html, body {
    height: 100%;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.admin-login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.admin-login-card {
    width: 100%;
    max-width: 1080px;
    min-height: 620px;
    border-radius: 24px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 24px 80px rgba(0,0,0,.28);
    display: grid;
    grid-template-columns: 1.1fr .9fr;
}

.admin-login-left {
    background: linear-gradient(160deg, #111827 0%, #1f2937 100%);
    color: #fff;
    padding: 56px 52px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.admin-login-brand {
    font-size: 34px;
    font-weight: 800;
    letter-spacing: 1px;
}

.admin-login-subtitle {
    font-size: 18px;
    line-height: 1.8;
    color: rgba(255,255,255,.82);
    margin-top: 18px;
    max-width: 480px;
}

.admin-login-features {
    margin-top: 48px;
}

    .admin-login-features .item {
        background: rgba(255,255,255,.08);
        border: 1px solid rgba(255,255,255,.08);
        border-radius: 18px;
        padding: 18px 20px;
        margin-bottom: 16px;
    }

    .admin-login-features .item-title {
        font-weight: 700;
        margin-bottom: 6px;
    }

.admin-login-right {
    padding: 64px 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
}

.admin-login-form {
    width: 100%;
    max-width: 360px;
}

    .admin-login-form h2 {
        font-weight: 800;
        margin-bottom: 8px;
        color: #111827;
    }

    .admin-login-form p {
        color: #6b7280;
        margin-bottom: 28px;
    }

.form-control {
    height: 52px;
    border-radius: 14px;
    border: 1px solid #d1d5db;
    padding-left: 16px;
}

.btn-admin-login {
    height: 52px;
    border-radius: 14px;
    font-weight: 700;
    font-size: 16px;
    background: #111827;
    border-color: #111827;
}

    .btn-admin-login:hover {
        background: #0b1220;
        border-color: #0b1220;
    }

.admin-footer-note {
    margin-top: 24px;
    font-size: 13px;
    color: #9ca3af;
    line-height: 1.7;
}

.validation-summary-errors ul {
    margin-bottom: 0;
}

/* 手机端登录页适配：说明在上，登录表单在下 */
@media (max-width: 768px) {
    html,
    body {
        height: auto;
        min-height: 100%;
        overflow-x: hidden;
    }

    .admin-login-shell {
        min-height: 100vh;
        padding: 16px;
        align-items: flex-start;
        justify-content: center;
    }

    .admin-login-card {
        width: 100%;
        max-width: 420px;
        min-height: auto;
        display: grid;
        grid-template-columns: 1fr;
        border-radius: 22px;
        overflow: hidden;
    }

    /* 手机端：说明内容放上面 */
    .admin-login-left {
        order: 1;
        padding: 32px 24px;
        display: block;
        background: linear-gradient(160deg, #111827 0%, #1f2937 100%);
    }

    /* 手机端：登录表单放下面 */
    .admin-login-right {
        order: 2;
        padding: 36px 24px 32px;
        display: block;
        background: #ffffff;
    }

    .admin-login-form {
        width: 100%;
        max-width: 100%;
    }

    .admin-login-brand {
        font-size: 28px;
        line-height: 1.3;
    }

    .admin-login-subtitle {
        font-size: 15px;
        line-height: 1.9;
        margin-top: 16px;
    }

    .admin-login-features {
        margin-top: 28px;
    }

        .admin-login-features .item {
            padding: 16px;
            margin-bottom: 14px;
            border-radius: 16px;
        }

        .admin-login-features .item-title {
            font-size: 15px;
        }

        .admin-login-features .item div:last-child {
            font-size: 14px;
            line-height: 1.7;
        }

    .admin-login-form h2 {
        font-size: 26px;
    }

    .admin-login-form p {
        margin-bottom: 24px;
    }

    .admin-footer-note {
        margin-top: 20px;
        font-size: 12px;
    }
}