* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { overflow-x: hidden; }
body {
  font-family: 'Inter', sans-serif;
  background: #0b1020;
  color: #f8fafc;
  line-height: 1.7;
}
.background {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 18% 8%, rgba(255, 202, 40, 0.18), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(45, 212, 191, 0.16), transparent 30%),
    linear-gradient(135deg, #0b1020 0%, #111827 54%, #172033 100%);
  z-index: -2;
}
.grid-overlay {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 88%);
  z-index: -1;
}
.container { width: min(1040px, 92%); margin: auto; padding: 0 20px; }
header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  backdrop-filter: blur(18px);
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #5eead4;
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}
.logo::before {
  content: "PB";
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: #5eead4;
  color: #082f2e;
  font-size: 0.9rem;
}
nav.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  background: rgba(15,23,42,0.58);
}
nav.site-nav a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 0.9rem;
}
nav.site-nav a:hover,
nav.site-nav a:focus-visible {
  color: #082f2e;
  background: #5eead4;
  outline: none;
}
.breadcrumb { margin: 20px 0; font-size: 0.9rem; }
.breadcrumb ol { list-style: none; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; color: rgba(255,255,255,0.65); }
.breadcrumb li:not(:last-child)::after { content: "/"; color: rgba(255,255,255,0.45); margin-left: 8px; }
.breadcrumb a { color: rgba(255,255,255,0.7); text-decoration: none; }
.breadcrumb a:hover,
.breadcrumb li[aria-current="page"] { color: #5eead4; }
.tutorial-content { padding: 20px 0 80px; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  margin-bottom: 34px;
  transition: 0.2s ease;
}
.back-link:hover { color: #5eead4; }
.tutorial-header {
  padding: 44px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(255, 202, 40, 0.12), rgba(94,234,212,0.1)), rgba(255,255,255,0.045);
  box-shadow: 0 20px 70px rgba(0,0,0,0.28);
  margin-bottom: 34px;
}
.tutorial-header h1 {
  font-size: clamp(2.45rem, 6vw, 4.7rem);
  line-height: 0.98;
  letter-spacing: 0;
  margin-bottom: 22px;
}
.tutorial-header h1 span { color: #ffca28; }
.tutorial-header p { max-width: 780px; color: rgba(248,250,252,0.78); font-size: 1.13rem; }
.tutorial-meta,
.tutorial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.tutorial-meta span,
.tutorial-tags span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  color: rgba(248,250,252,0.78);
  font-size: 0.9rem;
}
.tutorial-tags span { background: rgba(94,234,212,0.12); color: #5eead4; }
.tutorial-section {
  margin: 24px 0;
  padding: 32px;
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 8px;
  background: rgba(255,255,255,0.045);
}
.tutorial-section h2 {
  display: flex;
  gap: 10px;
  align-items: center;
  color: #f8fafc;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.2;
  margin-bottom: 18px;
}
.tutorial-section h2 i { color: #ffca28; }
.tutorial-section h3 { margin: 22px 0 10px; color: #5eead4; font-size: 1.1rem; }
.tutorial-section p { color: rgba(248,250,252,0.76); margin-bottom: 16px; }
.tutorial-section ul,
.tutorial-section ol { margin: 0 0 18px 22px; color: rgba(248,250,252,0.76); }
.tutorial-section li { margin-bottom: 9px; }
.tutorial-section a { color: #5eead4; }
code {
  color: #fffbeb;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.92em;
}
.code-block {
  overflow-x: auto;
  margin: 18px 0;
  padding: 18px;
  border-radius: 8px;
  background: #020617;
  border: 1px solid rgba(94,234,212,0.18);
}
.code-block code {
  display: block;
  padding: 0;
  color: #d1fae5;
  background: transparent;
  border: 0;
  white-space: pre;
  font-size: 0.92rem;
  line-height: 1.65;
}
.note,
.reaction-callout {
  margin: 20px 0;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid rgba(94,234,212,0.24);
  background: rgba(94,234,212,0.09);
}
.warning { border-color: rgba(255,202,40,0.34); background: rgba(255,202,40,0.09); }
.note h4 { color: #f8fafc; margin-bottom: 8px; }
.source-list { margin-bottom: 0; }
.support-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  margin: 52px 0 8px;
  padding: 28px;
  border: 1px solid rgba(94,234,212,0.24);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(94,234,212,0.14), rgba(255,255,255,0.06));
  box-shadow: 0 18px 50px rgba(0,0,0,0.24);
}
.support-cta h2 { margin: 0 0 8px; font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1.2; }
.support-cta p { margin: 0; color: rgba(255,255,255,0.72); }
.support-cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  white-space: nowrap;
  padding: 13px 18px;
  border-radius: 8px;
  background: #5eead4;
  color: #082f2e;
  font-weight: 800;
  text-decoration: none;
}
footer { text-align: center; padding: 40px 0 60px; color: rgba(255,255,255,0.45); font-size: 0.95rem; }
@media (max-width: 1100px) {
  nav.site-nav { gap: 2px; }
  nav.site-nav a { font-size: 0.84rem; padding: 8px; }
}
@media (max-width: 900px) {
  nav.site-nav { display: none; }
  .tutorial-header, .tutorial-section { padding: 24px; }
  .support-cta { align-items: flex-start; flex-direction: column; }
  .support-cta-button { width: 100%; }
}