* { margin: 0; padding: 0; box-sizing: border-box; font-family: system-ui, -apple-system, "Microsoft YaHei", sans-serif; }
body {
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    min-height: 100vh; min-height: 100dvh;
    display: flex; align-items: center; justify-content: center;
    padding: 12px;
}
.login-card {
    background: rgba(255,255,255,0.95); backdrop-filter: blur(20px);
    border-radius: 20px; padding: 32px 32px 28px;
    width: 400px; max-width: 100%;
    box-shadow: 0 25px 80px rgba(0,0,0,0.3);
    animation: slideUp 0.5s ease;
}
@keyframes slideUp { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }
.logo { text-align: center; margin-bottom: 20px; }
.logo i { font-size: 36px; color: #667eea; }
.logo h1 { font-size: 18px; color: #1a202c; margin-top: 4px; }
.logo p { font-size: 12px; color: #718096; margin-top: 2px; }
.tabs { display: flex; margin-bottom: 18px; border-bottom: 2px solid #e2e8f0; }
.tab-btn {
    flex: 1; padding: 8px; text-align: center; font-size: 14px; font-weight: 600;
    color: #a0aec0; cursor: pointer; border: none; background: none;
    border-bottom: 2px solid transparent; margin-bottom: -2px;
    transition: all 0.2s;
}
.tab-btn.active { color: #667eea; border-bottom-color: #667eea; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 12px; color: #4a5568; margin-bottom: 4px; font-weight: 500; }
.form-group input {
    width: 100%; padding: 10px 12px; border: 1px solid #e2e8f0; border-radius: 8px;
    font-size: 14px; transition: all 0.2s; outline: none;
}
.form-group input:focus { border-color: #667eea; box-shadow: 0 0 0 3px rgba(102,126,234,0.15); }
.submit-btn {
    width: 100%; padding: 11px; border: none; border-radius: 8px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff; font-size: 15px; font-weight: 600; cursor: pointer;
    transition: all 0.2s; margin-top: 4px;
}
.submit-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(102,126,234,0.4); }
.submit-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.error-msg { color: #e53e3e; font-size: 12px; text-align: center; margin-top: 6px; min-height: 18px; }
.qr-section { margin-top: 16px; padding-top: 14px; border-top: 1px solid #e2e8f0; text-align: center; }
.qr-btn {
    padding: 8px 20px; border: 1px solid #667eea; border-radius: 8px;
    background: white; color: #667eea; font-size: 13px; cursor: pointer;
    transition: all 0.2s;
}
.qr-btn:hover { background: #ebf4ff; }
@media (max-width: 420px) {
    body { padding: 8px; }
    .login-card { padding: 20px 16px 18px; border-radius: 16px; }
    .logo { margin-bottom: 14px; }
    .logo i { font-size: 28px; }
    .logo h1 { font-size: 16px; }
    .logo p { font-size: 11px; }
    .tabs { margin-bottom: 14px; }
    .tab-btn { padding: 6px; font-size: 13px; }
    .form-group { margin-bottom: 10px; }
    .form-group label { font-size: 11px; margin-bottom: 3px; }
    .form-group input { padding: 8px 10px; font-size: 13px; border-radius: 6px; }
    .submit-btn { padding: 9px; font-size: 14px; border-radius: 6px; }
}