:root {
  --ink: #111114;
  --ink-soft: #55555e;
  --ink-faint: #8a8a94;
  --line: #e8e8ec;
  --accent: #0a58e0;
  --accent-soft: #eef3fd;
  --code-bg: #f6f6f8;
  --max: 680px;
  --radius: 8px;
  font-size: 17px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #ffffff;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 120px;
}

/* Header */
.site-header {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.site-header .mark {
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.site-header a {
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.site-header a.mark {
  color: var(--ink);
  border-bottom: none;
}

.site-header a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

.hero-logo {
  display: block;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
}

.ai-tip {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin: 28px 0 0;
  padding: 16px 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #f7faff, #ffffff);
}

.ai-tip svg {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  color: var(--accent);
  margin-top: 2px;
}

.ai-tip p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
  max-width: none;
}

.ai-tip strong {
  color: var(--ink);
}

/* Hero */
.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--line);
}

.hero .eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(1.9rem, 5vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 20px;
}

.hero .lede {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 56ch;
}

.hero .meta {
  margin-top: 28px;
  font-size: 0.82rem;
  color: var(--ink-faint);
  display: flex;
  gap: 24px;
}

/* Table of contents */
.toc {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.toc h2 {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-faint);
  margin-bottom: 16px;
}

.toc ol {
  list-style: none;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
}

.toc a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 9px 0;
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-bottom: 1px solid transparent;
}

.toc a::before {
  content: counter(toc, decimal-leading-zero);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink-faint);
}

.toc a:hover {
  color: var(--accent);
}

/* Steps */
.step {
  padding: 64px 0 8px;
  scroll-margin-top: 32px;
}

.step-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.step-head .step-num {
  margin-bottom: 0;
  flex: 0 0 auto;
}

.step-head h2 {
  margin-bottom: 0;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-size: 0.82rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.step h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.step p {
  color: var(--ink-soft);
  margin-bottom: 16px;
  max-width: 60ch;
}

.step p strong {
  color: var(--ink);
  font-weight: 600;
}

.step a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.step ul,
.step ol {
  margin: 0 0 16px 22px;
  color: var(--ink-soft);
}

.step li {
  margin-bottom: 8px;
  max-width: 58ch;
}

.step li strong {
  color: var(--ink);
  font-weight: 600;
}

/* Code */
code {
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84em;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 6px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 16px;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.8rem;
  line-height: 1.6;
}

/* Callouts */
.note {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 0 0 16px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.note strong {
  color: var(--ink);
}

/* Option cards */
.options {
  display: grid;
  gap: 12px;
  margin: 0 0 16px;
}

.option {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.option h3 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.option .tag {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 3px 9px;
}

.option p {
  font-size: 0.9rem;
  margin: 0;
}

/* Divider between steps */
.step + .step {
  border-top: 1px solid var(--line);
  margin-top: 56px;
}

/* Checklist */
.checklist {
  list-style: none;
  margin: 0 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.checklist li {
  margin: 0;
  padding: 13px 18px;
  max-width: none;
  font-size: 0.93rem;
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.checklist li + li {
  border-top: 1px solid var(--line);
}

.checklist li::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  position: relative;
  top: -2px;
}

/* Footer */
.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 24px 56px;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

@media (max-width: 600px) {
  :root {
    font-size: 16px;
  }
  .hero {
    padding: 48px 0 40px;
  }
  .step {
    padding: 44px 0 8px;
  }
}

/* Share bar */
.share {
  padding: 56px 0 8px;
  border-top: 1px solid var(--line);
  margin-top: 56px;
}

.share h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.share p {
  color: var(--ink-soft);
  margin-bottom: 18px;
  font-size: 0.95rem;
}

.share-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.share-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(17, 17, 20, 0.07);
}

.share-btn img {
  display: block;
}

/* Floating nav */
.floating-nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 28px;
  width: min(1040px, calc(100% - 32px));
  padding: 10px 12px 10px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  backdrop-filter: blur(14px) saturate(1.6);
  border: 1px solid rgba(17, 17, 20, 0.08);
  box-shadow: 0 8px 30px rgba(17, 17, 20, 0.07);
  animation: nav-in 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes nav-in {
  from { opacity: 0; transform: translate(-50%, -16px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-links a {
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-links a:hover {
  background: rgba(17, 17, 20, 0.05);
  color: var(--ink);
}

.nav-cta {
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(17, 17, 20, 0.22);
}


/* Fixed nav spacing */
.floating-nav + main .hero {
  padding-top: 150px;
}

.hero .meta {
  flex-wrap: wrap;
  row-gap: 8px;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .nav-cta {
    margin-left: auto;
  }
}

@media (max-width: 600px) {
  main {
    padding-left: 20px;
    padding-right: 20px;
  }
  .floating-nav + main .hero {
    padding-top: 118px;
  }
  pre {
    padding: 14px 16px;
  }
  .share-btn {
    padding: 9px 14px;
  }
}

@media (max-width: 420px) {
  .floating-nav {
    gap: 12px;
    padding: 8px 10px 8px 14px;
  }
  .nav-brand span {
    display: none;
  }
}

/* Pro footer */
.sfx {
  margin-top: 72px;
  border-top: 1px solid var(--line);
  background: #fafafa;
}

.sfx-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px 8px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-col h2 {
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-faint);
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin: 0;
  max-width: none;
}

.footer-col li a {
  display: inline-block;
  padding: 5px 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: none;
}

.footer-col li a:hover {
  color: var(--accent);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.footer-tag {
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 34ch;
}

.footer-note {
  margin: 16px 0 0;
  font-size: 0.78rem;
  color: var(--ink-faint);
  line-height: 1.6;
  max-width: 40ch;
}

.footer-note a {
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

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

.footer-bottom {
  max-width: 1080px;
  margin: 44px auto 0;
  padding: 18px 24px 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--ink-faint);
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brandcol {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .sfx-inner {
    padding: 44px 20px 8px;
  }
  .footer-col li a {
    padding: 7px 0;
  }
}