/* Margin product site — same language as the app: dark green mark,
   warm paper, editorial serif display, quiet sans body. */

:root {
  --paper: #eef1ee;
  --raised: #f8faf8;
  --ink: #18201d;
  --ink-soft: #4e5954;
  --ink-faint: #758079;
  --hairline: #d9ded9;
  --green: #163d32;
  --green-soft: #1c5e49;
  --mint: #e4eee8;
  --mint-line: #ccddd2;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: Georgia, "Times New Roman", serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: var(--green-soft); }

/* ——— nav ——— */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid var(--hairline);
  background: rgba(250, 251, 249, 0.9);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }

.mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--green);
  color: #f4f7f4;
  font-family: var(--serif);
  font-size: 17px;
}

.mark.small { width: 24px; height: 24px; font-size: 13px; border-radius: 7px; }

.tag {
  font-size: 11px;
  color: var(--ink-faint);
  background: #e8ece8;
  padding: 3px 7px;
  border-radius: 6px;
}

.nav nav { display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--ink-soft); text-decoration: none; font-size: 14px; }
.nav nav a:hover { color: var(--ink); }
.nav .github { font-weight: 600; color: var(--green); }

/* ——— hero ——— */

.hero {
  max-width: 880px;
  margin: 0 auto;
  padding: 88px 28px 40px;
  text-align: left;
}

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green-soft);
  margin-bottom: 18px;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  font-weight: 500;
  max-width: 20ch;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 56ch;
  margin-top: 22px;
}

.cta { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

.button {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 140ms ease-out, background-color 140ms ease-out;
}

.button:active { transform: scale(0.98); }

.button.primary { background: var(--green); color: #f4f7f4; }
.button.primary:hover { background: var(--green-soft); }

.button.ghost { border: 1px solid var(--hairline); color: var(--ink-soft); background: var(--raised); }
.button.ghost:hover { color: var(--ink); border-color: var(--ink-faint); }

.button.secondary { border: 1px solid var(--mint-line); background: var(--mint); color: var(--green); }
.button.secondary:hover { border-color: var(--green-soft); }

.shot { margin-top: 56px; }
.shot img {
  border: 1px solid var(--hairline);
  border-radius: 14px;
  box-shadow: 0 2px 4px rgba(24, 32, 29, 0.05), 0 24px 64px rgba(24, 32, 29, 0.1);
}
.shot figcaption {
  font-size: 13px;
  color: var(--ink-faint);
  margin-top: 12px;
}

/* ——— sections ——— */

section { max-width: 880px; margin: 0 auto; padding: 72px 28px 8px; }

h2 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
}

.steps { list-style: none; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  display: flex;
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--hairline);
}
.steps li::before {
  content: "0" counter(step);
  font-family: var(--serif);
  font-style: italic;
  color: var(--green-soft);
  font-size: 1.05rem;
  min-width: 32px;
}
.steps b { display: block; font-size: 1.02rem; }
.steps span { color: var(--ink-soft); font-size: 0.95rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px 32px;
}
.grid h3 { font-size: 1rem; margin-bottom: 6px; }
.grid p { font-size: 0.93rem; color: var(--ink-soft); }

.principles ul { padding-left: 20px; color: var(--ink-soft); }
.principles li { margin-bottom: 8px; }
.roadmap {
  margin-top: 24px;
  padding: 16px 18px;
  background: var(--mint);
  border: 1px solid var(--mint-line);
  border-radius: 12px;
  color: #174c3b;
  font-size: 0.95rem;
}

.download p { color: var(--ink-soft); max-width: 52ch; }
.platforms { display: flex; gap: 12px; margin: 26px 0 14px; flex-wrap: wrap; }
.src { font-size: 0.92rem; }

/* ——— footer ——— */

footer {
  margin-top: 88px;
  border-top: 1px solid var(--hairline);
  padding: 26px 28px 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-faint);
  font-size: 13px;
}
footer p { font-family: var(--serif); font-style: italic; }

@media (max-width: 640px) {
  .nav nav a:not(.github):not([href="#download"]) { display: none; }
  .hero { padding-top: 56px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}