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

html, body {
  height: 100%;
  font-family: "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: #f0f2f7;
  color: #1e293b;
}

/* ── top bar ── */

.topbar {
  height: 56px;
  background: #1e293b;
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

.topbar .brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .5px;
}

.topbar .spacer { flex: 1; }

.topbar .user-info {
  font-size: 14px;
  opacity: .85;
}

.topbar button {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: background .15s;
}

.topbar button:hover { background: rgba(255,255,255,.22); }

/* ── cards ── */

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(15,23,42,.06);
  padding: 28px 32px;
}

/* ── form elements ── */

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: #475569;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid #cbd5e1;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}

.form-group input:focus {
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .1s;
}

.btn:active { transform: scale(.97); }

.btn-primary {
  background: #4f46e5;
  color: #fff;
}

.btn-primary:hover { background: #4338ca; }

.btn-danger {
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.btn-danger:hover { background: #fecaca; }

.btn-ghost {
  background: transparent;
  color: #4f46e5;
}

.btn-ghost:hover { background: #eef2ff; }

/* ── alert ── */

.alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.alert.error {
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
  display: block;
}

.alert.success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
  display: block;
}