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 14px 0 16px;
}

.method {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 6px 10px;
  border-radius: 8px;
  color: var(--ink);
  background: var(--lime);
}

.method.post {
  background: #ffd56a;
}

.method.socket {
  background: #7ad7ff;
}

.url {
  flex: 1;
  min-width: 220px;
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-fg);
  font-size: 0.84rem;
  overflow-x: auto;
}

.section-title {
  margin: 22px 0 8px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.params {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 16px;
  font-size: 0.92rem;
}

.params th,
.params td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.params th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.params code {
  background: var(--paper-2);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.84rem;
}

.badge {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(184, 242, 90, 0.35);
  color: var(--ink);
}

.badge.opt {
  background: rgba(90, 111, 103, 0.15);
  color: var(--muted);
}

pre.block {
  margin: 8px 0 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-fg);
  font-size: 0.82rem;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.code-wrap {
  position: relative;
  margin: 8px 0 0;
}

.code-wrap pre.block,
.code-wrap pre.url {
  margin: 0;
  padding-right: 88px;
}

.code-wrap pre.url {
  flex: initial;
  width: 100%;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(183, 242, 90, 0.28);
  background: rgba(11, 31, 26, 0.72);
  color: var(--lime);
  border-radius: 8px;
  padding: 6px 10px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.copy-btn:hover {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--lime);
}

.copy-btn.copied {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--lime);
}

.endpoint .code-wrap {
  flex: 1;
  min-width: 220px;
  margin: 0;
}

.note {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px dashed rgba(196, 92, 38, 0.45);
  background: rgba(196, 92, 38, 0.08);
  color: #6d3414;
  font-size: 0.9rem;
}

.divider {
  height: 1px;
  background: var(--line);
  margin: 26px 0;
}

.footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 22px 40px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.88rem;
}

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

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

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .flow,
  .flow-4 {
    grid-template-columns: 1fr;
  }

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

  .footer {
    flex-direction: column;
  }
}