:root {
  --paper: #FAFAF9;
  --ink: #1C1917;
  --ink-soft: #44403C;
  --muted: #78716C;
  --faint: #A8A29E;
  --border: #EAE7E1;
  --tint: #F4F1EC;
  --orange: #FF4F00;
  --orange-dark: #E84600;
  --serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 100;
}
.skip:focus { left: 8px; top: 8px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.serif { font-family: var(--serif); font-weight: 400; }

.kicker {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--orange);
  margin: 0 0 16px;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 249, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-family: var(--serif); font-size: 23px; text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { text-decoration: none; color: var(--ink-soft); font-size: 15px; }
.nav-links a:hover { color: var(--orange); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 8px;
  padding: 13px 22px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); }
.btn-ghost { background: transparent; color: var(--ink); border-color: #D6D3CD; }
.btn-ghost:hover { border-color: var(--ink); }
.btn-sm { padding: 8px 16px; font-size: 14px; border-radius: 20px; }
.btn-dark { background: var(--ink); color: var(--paper); }

/* hero */
.hero { padding: 84px 0 72px; }
.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.04;
  margin: 0;
  max-width: 13ch;
}
.hero .lede {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 24px 0 32px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.cta-note { font-size: 14px; color: var(--faint); margin-top: 18px; }

/* bands */
.band { padding: 64px 0; }
.band-tint { background: var(--tint); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.band h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
  margin: 0 0 14px;
}
.band p.intro { font-size: 18px; color: var(--ink-soft); max-width: 60ch; margin: 0; }

/* method steps */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-top: 36px;
}
.step {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 18px;
}
.step .num { font-family: var(--serif); font-size: 30px; color: var(--orange); line-height: 1; }
.step .name { font-size: 16px; font-weight: 500; margin-top: 10px; }
.step .desc { font-size: 14px; color: var(--muted); margin-top: 4px; }

/* two cards */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 8px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}
.card-head { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.card-head i { font-size: 22px; color: var(--orange); }
.card-head h3 { font-family: var(--serif); font-weight: 400; font-size: 26px; margin: 0; }
.card ul { list-style: none; margin: 0; padding: 0; }
.card li { display: flex; gap: 10px; align-items: flex-start; padding: 7px 0; font-size: 15.5px; color: var(--ink-soft); }
.card li i { color: var(--orange); font-size: 18px; margin-top: 2px; flex: none; }

/* mcp band */
.mcp { background: var(--ink); color: var(--paper); }
.mcp .kicker { color: #FF7A45; }
.mcp h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(30px, 4.5vw, 46px); line-height: 1.08; margin: 0; max-width: 18ch; }
.mcp p { font-size: 18px; color: #CFC9C0; max-width: 60ch; margin: 18px 0 0; }

/* author */
.author { display: grid; grid-template-columns: 120px 1fr; gap: 28px; align-items: start; }
.author .avatar {
  width: 120px; height: 120px; border-radius: 50%;
  background: var(--tint); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 40px; color: var(--orange);
}
.author h2 { font-family: var(--serif); font-weight: 400; font-size: 30px; margin: 0 0 12px; }
.author p { font-size: 16.5px; color: var(--ink-soft); margin: 0 0 12px; max-width: 64ch; }

/* signup */
.signup { text-align: center; }
.signup h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(30px, 4.5vw, 44px); margin: 0 0 12px; }
.signup p.sub { font-size: 18px; color: var(--ink-soft); max-width: 52ch; margin: 0 auto 26px; }
.signup form { display: flex; gap: 10px; max-width: 480px; margin: 0 auto; }
.signup input {
  flex: 1; background: #fff; border: 1px solid #D6D3CD; border-radius: 8px;
  padding: 14px 16px; font-size: 16px; font-family: var(--sans); color: var(--ink);
}
.signup input:focus { outline: none; border-color: var(--orange); box-shadow: 0 0 0 3px rgba(255,79,0,0.12); }
.signup button { white-space: nowrap; }
.signup .msg { font-size: 15px; color: var(--ink-soft); margin-top: 16px; min-height: 22px; }
.signup .msg a { color: var(--orange); }

/* footer */
.footer { border-top: 1px solid var(--border); background: var(--tint); padding: 28px 0; }
.footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.footer, .footer a { font-size: 14px; color: var(--muted); }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--orange); }
.footer .links { display: flex; gap: 18px; align-items: center; }

/* responsive */
@media (max-width: 860px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .cards { grid-template-columns: 1fr; }
  .author { grid-template-columns: 1fr; }
  .author .avatar { width: 84px; height: 84px; font-size: 30px; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .nav-links a { display: none; }
  .nav-links .btn { display: inline-flex; }
  .hero { padding: 56px 0 48px; }
  .steps { grid-template-columns: 1fr 1fr; }
  .signup form { flex-direction: column; }
}