:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  background: #f4efe8;
  color: #2b2521;
}

* { box-sizing: border-box; }

body { margin: 0; }

.shell {
  width: min(820px, calc(100% - 32px));
  margin: 32px auto;
}

header, main, footer {
  border: 1px solid #e4d8cb;
  background: #fffaf4;
}

header {
  padding: 28px 32px;
  border-radius: 26px 26px 0 0;
  background: linear-gradient(145deg, #244b42, #376d5f);
  color: #fffaf4;
}

.brand {
  margin: 0;
  font-size: clamp(1.8rem, 6vw, 2.7rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.tagline { margin: 0.5rem 0 0; color: #e7f1ec; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1rem;
  margin-top: 1.25rem;
}

nav a, .pill {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

main { padding: 30px 32px 36px; }

footer {
  padding: 18px 32px;
  border-top: 0;
  border-radius: 0 0 26px 26px;
  color: #6f6258;
  font-size: 0.92rem;
}

h1, h2, h3 { line-height: 1.25; }
h1 { margin: 0 0 0.6rem; font-size: 1.75rem; }
h2 { margin: 2.1rem 0 0.55rem; font-size: 1.18rem; }
h3 { margin: 1.35rem 0 0.35rem; font-size: 1rem; }
p, ul { margin-top: 0.65rem; }
li + li { margin-top: 0.3rem; }
a { color: #a64d22; }
.meta { color: #76685f; font-size: 0.92rem; }
.lead { font-size: 1.08rem; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 1.5rem 0; }
.card { padding: 18px; border: 1px solid #e6d7c9; border-radius: 18px; background: #fffdf9; }
.card h2 { margin: 0 0 0.4rem; }
.notice { padding: 14px 16px; border-left: 4px solid #d9824b; background: #fbefe5; border-radius: 8px; }

@media (max-width: 620px) {
  :root { font-size: 16px; }
  .shell { width: min(100% - 20px, 820px); margin: 10px auto; }
  header, main, footer { padding-left: 20px; padding-right: 20px; }
  .cards { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root { background: #171411; color: #f3e9df; }
  header { border-color: #466a61; background: linear-gradient(145deg, #173c34, #28584d); }
  main, footer { border-color: #463b34; background: #241e1a; }
  footer, .meta { color: #c5b7ab; }
  .card { border-color: #4c3f37; background: #2b241f; }
  .notice { background: #3a2a20; }
  a { color: #f2aa77; }
}