/* 虾助理 · 全站公共样式（导航 / 页脚 / 提示条） */
:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-soft: #eef2ff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f6f8fc;
  --radius: 16px;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: .65rem 20px;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--brand);
  letter-spacing: -.01em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  white-space: nowrap;
}

.brand .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .14);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: .15rem;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  color: #334155;
  text-decoration: none;
  font-size: .92rem;
  padding: .42rem .68rem;
  border-radius: 9px;
  transition: background .15s, color .15s;
  white-space: nowrap;
}

.nav-links a:hover { background: var(--brand-soft); color: var(--brand); }
.nav-links a.active { background: var(--brand); color: #fff; }

.nav-spacer { flex: 1 1 auto; }

.nav-user {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-size: .9rem;
  color: var(--muted);
}

.nav-user a { color: #334155; text-decoration: none; padding: .35rem .55rem; border-radius: 8px; }
.nav-user a:hover { background: var(--brand-soft); color: var(--brand); }
.nav-user .signin { border: 1px solid var(--line); font-weight: 600; color: var(--brand); }

.nav-badge {
  display: inline-block;
  background: #ef4444;
  color: #fff;
  border-radius: 999px;
  font-size: .68rem;
  line-height: 1.35;
  padding: 0 .38rem;
  min-width: 1.05rem;
  text-align: center;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding: 2.2rem 20px;
  color: var(--muted);
  font-size: .85rem;
  text-align: center;
  background: #fff;
}

.site-footer .foot-links { margin-bottom: .6rem; }
.site-footer a { color: #475569; text-decoration: none; margin: 0 .55rem; }
.site-footer a:hover { color: var(--brand); }

.toast-success, .toast-error {
  position: fixed;
  top: 78px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 500;
  z-index: 1001;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .18);
  max-width: 90vw;
}

.toast-success { background: #10b981; }
.toast-error { background: #ef4444; }

@media (max-width: 720px) {
  .site-nav .nav-inner { padding: .55rem 14px; gap: .4rem; }
  .nav-links { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .nav-links a { padding: .4rem .55rem; font-size: .88rem; }
  .nav-user { font-size: .85rem; }
}