:root {
  color-scheme: light;
  --ink: #17211d;
  --muted: #5d6a64;
  --line: #dbe3df;
  --paper: #fbfcfb;
  --soft: #f1f6f3;
  --accent: #176b50;
  --accent-dark: #0e4c38;
}

* { box-sizing: border-box; }

html { background: var(--soft); }

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #edf6f1 0, var(--paper) 280px);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  line-height: 1.68;
}

a { color: var(--accent-dark); overflow-wrap: anywhere; }
a:hover { color: var(--accent); }

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  padding: 28px 0 20px;
  border-bottom: 1px solid rgba(23, 107, 80, 0.15);
}

.brand {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 760;
  text-decoration: none;
}

nav { float: right; }
nav a { margin-left: 18px; font-size: 0.92rem; }

main {
  min-width: 0;
  margin: 54px auto 80px;
  padding: clamp(28px, 5vw, 58px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 22px 70px rgba(21, 57, 44, 0.08);
}

h1, h2, h3 { line-height: 1.22; }
h1 { margin-top: 0; font-size: clamp(2rem, 5vw, 3.35rem); letter-spacing: -0.035em; }
h2 { margin-top: 2.4em; padding-top: 0.4em; border-top: 1px solid var(--line); }
h3 { margin-top: 2em; }
p, li { max-width: 75ch; overflow-wrap: anywhere; }
code { overflow-wrap: anywhere; word-break: break-word; }
.lede { color: var(--muted); font-size: 1.08rem; }
.meta { color: var(--muted); font-size: 0.9rem; }

.card {
  min-width: 0;
  margin: 22px 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--soft);
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border-radius: 12px;
  color: #eaf7f1;
  background: #15382c;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  font: 0.84rem/1.58 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.download {
  display: inline-block;
  margin: 4px 10px 4px 0;
  padding: 9px 13px;
  border-radius: 9px;
  color: white;
  background: var(--accent-dark);
  text-decoration: none;
}

footer {
  padding: 0 0 42px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 620px) {
  nav { float: none; margin-top: 10px; }
  nav a { margin: 0 14px 0 0; }
  main { margin-top: 30px; padding: 24px 20px; border-radius: 16px; }
}