.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #3b82f6 100%);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

.login-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 100px 100px;
    animation: gridMove 30s linear infinite reverse;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.login-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 40px 30px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,.2);
    border: 1px solid rgba(255,255,255,.3);
    position: relative;
    z-index: 1;
}

.login-card h3 {
    text-align: center;
    margin-bottom: 8px;
    color: #1e3a5f;
    font-size: 1.25rem;
}

/* 188mi 品牌标识 */
.brand-logo {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #6d28d9, #2563eb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.brand-logo .brand-suffix {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: #475569;
    -webkit-text-fill-color: #475569;
    margin-left: 6px;
    vertical-align: baseline;
}

.login-card .login-subtitle {
    text-align: center;
    color: #64748b;
    font-size: 0.85rem;
    margin-bottom: 30px;
}

.login-card .form-label {
    color: #334155;
    font-weight: 500;
}

.login-card .form-control {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #334155;
    border-radius: 8px;
}

.login-card .form-control:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
    background: #ffffff;
    color: #334155;
}

.login-card .btn-primary {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    border: none;
    color: #fff;
    border-radius: 8px;
    font-weight: 600;
    padding: 12px;
    transition: all .3s;
}

.login-card .btn-primary:hover {
    box-shadow: 0 4px 15px rgba(37,99,235,0.4);
    transform: translateY(-1px);
}

.login-card .alert-danger {
    background: rgba(239,68,68,0.08);
    border: 1px solid #ef4444;
    color: #ef4444;
    border-radius: 8px;
}

/* D2 登录验证码：输入框 + 可点击刷新的验证码图片 */
.login-captcha-wrap {
    display: flex;
    gap: 8px;
    align-items: center;
}

.login-captcha-wrap .form-control {
    flex: 1 1 auto;
    min-width: 0;
}

.login-captcha-img {
    flex: 0 0 auto;
    height: 38px;
    width: auto;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    cursor: pointer;
    background: #f8fafc;
}