:root {
  --bg: #ffffff;
  --surface: #f3f7f5;
  --text: #15201c;
  --muted: #55625d;
  --brand: #1f6f5c;
  --brand-ink: #ffffff;
  --border: #dbe4e0;
  --accent-bg: #e3f1ec;
  --max: 1080px;
  --prose: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1513;
    --surface: #17201d;
    --text: #e6eeea;
    --muted: #a3b1ab;
    --brand: #6cc7ad;
    --brand-ink: #062019;
    --border: #2a3632;
    --accent-bg: #1b2e28;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: var(--brand); }

img { max-width: 100%; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; color: var(--text); text-decoration: none; }
.logo-mark { width: 30px; height: 30px; border-radius: 9px; background: var(--brand); display: grid; place-items: center; color: var(--brand-ink); }
.logo-mark svg { width: 17px; height: 17px; }
.nav { display: flex; gap: 20px; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--text); }

/* Buttons */
.buttons { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 12px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1px solid var(--brand); }
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-secondary { color: var(--brand); background: transparent; }

/* Landing */
.hero { padding: 72px 0 56px; }
.hero h1 { font-size: clamp(34px, 6vw, 54px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 18px; max-width: 760px; }
.hero p { font-size: 20px; color: var(--muted); max-width: 620px; margin: 0 0 28px; }
.small { font-size: 14px; color: var(--muted); }

section { padding: 56px 0; }
section.alt { background: var(--surface); }
h2 { font-size: clamp(26px, 4vw, 34px); line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 12px; }
.lead { color: var(--muted); max-width: 640px; margin: 0 0 32px; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card { background: var(--bg); border: 1px solid var(--border); border-radius: 16px; padding: 22px; }
section.alt .card { background: var(--bg); }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.step-num { width: 32px; height: 32px; border-radius: 50%; background: var(--accent-bg); color: var(--brand); display: grid; place-items: center; font-weight: 700; margin-bottom: 12px; }

.price { font-size: 30px; font-weight: 700; margin: 6px 0 2px; }
.card.featured { border: 2px solid var(--brand); }
.tag { display: inline-block; background: var(--brand); color: var(--brand-ink); font-size: 12px; font-weight: 700; border-radius: 99px; padding: 2px 10px; }

.faq details { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { color: var(--muted); margin: 10px 0 0; }

/* Articles */
.article { max-width: var(--prose); margin: 0 auto; padding: 48px 20px 64px; }
.article h1 { font-size: clamp(30px, 5vw, 42px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 12px; }
.article h2 { font-size: 26px; margin: 40px 0 10px; }
.article h3 { font-size: 20px; margin: 28px 0 8px; }
.article .meta { color: var(--muted); font-size: 15px; margin-bottom: 28px; }
.article li { margin: 6px 0; }
.summary { background: var(--surface); border-left: 4px solid var(--brand); border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 24px 0; }
.summary p { margin: 0; }
.cta { background: var(--accent-bg); border-radius: 16px; padding: 24px; margin: 36px 0; }
.cta h2, .cta h3 { margin-top: 0; }
.cta p { margin: 0 0 16px; }
.related { border-top: 1px solid var(--border); margin-top: 48px; padding-top: 24px; }
.related ul { padding-left: 20px; }

.guide-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.guide-list a { display: block; padding: 20px; border: 1px solid var(--border); border-radius: 14px; text-decoration: none; color: var(--text); }
.guide-list a:hover { border-color: var(--brand); }
.guide-list strong { display: block; font-size: 18px; margin-bottom: 4px; }
.guide-list span { color: var(--muted); font-size: 15px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; justify-content: space-between; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--muted); }

@media (max-width: 560px) {
  .nav { gap: 14px; }
  .nav .hide-sm { display: none; }
  .hero { padding: 48px 0 40px; }
}