:root {
  --bg: #08090d;
  --bg-soft: #0d0f15;
  --panel: #11131b;
  --panel-2: #141722;
  --border: #1f2330;
  --border-soft: #181b26;
  --text: #e7e9f0;
  --muted: #9197a8;
  --muted-2: #6b7180;
  --accent: #7c9bff;
  --accent-2: #57e0c8;
  --accent-3: #b388ff;
  --warn: #ffb86b;
  --code-bg: #0a0c12;
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1080px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

code {
  font-family: var(--mono);
  font-size: 0.875em;
}

/* ---------- Background ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(to right, rgba(124,155,255,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124,155,255,0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}
.bg-glow {
  position: fixed;
  top: -260px;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 620px;
  z-index: -1;
  background:
    radial-gradient(circle at 30% 40%, rgba(124,155,255,0.22), transparent 60%),
    radial-gradient(circle at 70% 50%, rgba(87,224,200,0.16), transparent 60%),
    radial-gradient(circle at 50% 60%, rgba(179,136,255,0.14), transparent 60%);
  filter: blur(40px);
  pointer-events: none;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
  backdrop-filter: blur(12px);
}
.nav::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(8,9,13,0.6);
  border-bottom: 1px solid var(--border-soft);
  mask: linear-gradient(#000, #000);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand img { filter: invert(1); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 0.92rem;
  color: var(--muted);
}
.nav-links a { transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  padding: 7px 15px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text) !important;
  background: var(--panel);
  transition: border-color 0.15s, background 0.15s;
}
.nav-cta:hover { border-color: var(--accent); background: var(--panel-2); }

/* ---------- Layout ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; border-top: 1px solid var(--border-soft); }
.section-title {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.section-sub {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 0 44px;
}

/* ---------- Hero ---------- */
.hero {
  padding: 80px 0 72px;
  text-align: center;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(20,23,34,0.6);
  color: var(--muted);
  font-size: 0.82rem;
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
.pill .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px rgba(87,224,200,0.18);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.45} }

.hero h1 {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 800;
  margin: 26px 0 0;
}
.grad {
  background: linear-gradient(110deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  max-width: 660px;
  margin: 24px auto 0;
  font-size: 1.16rem;
  color: var(--muted);
}
.lede strong { color: var(--text); font-weight: 600; }

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin: 36px 0 40px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.97rem;
  transition: transform 0.12s, box-shadow 0.2s, border-color 0.15s, background 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: #07131a;
  background: linear-gradient(110deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 8px 30px -8px rgba(87,224,200,0.5);
}
.btn-primary:hover { box-shadow: 0 12px 40px -8px rgba(87,224,200,0.65); }
.btn-ghost {
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--panel);
}
.btn-ghost:hover { border-color: var(--accent); }

.endpoint {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
  padding: 12px 12px 12px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--code-bg);
  max-width: 100%;
  flex-wrap: wrap;
  justify-content: center;
}
.endpoint-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted-2);
}
.endpoint code { color: var(--accent-2); font-size: 0.95rem; word-break: break-all; }

/* ---------- Flow ---------- */
.flow {
  display: flex;
  align-items: stretch;
  gap: 12px;
  flex-wrap: wrap;
}
.flow-step {
  flex: 1 1 240px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg-soft) 100%);
  position: relative;
  overflow: hidden;
}
.flow-step::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}
.flow-num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.flow-step h3 { margin: 10px 0 8px; font-size: 1.2rem; letter-spacing: -0.01em; }
.flow-step p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.flow-step code { color: var(--accent-2); }
.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--muted-2);
  font-size: 1.4rem;
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 22px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  width: fit-content;
  max-width: 100%;
}
.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.tab:hover { color: var(--text); }
.tab.is-active {
  color: var(--text);
  background: var(--panel-2);
  box-shadow: inset 0 0 0 1px var(--border);
}

.panel { display: none; animation: fade 0.25s ease; }
.panel.is-active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.steps {
  margin: 0 0 18px;
  padding-left: 22px;
  color: var(--muted);
}
.steps li { margin: 6px 0; }
.steps code, .steps em { color: var(--text); font-style: normal; }
.steps code { color: var(--accent-2); }

/* ---------- Code block ---------- */
.code {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  overflow: hidden;
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.015);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted-2);
}
.code pre {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.65;
  color: #c8d0e6;
}
.copy-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 5px 12px;
  border-radius: 7px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent-2); border-color: var(--accent-2); }

/* ---------- Tools ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}
.tool-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color 0.18s, transform 0.18s;
}
.tool-card:hover { border-color: rgba(124,155,255,0.5); transform: translateY(-2px); }
.tool-card--charge { border-color: rgba(255,184,107,0.35); background: linear-gradient(180deg, rgba(255,184,107,0.05), var(--panel)); }
.tool-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.tool-top code { color: var(--accent); font-size: 0.92rem; font-weight: 500; }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.tool-card p code { color: var(--accent-2); }
.tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 9px;
  border-radius: 999px;
}
.tag-free { color: var(--accent-2); background: rgba(87,224,200,0.1); border: 1px solid rgba(87,224,200,0.25); }
.tag-charge { color: var(--warn); background: rgba(255,184,107,0.1); border: 1px solid rgba(255,184,107,0.3); }

.resources {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding: 16px 18px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
}
.resources-label { color: var(--muted-2); font-size: 0.82rem; margin-right: 4px; }
.resources code {
  color: var(--accent-3);
  background: rgba(179,136,255,0.08);
  padding: 4px 10px;
  border-radius: 7px;
}

/* ---------- Payment ---------- */
.payment-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.payment-copy p { color: var(--muted); }
.payment-copy code { color: var(--accent-2); }
.payment-copy strong { color: var(--text); }
.check-list { list-style: none; padding: 0; margin: 18px 0 0; }
.check-list li {
  position: relative;
  padding-left: 28px;
  margin: 10px 0;
  color: var(--muted);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}
.check-list em { color: var(--text); font-style: normal; }
.payment-spec {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 8px 20px;
  align-self: start;
}
.spec-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
}
.spec-row:last-child { border-bottom: none; }
.spec-row span { color: var(--muted); font-size: 0.9rem; }
.spec-row code { color: var(--text); }
.pay-demo-label { color: var(--muted); margin: 0 0 14px; font-size: 0.95rem; }

/* ---------- Footer ---------- */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 64px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
  text-align: center;
}
.footer-brand { display: flex; align-items: center; gap: 9px; font-weight: 600; }
.footer-brand img { filter: invert(1); opacity: 0.9; }
.footer-links { display: flex; gap: 22px; color: var(--muted); font-size: 0.92rem; }
.footer-links a:hover { color: var(--text); }
.footer-note { color: var(--muted-2); font-size: 0.82rem; margin: 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 11px 20px;
  border-radius: 10px;
  background: var(--panel-2);
  border: 1px solid var(--accent-2);
  color: var(--text);
  font-size: 0.88rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .section { padding: 64px 0; }
  .flow-arrow { display: none; }
  .payment-inner { grid-template-columns: 1fr; }
}