*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ---- Header ---- */
.site-header {
  background: linear-gradient(135deg, #1a3a5c 0%, #2563a8 100%);
  color: #fff;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
  flex-wrap: wrap;
}
.site-header h1 { font-size: 1.35rem; font-weight: 700; letter-spacing: .05em; }
.site-header p  { font-size: .8rem; opacity: .75; margin-top: 2px; }
.header-back {
  font-size: .85rem;
  opacity: .85;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 6px;
  transition: background .15s;
  white-space: nowrap;
}
.header-back:hover { background: rgba(255,255,255,.12); }

/* ---- Layout ---- */
.page-main {
  max-width: 1600px;
  margin: 0 auto;
  padding: 20px 24px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 7px;
  border: none;
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  transition: all .15s;
  font-family: inherit;
}
.btn-primary  { background: #2563a8; color: #fff; }
.btn-primary:hover  { background: #1a4f8c; }
.btn-success  { background: #16a34a; color: #fff; }
.btn-success:hover  { background: #14853d; }
.btn-outline  { background: #fff; color: #2563a8; border: 1.5px solid #2563a8; }
.btn-outline:hover  { background: #eff6ff; }
.btn-danger   { background: #dc2626; color: #fff; }
.btn-danger:hover   { background: #b91c1c; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* ---- Panel ---- */
.panel {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.panel-header {
  padding: 12px 18px 10px;
  border-bottom: 1px solid #eaecf0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.panel-header h2 { font-size: 1rem; font-weight: 600; color: #1a3a5c; }
.panel-body {
  flex: 1;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat-badge {
  font-size: .82rem;
  color: #555;
  background: #f0f2f5;
  border-radius: 20px;
  padding: 4px 12px;
  border: 1px solid #d0d7e3;
}

/* ---- Portal ---- */
.portal-intro {
  margin-bottom: 24px;
  color: #555;
  font-size: .92rem;
  line-height: 1.7;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}
.tool-card {
  background: #fff;
  border-radius: 10px;
  padding: 22px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  border: 1px solid #eaecf0;
  transition: box-shadow .15s, border-color .15s, transform .15s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tool-card:hover {
  box-shadow: 0 4px 16px rgba(37,99,168,.15);
  border-color: #2563a8;
  transform: translateY(-2px);
}
.tool-card h3 { font-size: 1.05rem; color: #1a3a5c; }
.tool-card p  { font-size: .85rem; color: #666; line-height: 1.6; flex: 1; }
.tool-card .tag {
  display: inline-block;
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: #eff6ff;
  color: #2563a8;
  font-weight: 600;
}
.tool-card .btn { align-self: flex-start; margin-top: 4px; }

.site-footer {
  text-align: center;
  padding: 28px 20px;
  font-size: .78rem;
  color: #999;
}