* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f2f3f5; color: #1d2129; }
.login { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; background: #fff; border-radius: 8px; padding: 32px 28px; box-shadow: 0 4px 16px rgba(0, 0, 0, .06); }
.login-card h1 { margin: 0 0 24px; font-size: 22px; text-align: center; }
.login-card label { display: block; margin-bottom: 16px; font-size: 14px; color: #4e5969; }
.login-card input { display: block; width: 100%; margin-top: 6px; padding: 9px 12px; border: 1px solid #c9cdd4; border-radius: 4px; font-size: 14px; }
.login-card input:focus { outline: none; border-color: #165dff; }
.login-card button { width: 100%; padding: 10px; border: 0; border-radius: 4px; background: #165dff; color: #fff; font-size: 15px; cursor: pointer; }
.error { margin: 0 0 16px; padding: 8px 12px; border-radius: 4px; background: #ffece8; color: #cb2634; font-size: 13px; }
.placeholder { max-width: 560px; margin: 80px auto; padding: 0 16px; line-height: 1.7; }
.placeholder form { margin-top: 24px; }
.placeholder button { padding: 6px 16px; border: 1px solid #c9cdd4; border-radius: 4px; background: #fff; cursor: pointer; }