:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #68727d;
  --line: #e5e8ec;
  --surface: #ffffff;
  --wash: #f5f7fa;
  --accent: #1f6feb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

.shell {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 40px;
}

.shell--narrow { width: min(680px, calc(100% - 32px)); }

article, .link-card, .support-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
}

article { padding: clamp(24px, 5vw, 54px); }

.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: .12em; }
h1 { margin: 0 0 12px; font-size: clamp(32px, 6vw, 48px); line-height: 1.2; letter-spacing: -.03em; }
h2 { margin: 2.2em 0 .7em; font-size: 23px; line-height: 1.35; }
h3 { margin: 1.5em 0 .35em; font-size: 18px; }
p { margin: .8em 0; }
li { margin: .35em 0; }
.lead { color: var(--muted); font-size: 19px; }
.date, .muted { color: var(--muted); font-size: 14px; }
.back-link { display: inline-block; margin-bottom: 20px; text-decoration: none; }

.link-grid { display: grid; gap: 14px; margin-top: 32px; }
.link-card { display: block; padding: 22px 24px; text-decoration: none; transition: border-color .15s, transform .15s; }
.link-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.link-card__title { display: block; color: var(--ink); font-size: 19px; font-weight: 700; }
.link-card__meta { display: block; color: var(--muted); font-size: 14px; }
.support-card { margin: 28px 0; padding: 8px 24px 20px; }

footer { padding: 24px 4px 0; color: var(--muted); font-size: 13px; }

@media (max-width: 560px) {
  .shell { padding-top: 32px; }
  article { border-radius: 14px; padding: 24px 20px; }
}