:root {
  --ink: #1a2332;
  --accent: #2f7d5d;
  --accent-light: #e8f4ee;
  --muted: #5b6675;
  --bg: #fafbfc;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

nav { border-bottom: 1px solid #e5e9ee; background: #fff; }
nav .wrap { display: flex; align-items: center; gap: 20px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
nav .brand { font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); text-decoration: none; margin-right: auto; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--ink); }
nav .nav-btn { background: var(--accent); color: #fff; font-weight: 600; padding: 7px 16px; border-radius: 999px; }
nav .nav-btn:hover { color: #fff; opacity: 0.9; }

header.hero { padding: 96px 0 64px; text-align: center; }
.logo { font-size: 1.1rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: 32px; }
h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); line-height: 1.15; margin-bottom: 20px; }
.sub { font-size: 1.15rem; color: var(--muted); max-width: 540px; margin: 0 auto; }

.features { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); padding: 32px 0 64px; }
.card { background: #fff; border: 1px solid #e5e9ee; border-radius: 12px; padding: 24px; }
.card .emoji { font-size: 1.6rem; }
.card h3 { font-size: 1rem; margin: 10px 0 6px; }
.card p { font-size: 0.92rem; color: var(--muted); }
.cta { text-align: center; padding: 0 0 72px; }
.badge { display: inline-block; background: var(--accent-light); color: var(--accent); font-weight: 600; font-size: 0.9rem; padding: 10px 22px; border-radius: 999px; }
.btn { display: inline-block; background: var(--accent); color: #fff; font-weight: 700; font-size: 1.05rem; padding: 14px 30px; border-radius: 999px; text-decoration: none; }

article { padding: 56px 0 72px; }
article h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: 8px; }
article .intro { color: var(--muted); font-size: 1.1rem; margin-bottom: 36px; }
article h2 { font-size: 1.25rem; margin: 36px 0 10px; }
article p { margin-bottom: 14px; }
article ul, article ol { margin: 0 0 14px 22px; }
article li { margin-bottom: 6px; }
article table { border-collapse: collapse; width: 100%; margin: 14px 0 20px; font-size: 0.95rem; background: #fff; }
article th, article td { border: 1px solid #e5e9ee; padding: 9px 12px; text-align: left; }
article th { background: var(--accent-light); color: var(--ink); }
article .tip { background: var(--accent-light); border-radius: 10px; padding: 14px 18px; margin: 18px 0; }
article a { color: var(--accent); }
.table-scroll { overflow-x: auto; }

footer { border-top: 1px solid #e5e9ee; padding: 28px 0 40px; font-size: 0.85rem; color: var(--muted); text-align: center; }
footer a { color: var(--muted); }