* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; color: #222; background: #f5f6f8; line-height: 1.6; }
.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }
a { color: #1a56db; text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar { background: #fff; border-bottom: 1px solid #e5e7eb; position: sticky; top: 0; z-index: 10; }
.nav { display: flex; align-items: center; flex-wrap: wrap; padding: 10px 0; gap: 8px; }
.brand { font-size: 20px; font-weight: 700; color: #111; }
.nav-links { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-left: 12px; }
.nav-links a { color: #374151; }
.user { margin-left: auto; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.uname { color: #6b7280; }
.badge { background: #dc2626; color: #fff; border-radius: 10px; padding: 0 6px; font-size: 12px; }
.nav-toggle { display: none; }
.nav-burger { display: none; }

main { padding: 20px 0 40px; min-height: 70vh; }
h1 { font-size: 24px; margin-bottom: 16px; }
h2 { font-size: 20px; margin: 20px 0 10px; }
h3 { font-size: 17px; margin-bottom: 6px; }
p { margin-bottom: 8px; }
.card { background: #fff; border: 1px solid #e5e7eb; border-radius: 8px; padding: 16px; margin-bottom: 12px; }
.meta { color: #6b7280; font-size: 13px; }
.tag { display: inline-block; background: #eef2ff; color: #1a56db; border-radius: 4px; padding: 2px 8px; font-size: 12px; margin: 0 6px 4px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.btn { display: inline-block; background: #1a56db; color: #fff; padding: 8px 16px; border-radius: 6px; border: none; cursor: pointer; font-size: 14px; }
.btn:hover { background: #1e40af; text-decoration: none; }
.btn-ghost { background: #fff; color: #1a56db; border: 1px solid #1a56db; }
.btn-ghost:hover { background: #eef2ff; }
input, textarea, select { width: 100%; padding: 8px 10px; border: 1px solid #d1d5db; border-radius: 6px; font-size: 14px; margin-bottom: 12px; }
label { font-size: 14px; color: #374151; display: block; margin-bottom: 4px; }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 12px; }
.flash-ok { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.flash-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.footer { color: #9ca3af; font-size: 13px; text-align: center; padding: 20px 0; }
.search { max-width: 360px; }
.reply { border-left: 3px solid #e5e7eb; padding-left: 12px; margin: 10px 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid #e5e7eb; font-size: 14px; vertical-align: top; }

@media (max-width: 720px) {
  .nav-links, .user { display: none; }
  .nav-toggle:checked ~ .nav-links { display: flex; flex-direction: column; width: 100%; }
  .nav-toggle:checked ~ .user { display: flex; width: 100%; }
  .nav-burger { display: inline-block; margin-left: auto; cursor: pointer; padding: 4px 10px; border: 1px solid #d1d5db; border-radius: 6px; color: #374151; }
}