:root {
  --bg: #0b0d10;
  --bg-soft: #12161b;
  --panel: #171c22;
  --panel-2: #1d232b;
  --text: #f4f6f8;
  --muted: #aab4bf;
  --line: #2b333d;
  --accent: #ff7a1a;
  --accent-2: #ffb347;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: inherit; }
code, pre { font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace; }
.container { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(11,13,16,.86);
  backdrop-filter: blur(14px);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; }
.brand-mark {
  width: 42px; height: 42px; display: grid; place-items: center;
  border-radius: 12px; background: linear-gradient(135deg, var(--accent), #d84b10);
  color: #111; font-size: .78rem; letter-spacing: .04em;
  box-shadow: 0 8px 30px rgba(255,122,26,.22);
}
.brand-text { letter-spacing: -.01em; }
.nav { display: flex; gap: 24px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-size: .95rem; font-weight: 600; }
.nav a:hover { color: var(--text); }

.hero {
  padding: 112px 0 92px;
  background:
    radial-gradient(circle at 18% 10%, rgba(255,122,26,.14), transparent 30%),
    radial-gradient(circle at 85% 30%, rgba(255,179,71,.08), transparent 28%),
    var(--bg);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 68px; align-items: center; }
.eyebrow { margin: 0 0 14px; color: var(--accent-2); font-size: .77rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; line-height: 1.08; letter-spacing: -.035em; }
h1 { max-width: 760px; font-size: clamp(3rem, 6vw, 5.5rem); margin-bottom: 24px; }
h2 { font-size: clamp(2rem, 3.8vw, 3.25rem); margin-bottom: 18px; }
h3 { font-size: 1.25rem; }
.hero-copy, .lead { color: var(--muted); font-size: 1.1rem; }
.hero-copy { max-width: 720px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 20px; border-radius: 12px;
  text-decoration: none; font-weight: 800; border: 1px solid var(--line);
}
.button.primary { background: var(--accent); color: #15100b; border-color: var(--accent); }
.button.primary:hover { background: #ff8b39; }
.button.secondary { background: rgba(255,255,255,.03); }
.button.secondary:hover { border-color: #56616d; }

.code-card {
  border: 1px solid var(--line); border-radius: 20px; overflow: hidden;
  background: #101419; box-shadow: 0 24px 80px rgba(0,0,0,.28);
}
.code-card-top { padding: 14px 18px; display: flex; gap: 8px; border-bottom: 1px solid var(--line); }
.code-card-top span { width: 10px; height: 10px; border-radius: 50%; background: #59626d; }
.code-card-top span:first-child { background: #ff6b5e; }
.code-card-top span:nth-child(2) { background: #f6c354; }
.code-card-top span:nth-child(3) { background: #55c27c; }
.code-card pre { margin: 0; padding: 28px; overflow-x: auto; color: #f7d7ba; font-size: .91rem; line-height: 1.8; }
.code-card > p { margin: 0; padding: 20px 28px 26px; border-top: 1px solid var(--line); color: var(--muted); }
.code-card code { color: #ffd5b0; }

.section { padding: 92px 0; }
.section.alt { background: var(--bg-soft); border-block: 1px solid rgba(255,255,255,.06); }
.section-heading { max-width: 760px; margin-bottom: 42px; }
.section-heading > p:last-child { color: var(--muted); }
.cards { display: grid; gap: 20px; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.card {
  min-height: 300px; padding: 28px; border: 1px solid var(--line); border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.015));
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: #4a5562; }
.card .tag { color: var(--accent-2); font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .13em; }
.card p:not(.tag) { color: var(--muted); }
.card a { display: inline-block; margin-top: 12px; color: var(--accent-2); text-decoration: none; font-weight: 800; }

.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.topic-grid article { padding: 26px; border: 1px solid var(--line); border-radius: 16px; background: #11161b; }
.topic-grid article p { margin-bottom: 0; color: var(--muted); }

.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 72px; align-items: start; }
.stacked-list { display: grid; gap: 12px; }
.stacked-list > div {
  display: grid; gap: 6px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 15px; background: var(--panel);
}
.stacked-list span { color: var(--muted); }

.interview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr);
  gap: 28px;
  align-items: start;
}
.qa-list { display: grid; gap: 14px; }
.library-label {
  margin: 0 0 4px;
  color: var(--accent-2);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.qa-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  overflow: hidden;
}
.qa-item[open] { border-color: #46515d; }
.qa-item summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 20px 54px 20px 22px;
  font-weight: 800;
  line-height: 1.4;
}
.qa-item summary::-webkit-details-marker { display: none; }
.qa-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 1.4rem;
  line-height: 1;
}
.qa-item[open] summary::after { content: "−"; }
.qa-item summary:hover { background: rgba(255,255,255,.025); }
.qa-answer {
  padding: 0 22px 20px;
  border-top: 1px solid rgba(255,255,255,.06);
  color: var(--muted);
}
.qa-answer p { margin: 16px 0 0; }
.qa-answer code { color: #ffd5b0; }
.qa-answer strong { color: var(--text); }

.premium-panel {
  position: sticky;
  top: 96px;
  padding: 28px;
  border-radius: 18px;
  border: 1px solid rgba(255,122,26,.38);
  background:
    linear-gradient(180deg, rgba(255,122,26,.10), rgba(255,255,255,.02)),
    var(--panel);
  box-shadow: 0 18px 50px rgba(0,0,0,.18);
}
.premium-panel .tag {
  margin: 0 0 12px;
  color: var(--accent-2);
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .13em;
}
.premium-panel > p:not(.tag) { color: var(--muted); }
.premium-panel ul {
  margin: 20px 0 0;
  padding-left: 20px;
  color: var(--muted);
}
.premium-panel li { margin: 8px 0; }
.premium-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: .9rem;
}

.about-card {
  display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px;
  padding: 44px; border-radius: 22px; border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(255,122,26,.09), rgba(255,255,255,.025));
}
.about-card p { color: var(--muted); }
.about-links { display: grid; gap: 12px; align-content: start; }
.about-links a {
  display: flex; justify-content: space-between; align-items: center; padding: 16px 18px;
  border-radius: 12px; border: 1px solid var(--line); text-decoration: none; font-weight: 700;
  background: rgba(255,255,255,.025);
}
.about-links a:hover { border-color: var(--accent); }

.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.footer-wrap { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }

@media (max-width: 900px) {
  .nav { display: none; }
  .hero { padding-top: 82px; }
  .hero-grid, .split, .about-card, .interview-grid { grid-template-columns: 1fr; gap: 38px; }
  .cards.three, .topic-grid { grid-template-columns: 1fr 1fr; }
  .about-card { padding: 32px; }
  .premium-panel { position: static; }
}

@media (max-width: 620px) {
  .container { width: min(var(--max), calc(100% - 28px)); }
  .brand-text { font-size: .92rem; }
  .hero { padding: 68px 0 64px; }
  h1 { font-size: clamp(2.55rem, 14vw, 4rem); }
  .section { padding: 68px 0; }
  .cards.three, .topic-grid { grid-template-columns: 1fr; }
  .footer-wrap { padding: 26px 0; flex-direction: column; align-items: flex-start; }
  .code-card pre { padding: 22px; font-size: .8rem; }
  .qa-item summary { padding: 18px 48px 18px 18px; }
  .qa-answer { padding: 0 18px 18px; }
  .premium-panel { padding: 22px; }
}