:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --success-bg: #f0fdf4;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --get-color: #16a34a;
  --get-bg: #f0fdf4;
  --post-color: #d97706;
  --post-bg: #fffbeb;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

canvas#bg {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.logo-icon { font-size: 1.3rem; }

nav { display: flex; gap: 1.5rem; align-items: center; }
nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: .9rem;
  transition: color .15s;
}
nav a:hover { color: var(--text); }

main { max-width: 1000px; margin: 0 auto; padding: 3rem 2rem 5rem; }

.hero { text-align: center; margin-bottom: 3rem; }
.hero h1 { font-size: 2.2rem; font-weight: 800; letter-spacing: -.02em; margin-bottom: .75rem; }
.hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 500px; margin: 0 auto 1.5rem; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: var(--primary-light);
  color: var(--primary);
  font-size: .8rem;
  font-weight: 600;
  padding: .3rem .8rem;
  border-radius: 999px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: .5rem;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.demos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

.demos > .card {
  flex: 1 1 280px;
  max-width: 320px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.card-desc { font-size: .85rem; color: var(--text-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .5rem 1rem;
  border-radius: 6px;
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background .15s, transform .1s;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-outline:hover { background: var(--surface-2); color: var(--text); }
.btn-sm { padding: .3rem .65rem; font-size: .78rem; }

.fact-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  font-size: .9rem;
  min-height: 180px;
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-style: italic;
  position: relative;
}
.fact-box.has-fact {
  color: var(--text);
  font-style: normal;
}
.fact-id {
  position: absolute;
  top: .4rem;
  right: .6rem;
  font-size: .7rem;
  color: var(--text-muted);
  background: var(--border);
  padding: .1rem .4rem;
  border-radius: 999px;
  font-style: normal;
}

.seen-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.seen-label { font-size: .78rem; color: var(--text-muted); }
.seen-ids {
  font-size: .78rem;
  font-family: monospace;
  color: var(--primary);
  background: var(--primary-light);
  padding: .2rem .5rem;
  border-radius: 4px;
  min-width: 40px;
}
.exclude-toggle { display: flex; align-items: center; gap: .4rem; font-size: .8rem; }

.facts-list-wrap {
  height: 250px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
}
.facts-list { list-style: none; }
.facts-list li {
  padding: .6rem 1rem;
  font-size: .82rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: .75rem;
  align-items: baseline;
}
.facts-list li:last-child { border-bottom: none; }
.fact-num {
  font-size: .7rem;
  color: var(--text-muted);
  font-family: monospace;
  min-width: 28px;
  flex-shrink: 0;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .6rem .8rem;
  font-size: .875rem;
  font-family: inherit;
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  transition: border-color .15s;
}
input[type="text"]:focus,
input[type="number"]:focus { border-color: var(--primary); background: var(--surface); }

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .6rem .8rem;
  font-size: .875rem;
  font-family: inherit;
  resize: vertical;
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  transition: border-color .15s;
}
textarea:focus { border-color: var(--primary); background: var(--surface); }

.char-count { font-size: .75rem; color: var(--text-muted); text-align: right; margin-top: -.5rem; }

.alert {
  padding: .6rem .9rem;
  border-radius: 6px;
  font-size: .83rem;
  font-weight: 500;
  display: none;
}
.alert.show { display: block; }
.alert-success { background: var(--success-bg); color: var(--success); }
.alert-error { background: var(--error-bg); color: var(--error); }

.endpoint-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.endpoint-header {
  padding: .85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  user-select: none;
  background: var(--surface);
  transition: background .15s;
}
.endpoint-header:hover { background: var(--surface-2); }

.method-badge {
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: .2rem .55rem;
  border-radius: 4px;
  flex-shrink: 0;
}
.method-get { background: var(--get-bg); color: var(--get-color); }
.method-post { background: var(--post-bg); color: var(--post-color); }

.endpoint-path {
  font-family: "SF Mono", "Fira Code", "Fira Mono", monospace;
  font-size: .88rem;
  font-weight: 600;
  flex: 1;
}
.endpoint-summary { font-size: .82rem; color: var(--text-muted); }
.chevron { transition: transform .2s; color: var(--text-muted); flex-shrink: 0; }
.endpoint-block.open .chevron { transform: rotate(90deg); }

.endpoint-body {
  display: none;
  padding: 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.endpoint-block.open .endpoint-body { display: block; }

.doc-section { margin-bottom: 1.1rem; }
.doc-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: .4rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .83rem;
}
th, td {
  text-align: left;
  padding: .45rem .75rem;
  border: 1px solid var(--border);
}
th { background: var(--surface-2); font-weight: 600; }
td code { font-size: .8rem; }

pre {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: .8rem;
  line-height: 1.65;
}
pre .kw { color: #7dd3fc; }
pre .str { color: #86efac; }
pre .num { color: #fca5a5; }
pre .comment { color: #64748b; font-style: italic; }

.copy-btn-wrap { position: relative; }
.copy-btn {
  position: absolute;
  top: .5rem;
  right: .5rem;
  background: rgba(255,255,255,.1);
  color: #94a3b8;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 4px;
  padding: .2rem .5rem;
  font-size: .72rem;
  cursor: pointer;
  transition: background .15s;
}
.copy-btn:hover { background: rgba(255,255,255,.2); color: #e2e8f0; }

@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
}
.spinner-dark {
  border-color: rgba(0,0,0,.12);
  border-top-color: var(--primary);
}

@media (max-width: 640px) {
  main { padding: 1.5rem 1rem 4rem; }
  .hero h1 { font-size: 1.6rem; }
  nav { display: none; }
}