* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  color: #e8eef2;
  display: flex; flex-direction: column; min-height: 100vh;
}
main {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 48px 24px; text-align: center;
}
.hero .avatar {
  width: 88px; height: 88px; border-radius: 50%;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 36px; margin: 0 auto 28px;
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
}
h1 { font-size: 32px; font-weight: 600; letter-spacing: 6px; margin-bottom: 14px; }
.sub { font-size: 15px; color: #9fb3c8; letter-spacing: 2px; margin-bottom: 44px; }
.panel {
  width: 100%; max-width: 460px;
  padding: 32px 30px; border-radius: 16px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 12px 40px rgba(0,0,0,.35);
}
.intro { text-align: left; margin-bottom: 26px; }
.intro p { font-size: 14px; color: #c3d2df; line-height: 1.8; margin-bottom: 14px; }
.features { list-style: none; }
.features li { font-size: 13px; color: #9fb3c8; line-height: 2; }
.field { margin-bottom: 16px; text-align: left; }
.field label { display: block; font-size: 13px; color: #9fb3c8; margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 14px; border-radius: 10px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(0,0,0,.25); color: #e8eef2; font-size: 15px;
  outline: none; transition: border-color .2s;
}
.field input:focus { border-color: #5ba8d9; }
.msg { font-size: 13px; color: #ff9f9f; min-height: 18px; margin-bottom: 10px; }
button {
  width: 100%; padding: 12px; border: none; border-radius: 10px;
  background: linear-gradient(135deg, #3e8fb0, #2c5364);
  color: #fff; font-size: 16px; letter-spacing: 4px; cursor: pointer;
  transition: opacity .2s;
}
button:hover { opacity: .88; }
button:disabled { opacity: .4; cursor: not-allowed; }
button.ghost {
  margin-top: 24px; background: transparent;
  border: 1px solid rgba(255,255,255,.25); letter-spacing: 2px; font-size: 14px;
}
.welcome { font-size: 15px; color: #c3d2df; margin-bottom: 24px; }
.welcome span { color: #7fc4e8; }
.cards { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.card {
  width: 180px; padding: 24px 18px; border-radius: 14px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  text-decoration: none; color: #e8eef2;
  transition: transform .25s ease, background .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-6px); background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.3); }
.card .icon { font-size: 28px; margin-bottom: 12px; }
.card .name { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.card .desc { font-size: 12px; color: #9fb3c8; line-height: 1.6; }
.hidden { display: none !important; }
footer {
  padding: 22px 16px; text-align: center; font-size: 13px; color: #7a8fa4;
  border-top: 1px solid rgba(255,255,255,.08);
}
footer a { color: #9fb3c8; text-decoration: none; }
footer a:hover { color: #e8eef2; }
footer .sep { margin: 0 10px; color: #4a5f73; }
@media (max-width: 560px) {
  h1 { font-size: 26px; letter-spacing: 3px; }
  .sub { margin-bottom: 32px; }
  .card { width: 100%; max-width: 300px; }
}