:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --text: #171a17;
  --muted: #5d665f;
  --line: #d9ddd8;
  --accent: #145c3b;
  --accent-dark: #0d432b;
  --accent-soft: #e6f0e9;
  --code: #111613;
  --shadow: 0 18px 50px rgba(24, 34, 27, 0.08);
}

* { 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: 1.6;
}
a { color: inherit; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.site-header {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--accent);
  color: #fff;
  font-size: 0.86rem;
}
nav { display: flex; flex-wrap: wrap; gap: 20px; }
nav a, footer a { text-decoration: none; color: var(--muted); font-weight: 650; }
nav a:hover, footer a:hover { color: var(--accent); }
main { overflow: hidden; }
.hero {
  width: min(1080px, calc(100% - 32px));
  margin: 72px auto 64px;
  text-align: center;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 800;
}
h1, h2, h3 { line-height: 1.1; letter-spacing: -0.035em; }
h1 { margin: 0 auto 24px; max-width: 900px; font-size: clamp(3rem, 7vw, 6.4rem); }
h2 { margin: 0 0 20px; font-size: clamp(2rem, 4vw, 3.8rem); }
h3 { margin: 0 0 12px; font-size: 1.28rem; }
p { margin: 0 0 18px; }
.hero-copy { max-width: 820px; margin: 0 auto 16px; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.32rem); }
.actions { margin-top: 34px; display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 12px;
  text-decoration: none;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
}
.button.primary { background: var(--accent); color: #fff; }
.button.primary:hover { background: var(--accent-dark); }
.button.secondary { background: var(--surface); border: 1px solid var(--line); }
.platform-actions {
  margin: 38px auto 0;
  max-width: 980px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
}
.platform-button {
  grid-column: span 2;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 88px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(24, 34, 27, 0.06);
  text-align: left;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}
.platform-button:nth-child(4), .platform-button:nth-child(5) { grid-column: span 3; }
.platform-button:hover {
  transform: translateY(-3px);
  border-color: #aab4ac;
  box-shadow: 0 16px 36px rgba(24, 34, 27, 0.12);
}
.platform-button strong, .platform-button small { display: block; }
.platform-button strong { font-size: 1rem; line-height: 1.2; }
.platform-button small { margin-top: 4px; color: var(--muted); font-size: 0.8rem; line-height: 1.35; }
.platform-icon {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: #fff;
  font-size: 0.92rem;
  font-weight: 900;
  letter-spacing: -0.04em;
}
.platform-button.claude .platform-icon { background: #c15f3c; }
.platform-button.chatgpt .platform-icon { background: #111; }
.platform-button.gemini .platform-icon { background: linear-gradient(135deg, #3154d9, #9b56d9); }
.platform-button.guide .platform-icon { background: var(--accent); }
.platform-button.source .platform-icon { background: #333a35; font-size: 0.72rem; }
.proof-strip {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.proof-strip div { padding: 24px; border-right: 1px solid var(--line); }
.proof-strip div:last-child { border-right: 0; }
.proof-strip strong, .proof-strip span { display: block; }
.proof-strip span { margin-top: 8px; color: var(--muted); font-size: 0.92rem; }
.section {
  width: min(1160px, calc(100% - 32px));
  margin: 120px auto;
}
.section-heading { max-width: 780px; margin-bottom: 42px; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.card p { color: var(--muted); margin: 0; }
.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center; }
.split > div:first-child p { color: var(--muted); font-size: 1.08rem; }
.code-panel { background: var(--code); color: #e8eee9; border-radius: 18px; padding: 28px; box-shadow: var(--shadow); }
.code-title { color: #9db6a6; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 800; }
pre { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.comparison > div { padding: 30px; border-radius: 16px; border: 1px solid var(--line); background: var(--surface); }
.comparison > div:last-child { background: var(--accent-soft); border-color: #b9d0c1; }
.label { display: inline-block; margin-bottom: 14px; color: var(--accent); font-size: 0.76rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.1em; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 800; }
.faq details p { margin: 14px 0 0; color: var(--muted); }
.cta {
  width: min(1040px, calc(100% - 32px));
  margin: 120px auto;
  padding: 64px;
  text-align: center;
  background: var(--text);
  color: #fff;
  border-radius: 24px;
}
.cta p { color: #c9d0cb; }
.page-hero {
  width: min(920px, calc(100% - 32px));
  margin: 72px auto;
}
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 5.5rem); text-align: left; }
.page-hero p { color: var(--muted); font-size: 1.2rem; max-width: 760px; }
.content { width: min(920px, calc(100% - 32px)); margin: 0 auto 120px; }
.content section { margin: 72px 0; scroll-margin-top: 24px; }
.content h2 { font-size: clamp(1.8rem, 3.5vw, 3rem); }
.content h3 { margin-top: 32px; }
.content p, .content li { color: var(--muted); }
.content ul, .content ol { padding-left: 22px; }
.content pre { background: var(--code); color: #e8eee9; border-radius: 14px; padding: 22px; overflow-x: auto; }
.notice { padding: 20px 22px; border-radius: 14px; background: var(--accent-soft); border: 1px solid #b9d0c1; }
.verified { margin: -8px 0 20px; font-size: 0.85rem; color: var(--muted); }
.notice p { margin: 0 0 10px; }
.notice p:last-child { margin-bottom: 0; }
.step-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 0 0 18px; }
.step-actions code { color: var(--text); }
.pattern-list { display: grid; gap: 14px; }
.pattern-item { padding: 22px; border: 1px solid var(--line); background: var(--surface); border-radius: 14px; }
.pattern-item strong { display: block; margin-bottom: 8px; }
footer {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 44px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}
footer p { margin: 0; color: var(--muted); }
footer div { display: flex; flex-wrap: wrap; gap: 18px; }
@media (max-width: 900px) {
  .platform-actions { grid-template-columns: 1fr 1fr; }
  .platform-button, .platform-button:nth-child(4), .platform-button:nth-child(5) { grid-column: span 1; }
  .platform-button:last-child { grid-column: 1 / -1; }
  .proof-strip { grid-template-columns: 1fr 1fr; }
  .proof-strip div:nth-child(2) { border-right: 0; }
  .proof-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .card-grid { grid-template-columns: 1fr 1fr; }
  .split, .comparison { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .site-header { align-items: flex-start; }
  nav { justify-content: flex-end; gap: 12px; font-size: 0.9rem; }
  nav a:first-child, nav a:nth-child(2) { display: none; }
  .hero { margin-top: 48px; }
  .platform-actions { grid-template-columns: 1fr; }
  .platform-button, .platform-button:nth-child(4), .platform-button:nth-child(5), .platform-button:last-child { grid-column: span 1; }
  .proof-strip, .card-grid { grid-template-columns: 1fr; }
  .proof-strip div { border-right: 0; border-bottom: 1px solid var(--line); }
  .proof-strip div:last-child { border-bottom: 0; }
  .section { margin: 88px auto; }
  .cta { padding: 44px 24px; margin: 88px auto; }
  footer { align-items: flex-start; flex-direction: column; }
}