/* publicgoodsgame.com -- shared styles (mobile first, WeChat-friendly) */
:root {
  --bg: #f4f5f7; --card: #fff; --text: #1f2328; --muted: #6b7280; --line: #e5e7eb;
  --green: #1a7f4b; --rust: #b3471d; --blue: #1a4f9c;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16181c; --card: #1f2227; --text: #e6e6e6; --muted: #9aa0a6; --line: #2e3238;
          --green: #3fb27f; --rust: #e0754a; --blue: #6ea0ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.6;
       font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header { background: var(--card); border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 54px; gap: 12px; }
.brand { font-weight: 700; font-size: 17px; color: var(--text); white-space: nowrap; }
.brand span { color: var(--green); }
nav a { margin-left: 14px; color: var(--muted); font-size: 15px; }
nav a.on { color: var(--text); font-weight: 600; }

.hero { padding: 36px 0 20px; }
.hero h1 { font-size: 28px; margin: 0 0 8px; }
.hero p { color: var(--muted); margin: 0; }
.formula { display: inline-block; margin-top: 14px; padding: 6px 12px; border-radius: 8px;
           background: var(--card); border: 1px solid var(--line); font-size: 15px; }

.sections { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 18px 0 40px; }
@media (max-width: 700px) { .sections { grid-template-columns: 1fr; } }
.tile { display: block; background: var(--card); border-radius: 12px; padding: 18px;
        border-top: 4px solid var(--blue); box-shadow: 0 1px 3px rgba(0,0,0,.08); color: var(--text); }
.tile:hover { text-decoration: none; transform: translateY(-1px); }
.tile.read { border-top-color: var(--green); } .tile.exp { border-top-color: var(--rust); }
.tile h2 { margin: 0 0 4px; font-size: 20px; }
.tile p { margin: 0; color: var(--muted); font-size: 14px; }

.page-title { padding: 26px 0 6px; }
.page-title h1 { margin: 0; font-size: 24px; }
.page-title p { margin: 4px 0 0; color: var(--muted); }
.list { margin: 14px 0 40px; }
.item { background: var(--card); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px;
        box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.item h3 { margin: 0 0 4px; font-size: 17px; }
.item .meta { color: var(--muted); font-size: 14px; }
.item p { margin: 6px 0 0; font-size: 15px; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 10px; margin-right: 6px;
       background: var(--bg); border: 1px solid var(--line); color: var(--muted); }
.btn { display: inline-block; margin-top: 10px; padding: 9px 16px; border-radius: 9px;
       background: var(--green); color: #fff; font-weight: 600; }
.btn:hover { text-decoration: none; opacity: .9; }
.item.soon { opacity: .6; }
h2.group { font-size: 16px; color: var(--muted); margin: 22px 0 8px; font-weight: 600; }

footer { color: var(--muted); font-size: 13px; text-align: center; padding: 20px 0 30px; }